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Cost effectiveness of reduced intensity conditioning and transplantation of unrelated umbilical cord blood versus HLA haploidentical related bone marrow for adults with hematologic malignancies.

6591 Background: BMT CTN 1101 was a Phase III randomized controlled trial evaluating the comparative effectiveness of unrelated umbilical cord blood (UCB) versus HLA-haploidentical related donor bone marrow (haplo-BM) cell sources for hematopoietic cell transplantation (HCT) in patients with high-risk hematologic malignancies (leukemias, lymphomas). We report results of an economic evaluation conducted as part of the clinical trial. Methods: 368 patients (90% of planned accrual) enrolled from 33 centers in the U.S. were randomly assigned to unrelated UCB (n=186) or haplo-BM (n=182) transplant. Healthcare utilization and costs were estimated using propensity-score matched cohorts of BMT patients in the OptumLabs Data Warehouse for trial participants <65 years, and Medicare claims for trial participants ≥65 years. Cost-effectiveness was calculated from payer perspectives (commercial, Medicare) over a 20-year time horizon from time of transplant. Weibull models (best fit based on AIC/BIC) were used to extrapolate survival from 5-year trial follow-up data. Trial participant surveys (EQ-5D) were used to derive health state utilities for estimating Quality-Adjusted Life Years (QALYs). One-way and probabilistic sensitivity analyses were conducted to assess uncertainty in results. Outcomes were discounted at 3% annually. Results: At 5-year follow-up, overall survival was 42% for haplo-BM versus 36% for UCB (P=.06). Over a 20-year time horizon, haplo-BM is expected to be more effective and more costly for <65 year-olds and in ≥65 year-olds it is expected to be more effective and less costly. In one-way uncertainty analyses, for persons <65, the cost/QALY result was most sensitive to life years and health state utilities. For persons ≥65, life years were more influential than costs and health state utilities. Using probabilistic sensitivity analysis, for persons <65 there was a 43% chance that haplo-BM was cost-effective using a willingness to pay threshold of $150k/QALY and 52% at a $200K/QALY threshold. Conclusions: Results from a large national clinical trial indicate that compared to UCB, haplo-BM was moderately cost-effective for patients aged <65 years, and less costly and more effective for persons ≥65 years. Haplo-BM is a fair value choice for commercially insured patients with high-risk leukemia and lymphoma who require HCT. For Medicare enrollees, haplo-BM is a preferred choice when considering costs and outcomes. [Table: see text]