Abstract
Outcomes of allogeneic hematopoietic stem cell transplantation (allo-HSCT) for patients with adult T cell leukemia/lymphoma (ATL) are not satisfactory, particularly in patients in non-complete remission at transplantation (Pt-non-CR). We conducted a regional retrospective study in the ATL endemic area of Okinawa, Japan. Of 62 ATL patients, 21 received allo-HSCT in CR and 41 in non-CR. The 3-year overall survival (3yOS) rate and median survival time for the whole cohort was 25.6% and 7.7 months, respectively. The 3yOS of Pt-non-CR was significantly lower than that of patients in CR (Pt-CR) (16.8% vs. 43.6%, P = 0.005). Transplant-related mortality (TRM) was significantly higher in Pt-non-CR than in Pt-CR (46.3% vs. 15.7%, P = 0.025), while there was no significant difference in disease-associated mortality (DAM) between Pt-non-CR and Pt-CR. Multivariable analysis for Pt-non-CR revealed that poor performance status (poor-PS) and higher sIL-2R level (high sIL-2R) adversely affected OS. Poor-PS was associated with higher TRM, but not with higher DAM in Pt-non-CR. High sIL-2R did not affect TRM or DAM in Pt-non-CR. Overall, high TRM rates rather than DAM contribute to the poor outcomes of Pt-non-CR, suggesting that not only disease control but also management of transplant-related complications is required for allo-HSCT in ATL patients.
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Acknowledgements
The authors thank Masumi Shimoji for technical assistance with data management. This work was supported by JSPS KAKENHI Grant Number 17K09934 and MEXT KAKENHI Grant Number 17H05797 to SM.
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ST, SM, YN, and HM participated in the design of the study; ST, SM, YN, SN, KT, KM, IT, NS, TH, SK, SU, RM, TM, K.Karimata, MO, AY, TT, K.Karube, and TF collected clinical data; ST and SM performed statistical data analysis; and ST, SM, and HM wrote the paper. All authors checked the final version of the paper.
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Tomori, S., Morishima, S., Nishi, Y. et al. Transplant-related complications are impediments to the success of allogeneic hematopoietic stem cell transplantation for adult T cell leukemia patients in non-complete remission. Bone Marrow Transplant 55, 233–241 (2020). https://doi.org/10.1038/s41409-019-0669-z
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DOI: https://doi.org/10.1038/s41409-019-0669-z


