Pretransplant Comorbidities That Affect the Risk of Transplant-Related Mortality: Predictive Power of the Hematopoietic Cell Transplant–Specific Comorbidity Index

Because of the intensity of therapy associated with the transplant process, the pretransplant clinical status of recipients (e.g., age, presence of infections or organ dysfunction, and functional status) is associated with a risk of transplant-related mortality.

The best tool to assess the impact of pretransplant comorbidities on outcomes after transplant was developed by adapting an existing comorbidity scale, the Charlson Comorbidity Index (CCI). Investigators at the Fred Hutchinson Cancer Research Center systematically defined which of the CCI elements were correlated with transplant-related mortality in adult and pediatric patients. They also determined several additional comorbidities that have predictive power specific to transplant patients.

Successful validation defined what is now termed the hematopoietic cell transplant–specific comorbidity index (HCT-CI).[1,2] The rate of transplant-related mortality increases with the presence of cardiac, hepatic, pulmonary, gastrointestinal, infectious, and autoimmune comorbidities, or a history of previous solid tumors (see Table 1).

The predictive power of this index for both transplant-related mortality and overall survival (OS) is strong, with a hazard ratio of 3.54 (95% confidence interval [CI], 2.0–6.3) for nonrelapse mortality and 2.69 (95% CI, 1.8–4.1) for survival in patients with a score of 3 or higher, compared with those who have a score of 0. Although the original studies were performed with patients who received intense myeloablative approaches, the HCT-CI has also been shown to predict outcomes for patients receiving reduced-intensity and nonmyeloablative regimens.[3] It has also been combined with disease status [4] and Karnofsky score,[5] leading to even better prediction of survival outcomes. In addition, high HCT-CI scores (>3) have been associated with a higher risk of grades III to IV acute graft-versus-host disease.[6]

Most patients assessed in the HCT-CI studies have been adults, and the comorbidities listed are skewed toward adult diseases. Several studies have explored the relevance of this scale for pediatric and young adult recipients of hematopoietic stem cell transplant (HSCT).

Evidence (use of HCT-CI score in pediatrics):

1. A retrospective cohort study was conducted at four large centers of pediatric patients (median age, 6 years) with a wide variety of both malignant and nonmalignant disorders.[7]
   1. The HCT-CI was predictive of both nonrelapse mortality and survival.
   2. The 1-year nonrelapse mortality rates were:
      • 10% for patients with scores of 0.
      • 14% for patients with scores of 1 to 2.
      • 28% for patients with scores of 3 or higher.
   3. The 1-year OS rates were:
      • 88% for patients with scores of 0.
      • 67% for patients with scores of 1 to 2.
      • 62% for patients with scores of 3 or higher.
2. A second study included young adults (aged 16–39 years) and demonstrated the following:[8]
   • Similar increases in mortality with higher HCT-CI scores.
   • The nonrelapse mortality rates were 24% for patients with scores of 0 to 2 and 38% for patients with scores of 3 or higher.
   • The OS rates were 46% for patients with scores of 0 to 2 and 28% for patients with scores of 3 or higher.
3. A prospective validation of the HCT-CI through the Center for International Blood and Marrow Transplant Research included 23,876 patients, 1,755 of whom were children, who underwent transplant between 2007 and 2009. Patients' HCT-CI scores and outcomes were tracked.[9]
   • Although adults treated with myeloablative regimens had increased mortality rates with HCT-CI scores of 1 or 2, pediatric patients did not have increased mortality rates until a score of 3 or higher was noted.

Most of the reported comorbidities in these studies were respiratory or hepatic conditions and infections.[7,8] In the adolescent and young adult study, patients with pre-HSCT pulmonary dysfunction were at particularly higher risk of poor outcomes, with a 2-year OS rate of 29%, compared with 61% in those with normal lung function before HSCT.[8]

References:

1. Sorror ML, Maris MB, Storb R, et al.: Hematopoietic cell transplantation (HCT)-specific comorbidity index: a new tool for risk assessment before allogeneic HCT. Blood 106 (8): 2912-9, 2005.
2. ElSawy M, Storer BE, Pulsipher MA, et al.: Multi-centre validation of the prognostic value of the haematopoietic cell transplantation- specific comorbidity index among recipient of allogeneic haematopoietic cell transplantation. Br J Haematol 170 (4): 574-83, 2015.
3. Sorror ML, Storer BE, Maloney DG, et al.: Outcomes after allogeneic hematopoietic cell transplantation with nonmyeloablative or myeloablative conditioning regimens for treatment of lymphoma and chronic lymphocytic leukemia. Blood 111 (1): 446-52, 2008.
4. Sorror ML, Sandmaier BM, Storer BE, et al.: Comorbidity and disease status based risk stratification of outcomes among patients with acute myeloid leukemia or myelodysplasia receiving allogeneic hematopoietic cell transplantation. J Clin Oncol 25 (27): 4246-54, 2007.
5. Sorror M, Storer B, Sandmaier BM, et al.: Hematopoietic cell transplantation-comorbidity index and Karnofsky performance status are independent predictors of morbidity and mortality after allogeneic nonmyeloablative hematopoietic cell transplantation. Cancer 112 (9): 1992-2001, 2008.
6. Sorror ML, Martin PJ, Storb RF, et al.: Pretransplant comorbidities predict severity of acute graft-versus-host disease and subsequent mortality. Blood 124 (2): 287-95, 2014.
7. Smith AR, Majhail NS, MacMillan ML, et al.: Hematopoietic cell transplantation comorbidity index predicts transplantation outcomes in pediatric patients. Blood 117 (9): 2728-34, 2011.
8. Wood W, Deal A, Whitley J, et al.: Usefulness of the hematopoietic cell transplantation-specific comorbidity index (HCT-CI) in predicting outcomes for adolescents and young adults with hematologic malignancies undergoing allogeneic stem cell transplant. Pediatr Blood Cancer 57 (3): 499-505, 2011.
9. Sorror ML, Logan BR, Zhu X, et al.: Prospective Validation of the Predictive Power of the Hematopoietic Cell Transplantation Comorbidity Index: A Center for International Blood and Marrow Transplant Research Study. Biol Blood Marrow Transplant 21 (8): 1479-87, 2015.

Hematopoietic Stem Cell Transplant (HSCT)–Related Acute Complications

Infectious Risks and Immune Recovery After Transplant

Defective immune reconstitution is a major barrier to successful HSCT, regardless of graft source.[1,2] Serious infections have accounted for a significant percentage (4%–20%) of late deaths after HSCT.[3]

Factors that can significantly slow immune recovery include the following:[4]

• Graft manipulation (removal of T cells).
• Stem cell source (slow recovery with cord blood).
• Chronic graft-versus-host disease (GVHD).

Figure 1 illustrates the immune defects, contributing transplant-related factors, and types and timing of infections that occur after allogeneic transplant.[5]

Figure 1. Phases of predictable immune suppression with their opportunistic infections among allogeneic hematopoietic stem cell transplant recipients. Adapted from Burik and Freifeld. This figure was published in Clinical Oncology, 3rd edition, Abeloff et al., Chapter: Infection in the severely immunocompromised patient, Pages 941–956, Copyright Elsevier (2004).

Bacterial infections tend to occur in the first few weeks after transplant during the neutropenic phase, when mucosal barriers are damaged from the conditioning regimen. There is significant ongoing research into the role of prophylactic antibacterial medications during the neutropenic phase.[6]

A joint effort between the Centers for Disease Control and Prevention, the Infectious Disease Society of America, and the American Society of Transplantation and Cellular Therapy established guidelines for the prevention of infections after HSCT.[7] Approaches include preventive or prophylactic antivirals, antifungals, and antibiotics; escalation to heightened empiric therapy for signs of infection; and continued careful monitoring through the full duration of the immunocompromised period after HSCT.

Prophylaxis against fungal infections is standard during the first several months after transplant and may be considered for patients with chronic GVHD who are at high risk of fungal infection. Antifungal prophylaxis must be tailored to the patient's underlying immune status. Pneumocystis infections can occur in all patients after bone marrow transplants, and prophylaxis is mandatory.[6]; [8][Level of evidence C1]

After HSCT, viral infections can be a major source of mortality, especially after T-cell–depleted or cord blood procedures. Types of viral infections include the following:

• Cytomegalovirus (CMV). CMV infection has been a major cause of mortality in the past, but today, effective drugs to treat CMV are available. In addition, preventive strategies, including quantitative polymerase chain reaction (PCR) monitoring followed by preemptive therapy with ganciclovir, have been developed. In addition, the U.S. Food and Drug Administration (FDA) approved letermovir for CMV prophylaxis in adults. There is solid experience using letermovir in children aged 12 years and older and emerging experience in children younger than 12 years.[9,10]
• Epstein-Barr virus (EBV). EBV rarely causes lymphoproliferative disease and is generally associated with intensive, multidrug GVHD therapy or T-cell–depleted HSCT.
• Adenovirus. Adenovirus infection is a major issue in T-cell–depleted transplant, and monitoring by quantitative blood PCR followed by therapy with cidofovir or brincidofovir (available through a compassionate-use protocol) has led to a major decrease in morbidity.[11]
• Other. Other viruses have been implicated in hemorrhagic cystitis (BK virus), encephalitis and poor count recovery (human herpes virus 6), and other clinical issues.[6] One study suggested that high BK viral loads early after transplant (4–7 weeks) may be associated with long-term decreases in glomerular filtration rate.[12]

Careful viral monitoring is essential during high-risk allogeneic procedures.

Late bacterial infections can occur in patients who have central lines or patients with significant chronic GVHD. These patients are susceptible to infection with encapsulated organisms, particularly pneumococcus. Despite reimmunization, these patients can sometimes develop significant infections, and continued prophylaxis is recommended until a serological response to immunizations has been documented. Occasionally, postallogeneic HSCT patients can become functionally asplenic, and antibiotic prophylaxis is recommended. Patients should remain on infection prophylaxis (e.g., Pneumocystis jirovecii pneumonia prophylaxis) until immune recovery. Time to immune recovery varies but ranges from 3 months to 9 months after autologous HSCT, and 9 months to 24 months after allogeneic HSCT without GVHD. Patients with active chronic GVHD may have persistent immunosuppression for years. Many centers monitor T-cell subset recovery after bone marrow transplants as a guide to infection risk.[6]

Vaccination after transplant

International transplant and infectious disease groups have developed specific guidelines for the administration of vaccines after autologous and allogeneic transplants.[6,13,14,15] Comparative studies aimed at defining ideal timing of vaccination after transplant have not been performed, but the vaccine guidelines outlined in Table 2 result in protective titers in most patients who receive vaccinations. These guidelines recommend that autologous transplant recipients receive immunizations beginning at 6 months after stem cell infusion and receive live vaccines 24 months after the transplant. Patients undergoing allogeneic procedures can begin immunizations as soon as 6 months after transplant. However, many groups prefer to wait either until 12 months after the procedure for patients who continue to receive immunosuppressive drugs or until patients are no longer receiving immunosuppressants.

