Quality of Life and Comorbidities of Adult Survivors of Allogeneic Hematopoietic Cell Transplant Versus Their Siblings

Background: Survivors of allogeneic hematopoietic cell transplant (allo-HCT) are at risk of developing chronic health conditions. Prior studies have shown that survivors of allo-HCT in childhood/young adulthood who mainly received high dose total body irradiation (TBI)-based conditioning experience excess health conditions and more distress vs. their siblings. In recent years, allo-HCT is offered to adults of increasing age and there has been increasing use of chemotherapy +/- low dose TBI conditioning rather than high dose TBI. We set out to describe and compare the QoL and comorbidities of adults who underwent allo-HCT with chemotherapy +/- low dose TBI conditioning vs. their siblings. Methods: Allo-HCT recipients attending 1 of 2 survivorship clinics at ≥2 years post-HCT without active cGVHD or relapse, were enrolled. Beginning in 2023, participants were asked to forward an electronic version of the study survey to their biological sibling(s). The survey includes the PROMIS-Global Health instrument: raw scores are converted to a mental (MH) and physical health (PH) subscale T-score (population mean 50/SD 10). Comorbidities were scored with a published post allo-HCT morbidity index. Associations between MH and PH-related QoL, comorbidities, and patient/transplant-related variables were investigated with linear regression. Patient and sibling comparisons were made with paired sample and chi-square tests. A significance level of