Improving outcomes after allogeneic hematopoietic cell transplantation for Hodgkin lymphoma in the brentuximab vedotin era

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Allogeneic hematopoietic cell transplantation (alloHCT) remains a valuable treatment alternative for relapsed/refractory (R/R) Hodgkin lymphoma (HL). Data on alloHCT outcomes in the era of new HL therapies are needed. We evaluated 72R/R HL patients who received reduced intensity conditioning alloHCT and compared the time periods 2009-2013 (n = 20) with 2000-2008 (n = 52). Grafts included HLA-matched sibling (35%), unrelated donor (8%) and umbilical cord blood (56%). In the recent period, patients more often received brentuximab vedotin (BV, 60% vs 2%), had fewer comorbidities (Sorror index 0: 60% vs 12%) and were in complete remission (50% vs 23%). Median follow-up was 4.4 years. Three-year PFS improved for patients treated between 2009 and 2013 (49%, 95% CI 26-68%) as compared with the earlier era (23%, 95% CI 13-35%, P = 0.02). Overall survival (OS) at 3 years was 84% (95% CI 57-94%) vs 50% (95% CI 36-62%, P = 0.01), reflecting lower non-relapse mortality and relapse rates. In multivariate analysis mortality was higher among those with chemoresistance (HR 3.83, 95% CI 1.38-10.57), while treatment during the recent era was associated with better OS (HR for period 2009-2013: 0.24, 95% CI 0.07-0.79) and PFS (HR 0.46, 95% CI 0.23-0.92). AlloHCT in patients with R/R HL is now a more effective treatment than previously.

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