Vaccination recommendations should be reconsidered at times of local endemic or epidemic disease outbreaks. In those settings, earlier vaccination with killed vaccines may be implemented, acknowledging limited host responses. SARS-CoV-2 vaccination recommendations have been included in a recently updated consensus guideline on vaccines after HSCT.[15] Efficacy in gaining protective immunity has been noted with early studies, but given the way the virus has changed over time, the approach to vaccination for SARS-CoV-2 is an ongoing area of study.[16]

Sinusoidal Obstruction Syndrome/Veno-occlusive Disease (SOS/VOD)

Pathologically, SOS/VOD of the liver is the result of damage to the hepatic sinusoids, resulting in biliary obstruction. This syndrome has been estimated to occur in 15% to 40% of pediatric patients who undergo myeloablative transplants.[18,19]

Risk factors for SOS/VOD include the following:[18,19]

• Use of busulfan (especially before therapeutic pharmacokinetic monitoring).
• Total-body irradiation.
• Serious infection.
• GVHD.
• Preexisting liver dysfunction caused by hepatitis or iron overload.

SOS/VOD is defined clinically by the following:

• Right upper quadrant pain with hepatomegaly.
• Fluid retention (weight gain and ascites).
• Hyperbilirubinemia.

Life-threatening SOS/VOD generally occurs soon after transplant and is characterized by multiorgan system failure.[20] Milder, reversible forms can occur, with full recovery expected. Pediatric patients who have severe SOS/VOD without increased bilirubin have been reported.[21] Therefore, it is important to be vigilant about monitoring patients who have other symptoms without increased bilirubin.

Diagnosis of SOS/VOD

Older definitions of SOS/VOD include the modified Seattle criteria or the Baltimore criteria.

• In the Seattle criteria, at least two of the following must be present by day 20 post HSCT:[22]
  • Bilirubin level higher than 2 mg/dL.
  • Hepatomegaly or right upper quadrant pain.
  • Weight gain (>2%).
• In the Baltimore criteria, a bilirubin level of 2 mg/dL or higher and at least two of the following must be present by day 21 post HSCT:[23]
  • Painful hepatomegaly.
  • Weight gain (>5%).
  • Ascites.

These definitions are inadequate, especially in pediatric practice, as they do not recognize late-onset SOS/VOD or VOD with normal bilirubin levels.

The European Society for Blood and Marrow Transplantation (EBMT) have published revised criteria that are now broadly in use.[24] These criteria recognize late-onset SOS/VOD if proved histologically or have hemodynamic and/or ultrasound evidence of SOS/VOD (hepatomegaly, ascites, and decrease in velocity or reversal of portal flow). They have also included a modification for pediatric patients,[25] with no time limitation for SOS/VOD onset and the presence of two or more of the following:

• Unexplained consumptive and transfusion-refractory thrombocytopenia.
• Otherwise unexplained weight gain on three consecutive days, despite the use of diuretics, or weight gain greater than 5% above baseline value.
• Hepatomegaly above baseline value (best if confirmed by imaging).
• Ascites above baseline value (best if confirmed by imaging).
• Rising bilirubin level from a baseline value on three consecutive days or bilirubin level of 2 mg/dL or higher within 72 hours.

An additional modification of the diagnostic algorithm (Cairo/Cooke criteria) has been proposed, which allows for flexibility with symptoms in unusual situations.[26] The EBMT and Cairo/Cooke criteria have not been prospectively validated in clinical trials.

Prevention and treatment of SOS/VOD

Approaches to both prevention and treatment with agents such as heparin, protein C, and antithrombin III have been studied, with mixed results.[27] One small, retrospective, single-center study showed a benefit from corticosteroid therapy, but further validation is needed.[28]

Another agent with demonstrated activity is defibrotide, a mixture of oligonucleotides with antithrombotic and fibrinolytic effects on microvascular endothelium. Studies of defibrotide have shown the following:

• Decreased mortality in patients who were treated with defibrotide for severe SOS/VOD, compared with historical controls.[29,30,31,32]; [33][Level of evidence C1]
• Decreased SOS/VOD mortality associated with the early initiation of defibrotide treatment soon after diagnostic criteria for SOS/VOD were met.[34][Level of evidence B4]
• Efficacy in decreasing SOS/VOD incidence when used prophylactically.[35][Level of evidence A1] However, a second study was closed due to a lack of efficacy, questioning the validity of prophylactic defibrotide use.[36]

The FDA approved defibrotide for the treatment of patients who have hepatic SOS/VOD with renal or pulmonary dysfunction after HSCT.

The British Society for Blood and Marrow Transplantation (BSBMT) published evidence-guided recommendations for the diagnosis and management of SOS/VOD.[32] They recommend that biopsy be reserved for difficult cases and be performed using the transjugular approach. The BSBMT supports the use of defibrotide for the prevention of SOS/VOD (defibrotide prophylaxis is not currently part of the FDA indication) but maintains there is insufficient data to support the use of prostaglandin E1, pentoxifylline, or antithrombin. For treatment of SOS/VOD, they recommend aggressive fluid balance management, early involvement of critical care and gastroenterology specialists, and the use of defibrotide and possibly methylprednisolone. However, they concluded there is insufficient evidence to support the use of tissue plasminogen activator or N-acetylcysteine.[32,37] The Pediatric Transplantation and Cellular Therapy Consortium, which worked with the Pediatric Acute Lung Injury and Sepsis Investigators, published more detailed consensus recommendations for the diagnosis and management of SOS/VOD in children after HSCT.[38,39,40]

Transplant-Associated Thrombotic Microangiopathy (TA-TMA)

Although TA-TMA clinically mirrors hemolytic uremic syndrome, its causes and clinical course differ from those of other hemolytic uremic syndrome–like diseases. Studies have linked this syndrome with dysregulation of complement pathways.[41] TA-TMA has most frequently been associated with the use of the calcineurin inhibitors tacrolimus and cyclosporine, and it has been noted to occur more frequently when either of these medications is used in combination with sirolimus.[42]

Diagnostic criteria for this syndrome have been updated based on expert consensus opinion and are a modification of criteria published in 2014 (see Table 3).[43,44]

Evidence (impact of TA-TMA on HSCT outcomes):

1. A multicenter study of TA-TMA in pediatric patients used the following definition of TA-TMA:[46]
   1. Histological evidence of TA-TMA, or
   2. Presence of at least four of the following laboratory and clinical markers diagnostic for TA-TMA:
      • Lactate dehydrogenase (LDH) levels above reference value for age.
      • Schistocytes on peripheral blood smear.
      • De novo thrombocytopenia or requirement for platelet transfusions.
      • De novo anemia or requirement for red blood cell transfusions.
      • Hypertension greater than 99% for age (aged <18 years) or 140/90 mm Hg (aged ≥18 years) requiring ≥2 antihypertensive agents.
      • Proteinuria ≥30 mg/dL on random urine analysis twice or random urine protein to creatinine ratio >1 mg/mg.
      • Terminal complement activation: Elevated plasma sC5b-9 above normal limit (≥244 ng/mL).
   3. This study demonstrated the following results:
      • In 614 sequential patients who underwent allogeneic or autologous HSCT, 19% of allogeneic recipients and 10% of autologous recipients developed TA-TMA.
      • Patients who developed TA-TMA had increased rates of acute GVHD and steroid-refractory GVHD, intensive care unit admission, invasive ventilation, pericardial effusions, pulmonary hypertension, dialysis or continuous renal replacement therapy, acute kidney injury, and VOD.
      • In patients who underwent allogeneic HSCT, treatment-related mortality during the first 6 months was significantly higher in patients with TA-TMA than in those without TA-TMA (20% vs. 3%; P ≤ .0001).
      • In patients who underwent autologous HSCT, the overall survival (OS) rate during the first 6 months was significantly lower in patients with TA-TMA than in those without TA-TMA (79% vs. 98%; P = .001).

Treatment of TA-TMA

Treatment for TA-TMA includes the following:

• Cessation of the calcineurin inhibitor and substitution with other immune suppressants, if necessary.
• Careful management of hypertension and renal damage by dialysis, if necessary.

Prognosis for normal kidney function when disease is caused by calcineurin inhibitors alone is generally poor. However, most TA-TMA that is associated with the combination of a calcineurin inhibitor and sirolimus has been reversed after sirolimus is discontinued, and in some cases, after both medications are stopped.[42]

Some evidence suggests a role for complement modulation (c5, eculizumab therapy) in preserving renal function. Further assessment of the role of this medication in treating this complication is ongoing.[47,48,49] Although there are no randomized trials that used eculizumab to treat TA-TMA, there are published data from retrospective institutional and multicenter studies and one prospective trial. Historically, the 1-year survival rate for untreated patients with high-risk TA-TMA was about 20%.[50] Two retrospective studies that examined use of eculizumab showed survival that was better than historical controls. A single-center study showed a 1-year OS rate of 66%,[50] and a multicenter study reported a 6-month OS rate of 47% with eculizumab treatment.[51]

Evidence (treatment of high-risk TA-TMA with eculizumab):

A prospective multicenter trial enrolled 21 patients with high-risk TA-TMA and multisystem organ dysfunction. The eculizumab dosing regimen included intensive loading, induction, and maintenance phases for up to 24 weeks of therapy.[44]

• The primary outcome was met, with an OS rate of 71% at 6 months after HSCT (vs. 18% for untreated historical controls; P < .0001).
• Eleven of fifteen survivors (73%) had fully recovered organ function at the time of reporting.

Idiopathic Pneumonia Syndrome (IPS)

IPS is characterized by diffuse, noninfectious lung injury that occurs between 14 and 90 days after the infusion of donor cells. Possible etiologies include direct toxic effects of conditioning regimens and occult infection leading to secretion of high levels of inflammatory cytokines into the alveoli.[52]

The incidence of IPS appears to be decreasing, possibly because of less intensive preparative regimens, better HLA matching, and better definition of occult infections through PCR testing of blood and bronchioalveolar specimens. Mortality rates of 50% to 70% have been reported.[52] However, these estimates are from the mid-1990s, and outcomes may have improved.

Diagnostic criteria include the following signs and symptoms in the absence of documented infectious organisms:[53]

• Pneumonia.
• Evidence of nonlobar radiographic infiltrates.
• Abnormal pulmonary function.

Early assessment by bronchioalveolar lavage to rule out infection is important.

Treatment of IPS

The traditional therapy for IPS has been high-dose methylprednisolone and pulmonary support.

Etanercept is a soluble fusion protein that joins the extracellular ligand-binding domain of the tumor necrosis factor (TNF)–alpha receptor to the Fc region of the immunoglobulin G1 antibody. It acts by blocking TNF-alpha signaling. The addition of etanercept to steroid therapies has shown promising short-term outcomes (extubation, improved short-term survival) in single-center studies.[54] A large phase II trial of this approach in pediatric patients showed promising results, with OS rates of 89% at 1 month and 63% at 12 months.[55]

Autoimmune Cytopenias (AIC)

AIC after allogeneic HSCT can be restricted to one cell lineage (e.g., autoimmune hemolytic anemia), two cell lineages, or three cell lineages. Most data about AIC in pediatric patients after HSCT are reported from single-center experiences, with the number of cases ranging from 20 to 30 over a 10- to 20-year period.[56,57,58] The incidence of AIC is about 5% after allogeneic HSCT. Risk factors for developing AIC seem to be age younger than 10 years and having a nonmalignant disease as an HSCT indication. At least one study has identified use of serotherapy, use of cord blood as the donor source, and severe GVHD as risk factors, but this finding has not been confirmed in other studies. One study demonstrated that patients who develop AIC have inferior outcomes compared with patients who did not develop AIC.[58] However, other studies did not demonstrate an inferior outcome.[56,57]

The National Institutes of Health task force on chronic GVHD has recognized AIC as a possible atypical feature of chronic GVHD (although they may be distinct pathologically).[59] This group has created standardized diagnostic criteria and a proposed prospective study of this complication.

