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An 8-year pragmatic observation evaluation of the benefits of allogeneic HCT in older and medically infirm AML patients
We designed a prospective, observational study enrolling patients presenting for treatment of AML at 13 institutions to analyze associations between hematopoietic cell transplantation (HCT) and survival, quality of life (QOL), function and geriatric health, in 6 groups: 1) the entire cohort, 2) ≥65 years old, 3) high comorbidity burden, 4) intermediate cytogenetic-risk, 5) adverse cytogenetic-risk, and 6) first complete remission with or without measurable residual disease. Patient health and preferences were assessed eight times across 2 years. Time-dependent regression models were used. Among 692 evaluable patients, 46% received HCT with 2-year survival of 58%. In unadjusted models, HCT was associated with reduced risks of mortality in the entire group and most of the subgroups. However, after accounting for covariates associated with increased mortality (age, comorbidity-burden, disease risks, frailty, impaired QOL, depression, and impaired function), the associations between HCT and longer survival disappeared in all groups. While function, social life, performance status, and depressive symptoms were better for those selected for HCT compared to those who were not, these health advantages were lost after receiving HCT. Recipients and non-recipients of HCT similarly ranked and expected cure as main goal of therapy, while physicians expected more cure for the formers. Accounting for health impairments negate survival benefits from HCT for AML, suggesting that the unadjusted observed benefit is due mostly to selection of the healthier candidates. Considering patients' overall expectations of cure but also the QOL burdens of HCT motivate the need for randomized trials to identify the best candidates for HCT