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  • Title: Long-term Outcome of Allogeneic Hematopoietic Stem Cell Transplantation From Unrelated Donor Using Tacrolimus/Sirolimus-based GvHD Prophylaxis: Impact of HLA Mismatch.
    Author: Al Malki MM, Gendzekhadze K, Yang D, Mokhtari S, Parker P, Karanes C, Palmer J, Snyder D, Forman SJ, Nademanee A, Nakamura R.
    Journal: Transplantation; 2020 May; 104(5):1070-1080. PubMed ID: 31449184.
    Abstract:
    BACKGROUND: While tacrolimus and sirolimus (T/S)-based graft-versus-host disease (GvHD) prophylaxis has been effective in preventing acute GvHD post hematopoietic cell transplantation (HCT), its efficacy and long-term outcome in matched (MUD) and mismatched unrelated donor (mMUD) setting is not well defined. METHODS: Herein, we evaluated a consecutive case-series of 482 patients who underwent unrelated donor HCT (2005-2013) with T/S-based GvHD prophylaxis. RESULTS: With a median follow-up of 6.2 years (range = 2.4-11.3), the 5-year overall survival (OS) and relapse/progression-free survival were 47.5% (95% confidence interval [CI]: 43.0-52.0) and 43.6% (95% CI: 39.1-48.1), respectively; and the 5-year cumulative incidence of nonrelapse mortality (NRM) and relapse were 24.9%, and 31.5%, respectively. In this cohort, mMUD was associated with worse OS (39.0% versus 50.7% at 5 y; P = 0.034), primarily due to greater risk of NRM (33.5% versus 21.7%; P = 0.038). While rates of relapse, acute (II-IV or III-IV) or chronic GvHD (limited or extensive) were not different, death caused by chronic GvHD (20.8% versus 12.8%; P = 0.022) and infection (33.0% versus 18.1%; P < 0.01) were significantly greater in mMUD. In multivariable analysis, high-risk disease (hazard ratio [HR] = 2.21, 95% CI: 1.16-4.23; P < 0.01) and mMUD (HR = 1.55, 95% CI: 1.15-2.08; P = 0.004) were independent predictive factors for OS. CONCLUSIONS: T/S-based GvHD prophylaxis is an effective and acceptable GvHD prophylactic regimen. However, survival after mMUD remained poor, possibly related to the severity of chronic GvHD.
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