Treatment of AIC

The most common first-line therapy for AIC has been corticosteroids.[56,57,58] Additional immunosuppression or B-cell targeting monoclonal antibodies have been used and produced good responses. Intravenous immunoglobulin is used frequently as adjunct treatment for AIC and/or immunoglobulin replacement.[60] Some clinicians have used bortezomib or daratumumab as third-line agents, with responses noted.[61]

Epstein-Barr Virus (EBV)–Associated Lymphoproliferative Disorder

After HSCT, EBV infection incidence increases through childhood, from approximately 40% in children aged 4 years to more than 80% in teenagers. Patients with a history of previous EBV infection are at risk of EBV reactivation when undergoing HSCT procedures that result in intense, prolonged lymphopenia (T-cell–depleted procedures, use of antithymocyte globulin [ATG] or alemtuzumab, and, to a lesser degree, use of cord blood).[62,63,64]

Features of EBV reactivation can vary, from an isolated increase in EBV titers in the bloodstream as measured by PCR to an aggressive monoclonal disease with marked lymphadenopathy presenting as lymphoma (lymphoproliferative disorder).

Treatment of EBV-associated lymphoproliferative disorder

Isolated bloodstream reactivation of EBV can improve in some cases without therapy as immune function improves. However, lymphoproliferative disorder requires more aggressive therapy.

Treatment of EBV-associated lymphoproliferative disorder involves decreasing immune suppression and treatment with chemotherapy agents such as cyclophosphamide. CD20-positive EBV-associated lymphoproliferative disorder and EBV reactivation have been shown to respond to therapy with the CD20 monoclonal antibody therapy rituximab.[65,66,67] In addition, some centers have shown efficacy in treating or preventing this complication with therapeutic or prophylactic EBV-specific cytotoxic T cells.[68,69,70]

Improved understanding of the risk of EBV reactivation, early monitoring, and aggressive therapy have significantly decreased the risk of mortality from this challenging complication.

Acute GVHD

GVHD is the result of immunologic activation of donor lymphocytes targeting major or minor HLA disparities in the tissues of a recipient.[71] Acute GVHD usually occurs within the first 3 months posttransplant, although delayed acute GVHD has been noted with reduced-intensity conditioning and nonmyeloablative approaches, where achieving a high level of full donor chimerism is sometimes delayed.

Typically, acute GVHD presents with at least one of the following:

• Skin rash.
• Hyperbilirubinemia.
• Secretory diarrhea.

Acute GVHD is classified by staging the severity of skin, liver, and gastrointestinal involvement, and further combining the individual staging of these three areas into an overall grade that is prognostically significant (see Tables 4 and 5).[72] Patients with grade III or grade IV acute GVHD are at higher risk of mortality, generally resulting from organ system damage caused by infections or progressive acute GVHD that is sometimes resistant to therapy.

Because the outcomes of patients with different grades of acute GVHD vary, investigators have sought to more precisely define acute GVHD risk based on serum biomarkers. A study that included both adults and children used a score calculated based on the levels of a combination of three biomarkers (tumor necrosis factor receptor 1 [TNFR1], suppression of tumorigenicity 2 [ST2], and regenerating islet-derived 3-alpha [REG3-alpha]), measured at the onset of acute GVHD. Investigators were able to define patients with low (8%), intermediate (27%), and high (46%, P < .0001) risk of 6-month mortality. The biomarker score was more sensitive and specific for predicting survival than clinical staging.[74] Additional refining of the prediction algorithm showed that measurement of only two biomarkers (ST2 and REG3-alpha) reliably predicted outcome. In addition, after 4 weeks of therapy, changes in the biomarker score were able to further refine prediction of survival outcomes.[75] These findings have led to several studies targeting biomarker high-risk or low-risk subsets of patients with acute GVHD and are influencing clinicians regarding the timing and intensity of acute GVHD therapies.

Prevention and treatment of acute GVHD

Morbidity and mortality from acute GVHD can be reduced through immune suppressive medications given prophylactically or T-cell depletion of grafts, either ex vivo by actual removal of cells from a graft or in vivo with anti–T-lymphocyte antibodies (ATG or anti-CD52 [alemtuzumab]). A newer approach includes administering posttransplant cyclophosphamide on days 3 and 4 after HSCT.[76] While it does not affect stem cells in the graft, cyclophosphamide eliminates or reduces the function or proliferation of alloreactive T cells,[77] markedly decreasing rates of both acute and chronic GVHD.

Complete elimination of acute GVHD with intense T-cell depletion has generally resulted in increased relapse, more infectious morbidity, and increased EBV-associated lymphoproliferative disorder. Because of this result, most HSCT GVHD prophylaxis approaches try to balance risk by giving sufficient immune suppression to prevent severe acute GVHD but not completely remove GVHD risk.

GVHD prophylaxis approaches

GVHD prophylaxis has evolved, from one approach for all donor types to specific and varied approaches tailored to the following factors:

• Stem cell sources. For example, using higher intensity prophylaxis for mismatched bone marrow/peripheral blood stem cell (PBSC) HSCT, compared with low intensity/early immune tapering for matched-sibling bone marrow HSCT.[78]
• Clinical situations. For example, using planned early tapering of prophylaxis for high-risk disease to stimulate the graft-versus-leukemia (GVL) effect.[78]
• Intensity of the HSCT procedure. For example, using less intense prophylaxis for reduced-intensity regimens to increase the GVL effect because of the absence of myeloablation for disease control.

Because of these factors, it is best to consider the combination of preparative regimen, GVHD prophylaxis, and stem cell source as a unit because survival and toxicity outcomes vary if any of these three elements change.

GVHD prophylaxis for matched-sibling HSCT

The most commonly used GVHD prophylaxis approaches in pediatrics for matched-sibling HSCT consist of a calcineurin inhibitor (cyclosporine or tacrolimus), either as a single agent or in combination with methotrexate.[79,80] Doses of methotrexate are often lower for matched-sibling HSCT than for unrelated-donor HSCT. Many centers choose to give prophylaxis on three, rather than four, days after HSCT (days 1, 3, 6, and maybe 11). A large Children's Oncology Group study had good results tapering the calcineurin inhibitor on day 42 and discontinuing it by day 96 when using matched-sibling HSCT,[81] but the traditional taper starts on day 100 posttransplant and continues over 3 months when using unrelated bone marrow/PBSC and cord blood HSCT.

A calcineurin inhibitor in combination with mycophenolate mofetil has also been used with matched-sibling HSCT, especially when reduced-intensity conditioning approaches are used.[82] Posttransplant cyclophosphamide is effective in adult matched-sibling HSCT,[83] but has generally been given with PBSCs in combination with reduced-intensity conditioning approaches. Limited data address the use of posttransplant cyclophosphamide in children undergoing matched-sibling HSCT using bone marrow as a stem cell source,[84] but outcomes appear similar to standard approaches.

GVHD prophylaxis for matched unrelated-donor HSCT

A calcineurin inhibitor in combination with methotrexate (10 mg/m² for four doses) has been a standard approach that leads to excellent outcomes.[81] However, more recent studies have also shown excellent outcomes with posttransplant cyclophosphamide.[85,86,87]

A number of studies have assessed the role of ATG or alemtuzumab (both considered serotherapy, antibodies that deplete T cells) in improving outcomes after unrelated-donor bone marrow transplant.[88,89,90] Serotherapy includes anti–T-cell approaches (equine ATG and rabbit ATG against either a human T-cell leukemia line [ATG-Fresenius] or human thymocytes [thymoglobulin]) and anti-CD52 antibodies (alemtuzumab). Most centers use serotherapy after HSCT for nonmalignant diseases where GVL is not as important, but the results have varied when treating malignancies. Reasonable evidence suggests that when unrelated-donor PBSCs are used, serotherapy may be beneficial. Studies in children who received unrelated-donor bone marrow HSCT have shown that targeting rabbit ATG in a pharmacokinetic-dependent model leads to faster immune recovery and better outcomes.[91,92]

A combined adult and pediatric study compared abatacept (T-cell costimulatory blocker) plus a calcineurin inhibitor/methotrexate with placebo plus a calcineurin inhibitor/methotrexate. Patients who received abatacept had improved rates of grades 2 to 4 acute GVHD and severe GVHD-free survival.[93]

GVHD prophylaxis for mismatched unrelated-donor HSCT

Use of a calcineurin inhibitor/methotrexate for mismatched unrelated-donor HSCT has led to higher rates of severe GVHD and lower rates of survival. This outcome is partially mitigated by the use of serotherapy in combination with a calcineurin inhibitor/methotrexate. Using this combined approach, the International BFM Study Group has considered the use of a single-antigen mismatched donor (7/8 or 9/10) to be a well-matched donor, with outcomes similar to those with matched unrelated donors.[94]

A prospective trial in mismatched unrelated-donor recipients added abatacept to a calcineurin inhibitor/methotrexate regimen. The study showed a marked improvement in severe acute GVHD and OS, compared with a Center for International Blood and Marrow Transplant Research control trial that used a calcineurin inhibitor/methotrexate alone.[93] Posttransplant cyclophosphamide approaches have also led to improvements in outcomes when mismatched unrelated-donor HSCT have been used. A key trial run by the National Marrow Donor Program tested posttransplant cyclophosphamide using single and multiply mismatched unrelated donors. The results showed impressive decreases in acute and chronic GVHD and improved event-free survival and OS.[95] While these new approaches have revived interest in mismatched unrelated-donor use, prospective trials comparing mismatched unrelated donors using these new approaches with unrelated cord blood or haploidentical stem cell sources have not been performed.

GVHD prophylaxis for unrelated-donor cord blood HSCT

A calcineurin inhibitor/methotrexate and cyclosporine/prednisone regimen has been used as GVHD prophylaxis in cord blood HSCT. However, a number of studies in pediatric patients have documented better survival and GVHD outcomes using a calcineurin inhibitor/mycophenolate mofetil combination.[95,96,97] Although serotherapy has often been used for cord blood HSCT, especially in the context of nonmalignant indications, there is good evidence of improved outcomes and faster immune reconstitution without serotherapy.[98,99] Targeted dosing of serotherapy shows improved outcomes when used during cord blood HSCT, but a comparison of targeted serotherapy with no serotherapy has not been performed.

GVHD prophylaxis for haploidentical-donor HSCT

Early approaches using various intensities of GVHD prophylaxis and different types of T-cell depletion led to relatively poor rates of survival and high rates of GVHD when haploidentical donors were used.[100] The approach has changed dramatically with the use of posttransplant cyclophosphamide, both for bone marrow and PBSCs, leading to outcomes comparable to those for fully matched unrelated donors.[85]

The other widely used approach to haploidentical HSCT in pediatrics is T-cell receptor (TCR) alpha beta/CD19 depletion. Using this process, several pediatric groups have demonstrated outcomes similar to those for fully matched stem cell sources, with low rates of GVHD.[101,102,103] Studies that compare this method with posttransplant cyclophosphamide or other stem cell sources have not been performed. Other approaches to T-cell depletion (e.g., CD34+ isolation,[104] CD45RA depletion [105]) are used by some centers, but comparative studies with other approaches are not available.

