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Chimerism status after unrelated donor bone marrow transplantation with fludarabine-melphalan conditioning is affected by the melphalan dose and is predictive of relapse

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Abstract

Little is known regarding the chimerism status after reduced-intensity conditioning transplantation when bone marrow is used as a stem cell source. We prospectively analyzed lineage-specific chimerism and retrospectively evaluated clinical outcomes in 80 adult patients who underwent unrelated donor bone marrow transplantation (URBMT) with fludarabine plus melphalan (FM) as the conditioning regimen. Mixed donor chimerism (MDC) was seen in 43 and 10 % of patients at days 14 and 28, respectively. Melphalan at ≤130 mg/m2 was associated with an increased incidence of MDC at day 28 (P = 0.03). Patients with MDC at day 14 showed a marginally increased risk of primary graft failure and a marginally decreased risk of graft-versus-host disease. In multivariate analysis, MDC at day 14 was associated with higher overall mortality (hazard ratio (HR) = 2.1; 95 % confidence interval (CI), 1.1–4.2; P = 0.04) and relapse rate (HR = 3.0; 95 % CI, 1.2–7.5; P = 0.02), but not with non-relapse mortality (HR = 1.8; 95 % CI, 0.70–4.6; P = 0.23). Thus, the FM regimen yields prompt complete donor chimerism after URBMT, but the melphalan dose significantly impacts the kinetics of chimerism. Chimerism status evaluation at day 14 may be instrumental in predicting relapse after URBMT with the FM regimen.

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Acknowledgments

This work was supported in part by a Grant (H25-Immunology-104) from the Ministry of Health, Labor and Welfare, Japan (M.M.).

Conflict of interest

H. Kiyoi received research funding from Bristol-Myers Squibb, Chugai Pharmaceutical Co. LTD., Kyowa Hakko Kirin Co. LTD., Dainippon Sumitomo Pharma, Zenyaku Kogyo, and FUJIFILM Corporation. The other authors have nothing to disclose.

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Correspondence to Seitaro Terakura.

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Imahashi, N., Ohashi, H., Terakura, S. et al. Chimerism status after unrelated donor bone marrow transplantation with fludarabine-melphalan conditioning is affected by the melphalan dose and is predictive of relapse. Ann Hematol 94, 1139–1148 (2015). https://doi.org/10.1007/s00277-015-2312-4

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