Nutritional approaches to prevent GVHD

Other nonimmune approaches to prevent GVHD are emerging. In a double-blind randomized study, patients with low vitamin A levels received either one pretransplant dose of vitamin A or a placebo. Patients who received vitamin A had statistically less acute GVHD (grades II to IV), acute gastrointestinal GVHD, and chronic GVHD.[106]

Steroid-refractory acute GVHD

When significant acute GVHD occurs, first-line therapy is generally methylprednisolone.[107] Patients with acute GVHD who are resistant to this therapy have a poor prognosis. However, many patients respond to second-line agents (e.g., mycophenolate mofetil, infliximab, pentostatin, sirolimus, or extracorporeal photopheresis).[108] Ruxolitinib was approved in 2019 for the treatment of children aged 12 years and older with steroid-refractory acute GVHD, with an overall response rate of 55% and a complete response rate of 27% at day 28 after initiation of therapy. Comparative trials of these agents have not been performed, so a best option for steroid-refractory GVHD has not been identified.[109,110]

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99. Admiraal R, Lindemans CA, van Kesteren C, et al.: Excellent T-cell reconstitution and survival depend on low ATG exposure after pediatric cord blood transplantation. Blood 128 (23): 2734-2741, 2016.
100. Pulsipher MA: Haplo is the new black. Blood 124 (5): 675-6, 2014.
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104. Mehta PA, Davies SM, Leemhuis T, et al.: Radiation-free, alternative-donor HCT for Fanconi anemia patients: results from a prospective multi-institutional study. Blood 129 (16): 2308-2315, 2017.
105. Bleakley M, Heimfeld S, Loeb KR, et al.: Outcomes of acute leukemia patients transplanted with naive T cell-depleted stem cell grafts. J Clin Invest 125 (7): 2677-89, 2015.
106. Khandelwal P, Langenberg L, Luebbering N, et al.: A randomized phase 2 trial of oral vitamin A for graft-versus-host disease in children and young adults. Blood 143 (12): 1181-1192, 2024.
107. Jacobsohn DA: Acute graft-versus-host disease in children. Bone Marrow Transplant 41 (2): 215-21, 2008.
108. Deeg HJ: How I treat refractory acute GVHD. Blood 109 (10): 4119-26, 2007.
109. Jagasia M, Perales MA, Schroeder MA, et al.: Ruxolitinib for the treatment of steroid-refractory acute GVHD (REACH1): a multicenter, open-label phase 2 trial. Blood 135 (20): 1739-1749, 2020.
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Chronic Graft-Versus-Host Disease (GVHD)

Chronic GVHD is a syndrome that can involve a single organ system or several organ systems, with clinical features resembling an autoimmune disease.[1,2] Chronic GVHD is usually first noted 2 to 12 months after hematopoietic stem cell transplant (HSCT). Traditionally, symptoms occurring more than 100 days after HSCT were considered chronic GVHD, and symptoms occurring sooner than 100 days after HSCT were considered acute GVHD. Because some approaches to HSCT can lead to late-onset acute GVHD, and manifestations that are diagnostic for chronic GVHD can occur sooner than 100 days post-HSCT, the following three distinct types of chronic GVHD have been described:

• Classic chronic GVHD: Occurs with diagnostic and/or distinct features of chronic GVHD (see Tables 6–10) after a previous history of resolved acute GVHD.
• Overlap syndrome: An ongoing GVHD process when manifestations diagnostic for chronic GVHD occur while symptoms of acute GVHD persist.
• De novo chronic GVHD: New-onset GVHD generally occurring at least 2 months after transplant, with diagnostic and/or distinct features of chronic GVHD and no history or features of acute GVHD.

Organ Manifestations of Chronic GVHD

The diagnosis of chronic GVHD is based on clinical features (at least one diagnostic clinical sign, e.g., poikiloderma) or distinctive manifestations complemented by relevant tests (e.g., dry eye with positive results of a Schirmer test).[3]

Commonly involved tissues include the skin, eyes, mouth, hair, joints, liver, and gastrointestinal tract. Other tissues such as lungs, nails, muscles, urogenital system, and nervous system may also be involved. Tables 6 to 10 list organ manifestations of chronic GVHD, including a description of findings that are sufficient to establish the diagnosis of chronic GVHD. Biopsies of affected sites may be needed to confirm the diagnosis.[4]

Common skin manifestations include alterations in pigmentation, texture, elasticity, and thickness, with papules, plaques, or follicular changes. Patient-reported symptoms include dry skin, itching, limited mobility, rash, sores, or changes in coloring or texture. Generalized scleroderma may lead to severe joint contractures and debility. Associated hair loss and nail changes are common. Other important symptoms that should be assessed include dry eyes and oral changes such as atrophy, ulcers, and lichen planus. In addition, joint stiffness along with restricted range of motion, weight loss, nausea, difficulty swallowing, and diarrhea should be noted.

Risk Factors for Chronic GVHD

Chronic GVHD occurs in approximately 15% to 30% of children after sibling-donor HSCT [5] and in 20% to 45% of children after unrelated-donor HSCT. There is a higher risk of chronic GVHD with peripheral blood stem cells (PBSCs) and a lower risk with cord blood and selected approaches to haploidentical HSCT.[6,7,8]

Risk factors for the development of chronic GVHD include the following:[5,9,10]

• Patient's age (older than 10 years).
• Type of donor (unrelated and mismatched donors).
• Use of PBSCs.
• History of acute GVHD.
• Conditioning regimen (myeloablative and total-body irradiation (TBI)–based regimens).

Several factors have been associated with increased risk of nonrelapse mortality in children who develop significant chronic GVHD. Children who received HLA-mismatched grafts, received PBSCs, were older than 10 years, or had platelet counts lower than 100,000/µL at diagnosis of chronic GVHD have an increased risk of nonrelapse mortality.

The nonrelapse mortality rates were 17% at 1 year, 22% at 3 years, and 24% at 5 years after diagnosis of chronic GVHD. Many of these children required long-term immune suppression. By 3 years after diagnosis of chronic GVHD, about a third of children had died of either relapse or nonrelapse mortality, a third were off immune suppression, and a third still required some form of immune suppressive therapy.[11]

Older literature describes chronic GVHD as either limited or extensive. A National Institutes of Health (NIH) Consensus Workshop in 2006 broadened the description of chronic GVHD to three categories to better predict long-term outcomes.[12] The three NIH grading categories are as follows:[3]

• Mild disease: Involving only one or two sites, with no significant functional impairment (maximum severity score of 1 on a scale of 0 to 3).
• Moderate disease: Either involving more sites (>2) or associated with higher severity score (maximum score of 2 in any site).
• Severe disease: Indicating major disability (a score of 3 in any site or a lung score of 2).

Thus, high-risk patients include those with severe disease of any site or extensive involvement of multiple sites, especially those with the following:

• Symptomatic lung involvement.
• Skin involvement greater than 50%.
• Platelet count lower than 100,000/µL.
• Poor performance score (<60%).
• Weight loss of more than 15%.
• Chronic diarrhea.
• Progressive-onset chronic GVHD.
• History of steroid treatment with more than 0.5 mg/kg of prednisone per day for acute GVHD.

One study demonstrated a much higher chance of long-term GVHD-free survival and lower treatment-related mortality in children with mild and moderate chronic GVHD than in children with severe chronic GVHD. At 8 years, the probability of continued chronic GVHD was 4% for children with mild chronic GVHD, 11% for children with moderate chronic GVHD, and 36% for children with severe chronic GVHD.[13] In another large prospective trial with central review that used the NIH consensus criteria, about 28% of patients were misclassified as having chronic GVHD when they actually had late-acute GVHD. Additionally, there were significant challenges when using the NIH consensus criteria for bronchiolitis obliterans in children.[14]

Treatment of Chronic GVHD

Steroids remain the cornerstone of chronic GVHD therapy. However, many approaches have been developed to minimize steroid dosing, including the use of calcineurin inhibitors.[15] Topical therapy to affected areas is preferred for patients with limited disease.[16] The following agents have been tested with some success:

• Mycophenolate mofetil.[17]
• Pentostatin.[18]
• Sirolimus.[19]
• Rituximab.[20]
• Ibrutinib.[21]
• Ruxolitinib.[22]
• Belumosudil.[23]

Other approaches, including extracorporeal photopheresis, have been evaluated and show some efficacy in some patients.[24]

A series of drugs have been approved for the treatment of chronic GVHD in children.

Evidence (treatment of chronic GVHD in children):

1. Ibrutinib is indicated for pediatric patients aged 1 year or older with chronic GVHD after failure of one or more lines of systemic therapy. Efficacy of ibrutinib was evaluated in an open-label multicenter trial of pediatric and young adult patients with moderate or severe chronic GVHD. The study included 47 patients who had one or more lines of therapy fail. The median age was 13 years (range, 1–19 years).[25]
   • The overall response rate was 60% (95% confidence interval [CI], 44%–74%) by week 25.
   • The median duration of response was 5.3 months (95% CI, 2.8–8.8).
   • The median time from first response to death or new systemic therapies for chronic GVHD was 14.8 months.
2. The U.S. Food and Drug Administration (FDA) approved ruxolitinib for the treatment of chronic GVHD in adults and children older than 12 years after failure of one or two lines of systemic therapy. The approval was based on one study that randomly assigned 329 patients to receive either ruxolitinib or best available therapy.[22]
   • The overall response rate was 70% (95% CI, 63%–77%) for patients in the ruxolitinib arm and 57% (95% CI, 49%–65%) for patients in the best available therapy arm.
3. Belumosudil, a kinase inhibitor, was approved to treat chronic GVHD in adult and pediatric patients aged 12 years and older after failure of at least two prior lines of systemic therapy. The approval was based on a study of 65 patients with chronic GVHD that was refractory to multiple lines of therapy.[23]
   • The overall response rate was 74% (95%, 62%–84%) for patients who received 200 mg of belumosudil once per day and 77% (95% CI, 65%–87%) for patients who received 200 mg of belumosudil twice per day. High response rates were observed in all subgroups of patients.
   • All affected organs demonstrated complete responses.

No comparative studies have been performed with these three agents. Therefore, the best drug for specific types of chronic GVHD in children has yet to be determined.

Besides significantly affecting organ function, quality of life, and functional status, infection is the major cause of chronic GVHD–related death. Therefore, all patients with chronic GVHD receive prophylaxis against Pneumocystis jirovecii pneumonia, common encapsulated organisms, and varicella by using agents such as trimethoprim/sulfamethoxazole, penicillin, and acyclovir.

Transplant-related complications account for 70% of the deaths in patients with chronic GVHD.[5] Guidelines concerning ancillary therapy and supportive care of patients with chronic GVHD have been published.[16,26]

References:

1. Shlomchik WD, Lee SJ, Couriel D, et al.: Transplantation's greatest challenges: advances in chronic graft-versus-host disease. Biol Blood Marrow Transplant 13 (1 Suppl 1): 2-10, 2007.
2. Bolaños-Meade J, Vogelsang GB: Chronic graft-versus-host disease. Curr Pharm Des 14 (20): 1974-86, 2008.
3. Filipovich AH, Weisdorf D, Pavletic S, et al.: National Institutes of Health consensus development project on criteria for clinical trials in chronic graft-versus-host disease: I. Diagnosis and staging working group report. Biol Blood Marrow Transplant 11 (12): 945-56, 2005.
4. Shulman HM, Kleiner D, Lee SJ, et al.: Histopathologic diagnosis of chronic graft-versus-host disease: National Institutes of Health Consensus Development Project on Criteria for Clinical Trials in Chronic Graft-versus-Host Disease: II. Pathology Working Group Report. Biol Blood Marrow Transplant 12 (1): 31-47, 2006.
5. Zecca M, Prete A, Rondelli R, et al.: Chronic graft-versus-host disease in children: incidence, risk factors, and impact on outcome. Blood 100 (4): 1192-200, 2002.
6. Eapen M, Logan BR, Confer DL, et al.: Peripheral blood grafts from unrelated donors are associated with increased acute and chronic graft-versus-host disease without improved survival. Biol Blood Marrow Transplant 13 (12): 1461-8, 2007.
7. Eapen M, Rubinstein P, Zhang MJ, et al.: Outcomes of transplantation of unrelated donor umbilical cord blood and bone marrow in children with acute leukaemia: a comparison study. Lancet 369 (9577): 1947-54, 2007.
8. Bertaina A, Zecca M, Buldini B, et al.: Unrelated donor vs HLA-haploidentical α/β T-cell- and B-cell-depleted HSCT in children with acute leukemia. Blood 132 (24): 2594-2607, 2018.
9. Leung W, Ahn H, Rose SR, et al.: A prospective cohort study of late sequelae of pediatric allogeneic hematopoietic stem cell transplantation. Medicine (Baltimore) 86 (4): 215-24, 2007.
10. Arora M, Klein JP, Weisdorf DJ, et al.: Chronic GVHD risk score: a Center for International Blood and Marrow Transplant Research analysis. Blood 117 (24): 6714-20, 2011.
11. Jacobsohn DA, Arora M, Klein JP, et al.: Risk factors associated with increased nonrelapse mortality and with poor overall survival in children with chronic graft-versus-host disease. Blood 118 (16): 4472-9, 2011.
12. Pavletic SZ, Martin P, Lee SJ, et al.: Measuring therapeutic response in chronic graft-versus-host disease: National Institutes of Health Consensus Development Project on Criteria for Clinical Trials in Chronic Graft-versus-Host Disease: IV. Response Criteria Working Group report. Biol Blood Marrow Transplant 12 (3): 252-66, 2006.
13. Inagaki J, Moritake H, Nishikawa T, et al.: Long-Term Morbidity and Mortality in Children with Chronic Graft-versus-Host Disease Classified by National Institutes of Health Consensus Criteria after Allogeneic Hematopoietic Stem Cell Transplantation. Biol Blood Marrow Transplant 21 (11): 1973-80, 2015.
14. Cuvelier GDE, Nemecek ER, Wahlstrom JT, et al.: Benefits and challenges with diagnosing chronic and late acute GVHD in children using the NIH consensus criteria. Blood 134 (3): 304-316, 2019.
15. Koc S, Leisenring W, Flowers ME, et al.: Therapy for chronic graft-versus-host disease: a randomized trial comparing cyclosporine plus prednisone versus prednisone alone. Blood 100 (1): 48-51, 2002.
16. Couriel D, Carpenter PA, Cutler C, et al.: Ancillary therapy and supportive care of chronic graft-versus-host disease: national institutes of health consensus development project on criteria for clinical trials in chronic Graft-versus-host disease: V. Ancillary Therapy and Supportive Care Working Group Report. Biol Blood Marrow Transplant 12 (4): 375-96, 2006.
17. Martin PJ, Storer BE, Rowley SD, et al.: Evaluation of mycophenolate mofetil for initial treatment of chronic graft-versus-host disease. Blood 113 (21): 5074-82, 2009.
18. Jacobsohn DA, Gilman AL, Rademaker A, et al.: Evaluation of pentostatin in corticosteroid-refractory chronic graft-versus-host disease in children: a Pediatric Blood and Marrow Transplant Consortium study. Blood 114 (20): 4354-60, 2009.
19. Jurado M, Vallejo C, Pérez-Simón JA, et al.: Sirolimus as part of immunosuppressive therapy for refractory chronic graft-versus-host disease. Biol Blood Marrow Transplant 13 (6): 701-6, 2007.
20. Cutler C, Miklos D, Kim HT, et al.: Rituximab for steroid-refractory chronic graft-versus-host disease. Blood 108 (2): 756-62, 2006.
21. Miklos D, Cutler CS, Arora M, et al.: Ibrutinib for chronic graft-versus-host disease after failure of prior therapy. Blood 130 (21): 2243-2250, 2017.
22. Zeiser R, Polverelli N, Ram R, et al.: Ruxolitinib for Glucocorticoid-Refractory Chronic Graft-versus-Host Disease. N Engl J Med 385 (3): 228-238, 2021.
23. Cutler C, Lee SJ, Arai S, et al.: Belumosudil for chronic graft-versus-host disease after 2 or more prior lines of therapy: the ROCKstar Study. Blood 138 (22): 2278-2289, 2021.
24. González Vicent M, Ramirez M, Sevilla J, et al.: Analysis of clinical outcome and survival in pediatric patients undergoing extracorporeal photopheresis for the treatment of steroid-refractory GVHD. J Pediatr Hematol Oncol 32 (8): 589-93, 2010.
25. Carpenter PA, Kang HJ, Yoo KH, et al.: Ibrutinib Treatment of Pediatric Chronic Graft-versus-Host Disease: Primary Results from the Phase 1/2 iMAGINE Study. Transplant Cell Ther 28 (11): 771.e1-771.e10, 2022.
26. Carpenter PA, Kitko CL, Elad S, et al.: National Institutes of Health Consensus Development Project on Criteria for Clinical Trials in Chronic Graft-versus-Host Disease: V. The 2014 Ancillary Therapy and Supportive Care Working Group Report. Biol Blood Marrow Transplant 21 (7): 1167-87, 2015.

Late Mortality After Hematopoietic Stem Cell Transplant (HSCT)

The highest incidence of mortality after HSCT occurs in the first 2 years and is mostly caused by relapse. A study of late mortality (≥2 years posttransplant) in children with malignancies who underwent HSCT showed that approximately 20% of the 479 patients who were alive at 2 years had a late death. The late mortality rate was 15% in the allogeneic HSCT group (median follow-up, 10.0 years [2.0–25.6]), mainly caused by relapse (65%). A total of 26% of patients had a late death after autologous HSCT (median follow-up, 6.7 years [2.0–22.2]),[1] and recurrence of the primary malignancy accounted for 88% of these deaths. Nonrelapse mortality, death caused by chronic graft-versus-host disease (GVHD), and secondary malignancies are less common in children.

Another study reviewed the causes of late mortality after a second allogeneic transplant.[2] Of the children who were alive and relapse free 1 year after a second HSCT, 55% remained alive at 10 years. The most common cause of mortality between 1 and 10 years after HSCT in this group was relapse (77% of deaths), generally occurring in the first 3 years after transplant. The cumulative incidence of nonrelapse mortality at 10 years was 10% for this cohort. Chronic GVHD occurred in 43% of children in this study and was the leading cause of nonrelapse mortality.

One study focused on late mortality in children after autologous HSCT. The study showed that mortality rates of children who underwent transplant remained elevated compared with those of the general population more than 10 years after the procedure. However, their mortality rates approached the rates of the general population at 15 years. The study also showed a decrease in late mortality in the more current treatment eras (before 1990, 35.1%; 1990–1999, 25.6%; 2000–2010, 21.8%; P = .05).[3]

References:

1. Schechter T, Pole JD, Darmawikarta D, et al.: Late mortality after hematopoietic SCT for a childhood malignancy. Bone Marrow Transplant 48 (10): 1291-5, 2013.
2. Duncan CN, Majhail NS, Brazauskas R, et al.: Long-term survival and late effects among one-year survivors of second allogeneic hematopoietic cell transplantation for relapsed acute leukemia and myelodysplastic syndromes. Biol Blood Marrow Transplant 21 (1): 151-8, 2015.
3. Holmqvist AS, Chen Y, Wu J, et al.: Late mortality after autologous blood or marrow transplantation in childhood: a Blood or Marrow Transplant Survivor Study-2 report. Blood 131 (24): 2720-2729, 2018.

Late Effects After Hematopoietic Stem Cell Transplant (HSCT) in Children

Data from studies of child and adult survivors of HSCT have shown that treatment-related exposures have a significant impact on survival and quality of life.[1] In one study of patients who were alive 2 years after undergoing HSCT, survivors had a 9.9-fold increased risk of premature death compared with age- and sex-matched controls in the U.S. general population.[2] Another multicenter study showed that more than one-half of adult survivors who underwent HSCT during childhood would have a grade 3 or 4 chronic health issue. Survivors had an odds ratio (OR) of 15.1 compared with siblings.[3]

Methodological Challenges in the Study of Late Effects After HSCT

Although the main cause of death in patients who have undergone HSCT is from relapse of the primary disease, many of these patients die from infections related to graft-versus-host disease (GVHD), second malignancies, or cardiac or pulmonary issues.[2,4,5,6] In addition, other studies have revealed that up to 40% of HSCT survivors experience severe, disabling, and/or life-threatening events or die because of an adverse event associated with primary or previous cancer treatment.[7,8]

Before studies aimed at decreasing the incidence and severity of these effects are initiated, it is important to understand what leads to the development of these complications:

• Pretransplant therapy: Pretransplant therapy plays an important role, but the details of significant exposures associated with pre-HSCT therapy are not included in many studies.[9]
• Preparative regimen: The transplant preparative regimen itself, including total-body irradiation (TBI) and high-dose chemotherapy, has often been studied, but this intense therapy is only a small part of a long course of therapy filled with potential causes of late effects.
• Allogenicity: The effect of allogenicity—differences in major and minor HLA antigens that lead to GVHD, autoimmunity, chronic inflammation, and, sometimes, undetected organ damage—also contributes to these late effects.
• Extended exposure to nonchemotherapeutic agents: Patients who undergo transplants may receive immunosuppressants that have significant toxicity for an extended period of time (e.g., cyclosporine or tacrolimus, which can cause hypertension and kidney damage). In addition, it is routine for patients to receive extended courses of supportive medications or antimicrobials that can be associated with organ damage (e.g., liposomal amphotericin B). These medications should be considered when assessing the risk of late effects.

Individuals differ in their susceptibility to specific organ damage from chemotherapy or in their risk of GVHD based on genetic differences in both the donor and recipient.[9,10,11]

Cardiovascular System Late Effects

Although cardiac dysfunction has been studied extensively in non-HSCT settings, less is known about the incidence and predictors of congestive heart failure following HSCT in childhood. Potentially cardiotoxic exposures unique to HSCT include the following:[12]

• Conditioning with high-dose chemotherapy, especially cyclophosphamide.
• TBI.

HSCT survivors are at increased risk of developing cardiovascular risk factors such as hypertension and diabetes, partly as a result of exposure to TBI and prolonged immunosuppressive therapy after allogeneic HSCT or related to other health conditions (e.g., hypothyroidism or growth hormone deficiency).[8,12] In a study of 661 pediatric patients who survived at least 2 years after allogeneic HSCT, 52% of patients had obesity or were overweight at their most recent examination, 18% of patients had dyslipidemia (associated with pre-HSCT anthracycline or cranial or chest irradiation), and 7% of patients were diagnosed with diabetes.[13]

Rates of cardiovascular outcomes were examined among nearly 1,500 transplant survivors (surviving ≥2 years) who were treated in Seattle from 1985 to 2006. The survivors and a population-based comparison group were matched by age, year, and sex.[14] Survivors experienced increased rates of cardiovascular death (adjusted incidence rate difference, 3.6 per 1,000 person-years [95% confidence interval, 1.7–5.5]). Survivors also had an increased cumulative incidence of the following:

• Ischemic heart disease.
• Cardiomyopathy/heart failure.
• Stroke.
• Vascular diseases.
• Rhythm disorders.

Survivors also had an increased cumulative incidence of related conditions that increased their risk of developing more serious cardiovascular disease (i.e., hypertension, renal disease, dyslipidemia, and diabetes).[14]

In addition, cardiac function and pre-HSCT exposures to chemotherapy and radiation therapy have been shown to significantly impact post-HSCT cardiac function. In evaluating post-HSCT patients for long-term issues, it is important to consider levels of pre-HSCT anthracycline and chest irradiation.[15] Although more specific studies are needed to verify this approach, current evidence suggests that the risk of late-occurring cardiovascular complications after HSCT may largely result from pre-HSCT therapeutic exposures, with little additional risk from conditioning-related exposures or GVHD.[16,17]

For more information, see the Late Effects of the Cardiovascular System section in Late Effects of Treatment for Childhood Cancer.

Neurocognitive Late Effects

Many studies report normal neurodevelopment after HSCT, with no evidence of decline.[18,19,20,21,22,23,24,25]

Researchers from St. Jude Children's Research Hospital have reported on the largest longitudinal cohort to date, describing remarkable stability in global cognitive function and academic achievement during 5 years of posttransplant follow-up.[21,22,23] This research group reported poorer outcomes in patients who underwent unrelated-donor transplant when the patients received TBI and when they experienced GVHD. But these effects on outcomes were small compared with the much larger effects of socioeconomic status on cognitive function.[22] Most published studies report similar outcomes. Normal cognitive function and academic achievement were reported in a cohort of 47 patients monitored prospectively through 2 years post-HSCT.[25] Stable cognitive function was also noted in a large cohort monitored from pretransplant to 2 years post-HSCT.[20] A smaller study reported similar normal functioning and the absence of declines over time in HSCT survivors.[18] HSCT survivors did not differ from their siblings in cognitive and academic function, with the exception that survivors performed better than siblings on measures of perceptual organization.[19] Based on findings to date, it appears that HSCT poses low-to-minimal risk of late cognitive and academic deficits in survivors.

Several studies, however, have reported some decline in cognitive function after HSCT.[26,27,28,29,30,31,32] These studies tended to include samples with a high percentage of very young children. One study reported a significant decline in IQ in their cohort at 1 year post-HSCT, deficits that were maintained at 3 years post-HSCT.[27,28] Similarly, studies from Sweden have reported deficits in visual-spatial domains and executive functioning in very young children who underwent transplant with TBI.[30,31] Another study from St. Jude Children's Research Hospital reported that while all children younger than 3 years had a decline in IQ at 1 year after transplant, patients who did not receive TBI during conditioning recovered later. Patients who received TBI had a significantly lower IQ at 5 years (P = .05) than did those who did not receive TBI.[32]

For more information, see the Hematopoietic stem cell transplant (HSCT) section in Late Effects of Treatment for Childhood Cancer.

Digestive System Late Effects

Gastrointestinal, biliary, and pancreatic dysfunction

Most gastrointestinal late effects are related to protracted acute GVHD and chronic GVHD (see Table 11). For more information, see the Hepatobiliary section in Late Effects of Treatment for Childhood Cancer.

As GVHD is controlled and tolerance is developed, most symptoms resolve. Major hepatobiliary concerns include the consequences of viral hepatitis acquired before or during the transplant, biliary stone disease, and focal liver lesions.[33] Viral serology and polymerase chain reaction should be performed to differentiate these from GVHD presenting with hepatocellular injury.[34]

Iron overload

Iron overload occurs in almost all patients who undergo HSCT, especially if the procedure is for a condition associated with transfusion dependence before HSCT (e.g., thalassemia, bone marrow failure syndromes) or pre-HSCT treatments requiring transfusions after myelotoxic chemotherapy (e.g., acute leukemias). Inflammatory conditions such as GVHD also increase gastrointestinal iron absorption. Non-HSCT conditions leading to iron overload can lead to cardiac dysfunction, endocrine disorders (e.g., pituitary insufficiency, hypothyroidism), diabetes, neurocognitive effects, and second malignancies.[34]

The effects of iron overload on morbidity post-HSCT have not been well studied. However, reducing iron levels after HSCT for thalassemia has been shown to improve cardiac function.[62]

Data supporting iron reduction therapies (such as phlebotomy or chelation after HSCT) have not identified specific levels at which iron reduction should be performed. However, higher levels of ferritin and/or evidence of significant iron overload by liver biopsy or T2-weighted magnetic resonance imaging (MRI) [63] should be addressed by iron reduction therapy.[64]

Endocrine System Late Effects

Thyroid dysfunction

Studies show that rates of thyroid dysfunction in children after myeloablative HSCT vary, with larger series reporting an average incidence of about 30%.[65,66,67,68,69,70,71,72,73,74,75] A lower incidence in adults (on average, 15%) and a notable increase in incidence in children younger than 10 years who underwent HSCT suggest that a developing thyroid gland may be more susceptible to damage.[65,67,71,75]

Pretransplant local thyroid radiation contributes to high rates of thyroid dysfunction in patients with Hodgkin lymphoma.[65] Early studies showed very high rates of thyroid dysfunction after high single-dose fractions of TBI,[76] but traditional fractionated TBI/cyclophosphamide compared with busulfan/cyclophosphamide showed similar rates of thyroid dysfunction, suggesting a role for high-dose chemotherapy in thyroid damage.[68,69,70] Notably, one large study showed that patients treated with either TBI or busulfan had similar high rates of thyroid dysfunction, while patients treated with treosulfan or reduced-intensity, chemotherapy-based regimens had low rates of thyroid disease.[75] For more information, see the Posttransplant thyroid dysfunction section in Late Effects of Treatment for Childhood Cancer.

Higher rates of thyroid dysfunction occur with single-drug prophylaxis than with three-drug GVHD prophylaxis.[77] Increased rates of thyroid dysfunction occur after unrelated-donor HSCT than after related-donor HSCT (36% vs. 9%),[66] suggesting a role for alloimmune damage in causing thyroid dysfunction.[70,78]

Growth impairment

Growth impairment is generally multifactorial. Factors that play a role in failure to achieve expected adult height in young children who have undergone HSCT include the following:

• Diminished growth hormone level.
• Thyroid dysfunction.
• Disruption of pubertal sex hormone production.
• Steroid therapy.
• Poor nutritional status.

The incidence of growth impairment varies from 20% to 80%, depending on age, risk factors, and the definition of growth impairment used by reporting groups.[72,73,79,80,81,82] Risk factors include the following:[68,69,80,83]

• TBI.
• Cranial irradiation.
• Younger age.
• HSCT for acute lymphoblastic leukemia.
• HSCT occurring during a pubertal growth spurt.[84]

Patients younger than 10 years at the time of HSCT are at the highest risk of growth impairment, but they also respond best to growth hormone replacement therapy. Early screening and referral of patients with signs of growth impairment to endocrinology specialists can result in significant restoration of height in younger children.[82]

For more information, see the Growth hormone deficiency section in Late Effects of Treatment for Childhood Cancer.

Abnormal body composition and metabolic syndrome

After HSCT, adult survivors have a 2.3-fold higher risk of premature cardiovascular-related death compared with the general population.[85,86] The exact etiology of cardiovascular risk and subsequent death is largely unknown. However, the development of metabolic syndrome (a constellation of central obesity, insulin resistance, glucose intolerance, dyslipidemia, and hypertension), especially insulin resistance, as a consequence of HSCT has been suggested.[87,88,89]

In studies of conventionally treated leukemia survivors compared with those who underwent HSCT, transplant survivors are significantly more likely to manifest metabolic syndrome or multiple adverse cardiac risk factors, including central adiposity, hypertension, insulin resistance, and dyslipidemia.[34,90,91] The concern over time is that survivors who develop metabolic syndrome after HSCT will be at higher risk of significant cardiovascular-related events and/or premature death from cardiovascular-related causes.

For more information, see the Metabolic Syndrome section in Late Effects of Treatment for Childhood Cancer.

Sarcopenic obesity

The association of obesity with diabetes and cardiovascular disease risk in the general population is well established, but obesity as determined by body mass index (BMI) is uncommon in long-term survivors after HSCT.[91] However, despite having a normal BMI, HSCT survivors develop significantly altered body composition that results in both an increase in total percent fat mass and a reduction in lean body mass. This finding, called sarcopenic obesity, results in a loss of myocyte insulin receptors and an increase in adipocyte insulin receptors; the latter are less efficient in binding insulin and clearing glucose, ultimately contributing to insulin resistance.[92,93,94]

Preliminary data from 119 children and young adult survivors and 81 healthy sibling controls found that HSCT survivors had significantly lower weight but no differences in BMI or waist circumference when compared with siblings.[95] HSCT survivors had a significantly higher percent fat mass and lower lean body mass than did controls. HSCT survivors were significantly more insulin resistant than were controls, and they also had a higher incidence of other cardiovascular risk factors, such as elevated total cholesterol, low-density lipoprotein cholesterol, and triglycerides. These differences were found only in patients who had received TBI as part of their transplant conditioning regimen.

Musculoskeletal System Late Effects

Low bone mineral density

Few studies have addressed low bone mineral density after HSCT in children.[96,97,98,99,100,101,102] A significant portion of children experienced reduction in total-body bone mineral density or lumbar Z-scores showing osteopenia (18%–33%) or osteoporosis (6%–21%). Although general risk factors have been described (female sex, inactivity, poor nutritional status, White or Asian ethnicity, family history, TBI, craniospinal irradiation, corticosteroid therapy, GVHD, cyclosporine, and endocrine deficiencies [e.g., growth hormone deficiency, hypogonadism]), most reported populations have been too small for multivariate analysis to test the relative importance of each factor.[103,104,105,106,107,108,109,110,111,112,113]

Some studies in adults have shown improvement over time in low bone mineral density after HSCT.[101,114,115] However, this finding has yet to be shown in children.

Treatment for children has generally included a multifactorial approach, with vitamin D and calcium supplementation, minimization of corticosteroid therapy, participation in weight-bearing exercise, and resolution of other endocrine problems. The role of bisphosphonate therapy in children with this condition is unclear.

For more information, see the Osteoporosis and Fractures section in Late Effects of Treatment for Childhood Cancer.

Osteonecrosis

Reported incidence of osteonecrosis in children after HSCT has been 1% to 14%. However, these studies were retrospective and underestimated actual incidence because patients may have been asymptomatic early in the course of the disease.[116,117,118] Two prospective studies showed an incidence of 30% and 44% with routine MRI screening of possible target joints.[100,119] Osteonecrosis generally occurs within 3 years after HSCT, with a median onset of about 1 year. The most common locations include knees (30%–40%), hips (19%–24%), and shoulders (9%). Most patients experience osteonecrosis in two or more joints.[76,116,120,121]

In one prospective report, risk factors by multivariate analysis included age (markedly increased in children older than 10 years; OR, 7.4) and presence of osteonecrosis at the time of transplant. It is important to note that pre-HSCT factors such as corticosteroid exposure are very important in determining patient risk. In this study, 14 of 44 children who developed osteonecrosis had the disease before HSCT.[119] A Center for International Blood and Marrow Transplant Research (CIBMTR) retrospective nested control study of 160 cases and 478 control children suggested older age (>5 years), female sex, and the presence of chronic GVHD as risk factors for developing osteonecrosis.[122]

Treatment has generally consisted of minimization of corticosteroid therapy and surgical joint replacement. Most patients are not diagnosed until they present with symptoms. In one study of 44 patients with osteonecrosis lesions in whom routine yearly MRI was performed, 4 resolved completely and 2 had resolution in one of multiply involved joints.[119] The observation that some lesions can heal over time suggests caution in the surgical management of asymptomatic lesions.

For more information, see the Osteonecrosis section in Late Effects of Treatment for Childhood Cancer.

Reproductive System Late Effects

Pubertal development

Delayed, absent, or incomplete pubertal development commonly occurs after HSCT. Two studies showed pubertal delay or failure in 16% of female children who received cyclophosphamide alone, 72% of those who received busulfan/cyclophosphamide, and 57% of those who underwent fractionated TBI. In males, incomplete pubertal development or failure was noted in 14% of those who received cyclophosphamide alone, 48% of those who received busulfan/cyclophosphamide, and 58% of those who underwent TBI.[74,123] Boys who received more than 24 Gy of radiation to the testicles developed azoospermia and also experienced failure of testosterone production, requiring supplementation to develop secondary sexual characteristics.[124]

Fertility

Women

Pretransplant and transplant cyclophosphamide exposure is the best-studied agent affecting fertility. Postpubertal women younger than 30 years can tolerate up to 20 g/m² of cyclophosphamide and have preserved ovarian function. Prepubertal females can tolerate as much as 25 g/m² to 30 g/m². Although the additional effect added by pretransplant exposures to cyclophosphamide and other agents has not been specifically calculated in studies, these exposures plus transplant-related chemotherapy and radiation therapy lead to ovarian failure in 65% to 84% of females undergoing myeloablative HSCT.[125,126,127,128] The use of cyclophosphamide, busulfan, and TBI as part of the preparative regimen are associated with worse ovarian function. Younger age at the time of HSCT is associated with a higher chance of menarche and ovulation.[129,130] For more information, see the Ovarian function after HSCT section in Late Effects of Treatment for Childhood Cancer.

Studies of pregnancy are challenging because data seldom indicate whether individuals are trying to conceive. Nonetheless, a large study of pregnancy in pediatric and adult survivors of myeloablative transplant demonstrated conception in 32 of 708 patients (4.5%).[125] Of those trying to conceive, patients exposed to cyclophosphamide alone (total dose 6.7 g/m² with no pretransplant exposure) had the best chance of conception (56 of 103, 54%), while those receiving myeloablative busulfan/cyclophosphamide (0 of 73, 0%) or TBI (7 of 532, 1.3%) had much lower rates of conception.

Men

The ability of men to produce functional sperm decreases with exposure to higher doses and specific types of chemotherapy. Most men will become azoospermic at a cyclophosphamide dose of 300 mg/kg.[131] After HSCT, 48% to 85% of men will experience gonadal failure.[125,131,132] One study showed that men who received cyclophosphamide conceived only 24% of the time, compared with 6.5% of men who received busulfan/cyclophosphamide and 1.3% of those who underwent TBI.[125] For more information, see the Testicular function after HSCT section in Late Effects of Treatment for Childhood Cancer.

Effect of reduced-toxicity, reduced-intensity, or nonmyeloablative regimens

Based on clear evidence of dose effect and the lowered gonadotoxicity of some reduced-toxicity chemotherapy regimens, the use of reduced-intensity, reduced-toxicity, or nonmyeloablative regimens will likely lead to a higher chance of preserved fertility after HSCT. Because use of these regimens is relatively new and mostly confined to older or sicker patients, most reports have consisted of single cases. Registry reports are beginning to describe pregnancies after these procedures.[128] In addition, a single-center study compared myeloablative busulfan/cyclophosphamide with reduced-intensity fludarabine/melphalan.[133][Level of evidence C1] Spontaneous puberty occurred in 56% of girls and 89% of boys after busulfan/cyclophosphamide, whereas 90% of girls and all of the boys in the fludarabine/melphalan group entered puberty spontaneously (P = .012). Significantly more girls (61%) who received busulfan/cyclophosphamide required hormone replacement than did girls in the fludarabine/melphalan group (10.5%; P = .012). In boys, no difference was noted between the two conditioning groups in time to follicle-stimulating hormone (FSH) elevation (median, 4 years in the fludarabine/melphalan group vs. 6 years in the busulfan/cyclophosphamide group). While the two regimens have similar effects on testicular function, ovarian function seems to be better preserved in girls undergoing HSCT with reduced-intensity conditioning approaches.

Another study compared serum concentrations of antimüllerian hormone (AMH) and inhibin B in 121 children who survived more than 1 year following a single HSCT and received a treosulfan-based regimen (treosulfan; low-toxicity), a fludarabine/melphalan regimen (Flu/Mel; reduced-intensity), or a busulphan/cyclophosphamide regimen (Bu/Cy; myeloablative). Mean age at HSCT was 3.6 years; mean age at follow-up was 11.8 years. Mean length of follow-up was 9.9 years. Mean AMH standard deviation scores (SDS) were significantly higher after treosulfan (-1.047) and Flu/Mel (-1.255) than after Bu/Cy (-1.543), suggesting less ovarian reserve impairment after treosulfan and Flu/Mel than after Bu/Cy. Mean serum AMH concentration was significantly better with treosulfan (>1.0 μg/l) than with Flu/Mel or Bu/Cy. In males, mean inhibin B SDS was significantly higher after treosulfan (-0.506) than after Flu/Mel (-2.53) or some Bu/Cy (-1.23). The authors concluded that treosulfan-based regimens may confer a more favorable outlook for gonadal reserve in both sexes than Flu/Mel or Bu/Cy regimens.[134] A similar report showed better pubertal attainment and Leydig cell function in children receiving treosulfan regimens compared with busulfan and TBI-based approaches.[135]

An additional study compared gonadal function markers after myeloablative conditioning with Bu/Cy and cyclophosphamide/TBI regimens with a reduced-intensity conditioning regimen using fludarabine/melphalan/alemtuzumab.[136]

• Female patients who received reduced-intensity conditioning were less likely to develop primary ovarian insufficiency, as demonstrated by elevated FSH (P = .02) and low estradiol (P = .01) or elevated luteinizing hormone (P = .09).
• Most females in the reduced-intensity conditioning (75%) and myeloablative conditioning (93%) groups had low AMH levels, indicating low or absent ovarian reserve.
• In males, although median levels of inhibin B were higher after reduced-intensity conditioning, they were not significantly different between the two groups. Ten of 11 males who received reduced-intensity conditioning (91%) and all ten males who received myeloablative conditioning (100%) had azoospermia or oligospermia. The median time from HSCT to semen analysis was 3.7 years (range, 1.3–12.2 years).
• Many of these patients had pre-HSCT exposures to gonadotoxic drugs that were not taken into consideration in the analysis.
• Although this study was small, it provided evidence that risk of infertility after reduced-intensity conditioning regimens such as fludarabine/melphalan/alemtuzumab may be substantial.

Respiratory System Late Effects

Chronic pulmonary dysfunction

The following two forms of chronic pulmonary dysfunction are observed after HSCT:[137,138,139,140,141,142]

• Obstructive lung disease.
• Restrictive lung disease.

The incidence of both forms of lung toxicity can range from 10% to 40%, depending on donor source, the time interval after HSCT, definition applied, and presence of chronic GVHD. In both conditions, collagen deposition and the development of fibrosis in either the interstitial space (restrictive lung disease) or the peribronchiolar space (obstructive lung disease) are believed to underlie the pathology.[143]

Obstructive lung disease

The most common form of obstructive lung disease after allogeneic HSCT is bronchiolitis obliterans.[139,142,144,145] This condition is an inflammatory process resulting in bronchiolar obliteration, fibrosis, and progressive obstructive lung disease.[137]

Historically, the term bronchiolitis obliterans was used to describe chronic GVHD of the lung, and it begins 6 to 20 months after HSCT. Pulmonary function tests show obstructive lung disease with general preservation of forced vital capacity (FVC), reductions in forced expiratory volume in 1 second (FEV1), and associated decreases in the FEV1/FVC ratio with or without significant declines in the diffusion capacity of the lung for carbon monoxide (DLCO).

Risk factors for bronchiolitis obliterans include the following:[137,144]

• Lower pretransplant FEV1/FVC values.
• Concomitant pulmonary infections.
• Chronic aspiration.
• Acute and chronic GVHD.
• Older recipient age.
• Use of mismatched donors.
• High-dose (vs. reduced-intensity) conditioning.

The clinical course of bronchiolitis obliterans is variable, but patients frequently develop progressive and debilitating respiratory failure despite the initiation of enhanced immunosuppression.

Standard treatment for obstructive lung disease combines enhanced immunosuppression with supportive care, including antimicrobial prophylaxis, bronchodilator therapy, and supplemental oxygen, when indicated.[146] The potential role for tumor necrosis factor-alpha in the pathogenesis of obstructive lung disease suggests that neutralizing agents such as etanercept may have promise.[147]

Restrictive lung disease

Restrictive lung disease is defined by reductions in FVC, total lung capacity (TLC), and DLCO. In contrast to obstructive lung disease, the FEV1/FVC ratio is maintained near 100%. Restrictive lung disease is common after HSCT and has been reported in 25% to 45% of patients by day 100.[137] Importantly, declines in TLC or FVC occurring at 100 days and 1 year after HSCT are associated with an increase in nonrelapse mortality. Early reports suggested that the incidence of restrictive lung disease increases with advancing recipient age, but subsequent studies have revealed significant restrictive lung disease in children receiving HSCT.[148]

The most recognizable form of restrictive lung disease is bronchiolitis obliterans organizing pneumonia (BOOP), more recently called cryptogenic organizing pneumonia (COP). Clinical features include dry cough, shortness of breath, and fever. Radiographic findings show diffuse, peripheral, fluffy infiltrates consistent with airspace consolidation. Although reported in fewer than 10% of HSCT recipients, the development of BOOP/COP is strongly associated with previous acute and chronic GVHD.[143]

Patients with restrictive lung disease have limited responses to multiple agents such as corticosteroids, cyclosporine, tacrolimus, and azathioprine.[146] The potential role for tumor necrosis factor-alpha in the pathogenesis of restrictive lung disease suggests that neutralizing agents such as etanercept may have promise.[147]

For more information, see the Respiratory complications associated with HSCT section in Late Effects of Treatment for Childhood Cancer.

Urinary System Late Effects

Renal disease

Chronic kidney disease is frequently diagnosed after transplant. There are many clinical forms of chronic kidney disease, but the most commonly described ones include thrombotic microangiopathy, nephrotic syndrome, calcineurin inhibitor toxicity, acute kidney injury, and GVHD-related chronic kidney disease. Various risk factors associated with the development of chronic kidney disease have been described. However, recent studies suggest that acute and chronic GVHD may be a proximal cause of renal injury.[34]

In a systematic review of 9,317 adults and children from 28 cohorts who underwent HSCT, approximately 16.6% of patients (range, 3.6% to 89%) developed chronic kidney disease, defined as a decrease in estimated glomerular filtration rate of at least 24.5 mL/min/1.73 m² within the first year after transplant.[149] The cumulative incidence of chronic kidney disease developing approximately 5 years after transplant ranged from 4.4% to 44.3%, depending on the type of transplant and stage of chronic kidney disease.[150,151] Mortality rates among patients with chronic kidney disease in this setting were higher than those in transplant recipients who retained normal renal function, even when studies controlled for comorbidities.[152]

It is important to aggressively treat hypertension in patients post-HSCT, especially in those treated with prolonged courses of calcineurin inhibitors. Whether patients with post-HSCT albuminuria and hypertension benefit from treatment with angiotensin-converting enzyme (ACE) inhibitors or angiotensin receptor blockers requires further study, but careful control of hypertension with captopril, an ACE inhibitor, did show a benefit in a small study.[153]

Quality of Life

Health-related quality of life (HRQL)

HRQL is a multidimensional construct, incorporating a subjective appraisal of one's functioning and well-being, with reference to the impact of health issues on overall quality of life.[154,155] Many studies have shown that HRQL varies according to the following:[156]

• Time after HSCT: HRQL is worse with more recent HSCT.
• Transplant type: Unrelated-donor HSCT recipients have worse HRQL than do autologous or allogeneic related-donor HSCT recipients.
• Presence or absence of HSCT-related sequelae: HRQL is worse with chronic GVHD.

Pre-HSCT factors, such as family cohesion and a child's adaptive functioning, have been shown to affect HRQL.[157] Several groups have also identified the importance of pre-HSCT parenting stress on parental ratings of children's HRQL post-HSCT.[157,158,159,160,161] A report of the trajectories of HRQL over the 12 months after HSCT noted that the poorest HRQL was seen at 3 months post-HSCT, with steady improvement thereafter. Recipients of unrelated-donor transplants had the steepest declines in HRQL from baseline to 3 months. Another study reported that compromised emotional functioning, high levels of worry, and reduced communication during the acute recovery period had a negative impact on HRQL at 1-year post-HSCT.[162] Longitudinal studies identified an association of the following additional baseline risk factors with the trajectory of HRQL after HSCT:

• Child's age: Older children had worse HRQL.[157,163,164]
• Child's sex: Females had worse HRQL.[164]
• Rater: Mothers reported lower HRQL than did fathers; parents reported lower HRQL than did children.[165,166]
• Concordance by primary language or by sex of the raters: Concordant pairs reported higher HRQL.[167]
• Parental emotional distress: Greater parental distress led to worse HRQL.[163]
• Child's race: African American children had better HRQL.[164]

A report that investigated the impact of specific HSCT complications indicated that HRQL was worse among children with severe end-organ toxicity, systemic infection, or GVHD.[158] Cross-sectional studies reported that the HRQL among pediatric HSCT survivors of 5 years or longer was reasonably good, although psychological, cognitive, or physical problems appeared to negatively influence HRQL. Female sex, causal diagnosis for HSCT (e.g., acute myelogenous leukemia patients had worse HRQL), and intensity of pre-HSCT therapy were all identified as affecting HRQL post-HSCT.[168,169] Finally, another cross-sectional study of children 5 to 10 years post-HSCT cautioned that parental concerns about the child's vulnerability may induce overprotective parenting.[161]

Functional outcomes

Physician-reported physical performance

Clinician reports of long-term disability among childhood HSCT survivors suggest that the prevalence and severity of functional loss is low, as described in the following studies:

• A study from the European Society for Blood and Marrow Transplantation used the Karnofsky performance scale to report outcomes among 647 HSCT survivors (surviving ≥5 years).[170] In this cohort, 40% of survivors were younger than 18 years when they underwent transplant; only 19% had Karnofsky scores lower than 100. Seven percent had scores lower than 80, defined as the inability to work. Similar low rates of clinician-graded poor functional outcomes were reported by two other groups.[168,171]
• Among 50 survivors of childhood allogeneic HSCT treated at the City of Hope National Medical Center and Stanford University Hospital, all had Karnofsky scores of 90 or 100.[171]
• Among 73 young adults (mean age, 26 years) treated at the Karolinska University Hospital, the median Karnofsky score at 10 years post-HSCT was 90.[168]

Self-reported physical performance

Self-reported and proxy data among survivors of childhood HSCT indicated similar low rates of functional loss in the following studies:

• One study evaluated 22 survivors of childhood allogeneic HSCT (mean age at HSCT, 11 years; mean age at questionnaire, 25 years) and reported no differences between survivors' scores and population-expected values on standardized physical performance scales.[172]
• Another study compared a group of survivors who underwent transplant for childhood leukemia (n = 142) with a group of childhood leukemia survivors treated with chemotherapy alone (n = 288).[173] There were no differences between the groups on the physical function and leisure scales using multiple standardized measures.

Other studies that have reported functional limitations include the following:

• In the Bone Marrow Transplant Survivors Study (BMTSS) that included 235 survivors of childhood HSCT, 17% reported long-term physical performance limitations, compared with 8.7% of a sibling comparison group.[174]
• A Seattle study evaluated physical function in 214 young adults (median age at questionnaire, 28.7 years; 118 males) who underwent transplant at a median age of 11.9 years. When compared with age- and sex-matched controls, the HSCT survivors in this cohort scored one-half standard deviation lower on the physical component score of the SF-36 and the physical function and role physical subscales, quality-of-life measures.[169]
• A Swedish study also identified lower self-reported physical health among 73 young adult (median age, 26 years) HSCT survivors who were a median of 10 years after transplant. HSCT survivors scored significantly below population normative values on physical functioning (90.2 for HSCT survivors vs. 95.3 for population), satisfaction with physical health (66.0 for HSCT survivors vs. 78.7 for population), and role limitation because of physical health (72.7 for HSCT survivors vs. 84.9 for population).[168]

Measured physical performance

Objective measurements of function in the pediatric HSCT patient and survivor population hint that loss of physical capacity may be a bigger problem than revealed in studies that rely on clinician or self-report data. Studies measuring cardiopulmonary fitness have observed the following:

• One study used exercise capacity with cycle ergometry in a group of 20 children and young adults before HSCT, 31 patients at 1 year post-HSCT, and 70 healthy controls.[175] The average peak oxygen consumption was 21 mL/kg/min in the pre-HSCT group, 24 mL/kg/min in the post-HSCT group, and 34 mL/kg/min in the healthy controls. Among the HSCT survivors, 62% of those with cancer diagnoses scored in the lowest fifth percentile for peak oxygen consumption, compared with healthy controls.
• Another study examined exercise capacity with a Bruce treadmill protocol in 31 survivors of pediatric HSCT. In this cohort, 25.8% of HSCT survivors had exercise capacities in the 70% to 79% of predicted category, and 41.9% had exercise capacities in the lower than 70% of predicted category.[176]
• A third study investigated exercise capacity among 33 HSCT survivors who underwent transplant at a mean age of 11.3 years. At 5 years post-HSCT, only 4 of 33 survivors scored above the 75th percentile on a serial cycle ergometry test.[177]

Predictors of poor physical performance

The BMTSS found associations between poor physical performance outcomes and chronic GVHD, cardiac conditions, immune suppression, or treatment for a second malignant neoplasm.[178] In a study from the Fred Hutchison Cancer Research Center, poor performance was associated with myeloid disease.[169]

Published Guidelines for Long-Term Follow-Up

Several organizations have published consensus guidelines for follow-up for late effects after HSCT. The CIBMTR, along with the American Society of Blood and Marrow Transplant (ASBMT), and in cooperation with five other international transplant groups, published consensus recommendations for screening and preventive practices for long-term survivors of HSCT.[179]

Although some pediatric-specific challenges are addressed in these guidelines, many important pediatric issues are not. Some of these issues have been partially covered by general guidelines published by the Children's Oncology Group (COG) and other children's cancer groups (United Kingdom, Scotland). The COG has also published more specific recommendations for late effects surveillance after HSCT.[180] To address the lack of detailed, pediatric-specific, late-effects data and guidelines for long-term follow-up after HSCT, the Pediatric Transplantation and Cellular Therapy Consortium (PTCTC) published six detailed papers outlining existing data and summarizing recommendations from key groups (CIBMTR/ASBMT, COG, and the United Kingdom), along with expert recommendations for pediatric-specific issues.[9,34,64,181,182,183]

Although international efforts at further standardization and harmonization of pediatric-specific follow-up guidelines are under way, the PTCTC summary and guideline recommendations provide a consensus outline for monitoring children for late effects after HSCT.[64]

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Latest Updates to This Summary (09 / 27 / 2024)

The PDQ cancer information summaries are reviewed regularly and updated as new information becomes available. This section describes the latest changes made to this summary as of the date above.

Hematopoietic Stem Cell Transplant (HSCT)–Related Acute Complications

Added text to state that the U.S. Food and Drug Administration approved letermovir for cytomegalovirus prophylaxis in adults. There is solid experience using letermovir in children aged 12 years and older and emerging experience in children younger than 12 years (cited Russo et al. and Galaverna et al. as references 9 and 10, respectively).

Added text to state that a newer approach to preventing graft-versus-host disease (GVHD) includes administering posttransplant cyclophosphamide on days 3 and 4 after HSCT (cited Luznik et al. as reference 76). While it does not affect stem cells in the graft, cyclophosphamide eliminates or reduces the function or proliferation of alloreactive T cells, markedly decreasing rates of both acute and chronic GVHD (cited Nunes et al. as reference 77).

Added GVHD prophylaxis approaches as a new subsection.

Added Nutritional approaches to prevent GVHD as a new subsection.

This summary is written and maintained by the PDQ Pediatric Treatment Editorial Board, which is editorially independent of NCI. The summary reflects an independent review of the literature and does not represent a policy statement of NCI or NIH. More information about summary policies and the role of the PDQ Editorial Boards in maintaining the PDQ summaries can be found on the About This PDQ Summary and PDQ® Cancer Information for Health Professionals pages.

About This PDQ Summary

Purpose of This Summary

This PDQ cancer information summary for health professionals provides comprehensive, peer-reviewed, evidence-based information about the complications, graft-versus-host disease, and late effects after hematopoietic stem cell transplant for the treatment of pediatric cancer. It is intended as a resource to inform and assist clinicians in the care of their patients. It does not provide formal guidelines or recommendations for making health care decisions.

Reviewers and Updates

This summary is reviewed regularly and updated as necessary by the PDQ Pediatric Treatment Editorial Board, which is editorially independent of the National Cancer Institute (NCI). The summary reflects an independent review of the literature and does not represent a policy statement of NCI or the National Institutes of Health (NIH).

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The lead reviewers for Complications, Graft-Versus-Host Disease, and Late Effects After Pediatric Hematopoietic Stem Cell Transplant are:

• Thomas G. Gross, MD, PhD (National Cancer Institute)
• Michael A. Pulsipher, MD (Huntsman Cancer Institute at University of Utah)

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PDQ® Pediatric Treatment Editorial Board. PDQ Complications, Graft-Versus-Host Disease, and Late Effects After Pediatric Hematopoietic Stem Cell Transplant. Bethesda, MD: National Cancer Institute. Updated <MM/DD/YYYY>. Available at: https://www.cancer.gov/types/childhood-cancers/hp-stem-cell-transplant/gvhd. Accessed <MM/DD/YYYY>. [PMID: 35133768]

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Last Revised: 2024-09-27