Unmanipulated haploidentical hematopoietic stem cell transplantation using very low-dose antithymocyte globulin and methylprednisolone in adults with relapsed/refractory acute leukemia
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Allogeneic hematopoietic stem cell transplantation (HSCT) could be the only curative therapy for patients with relapsed/refractory acute leukemia (RRAL). Many reports have described unmanipulated haploidentical HSCT (HID-HSCT) using high-dose antithymocyte globulin (ATG). However, the transplant outcomes of HID-HSCT using very low-dose ATG (thymoglobulin, 2–2.5 mg/kg) and methylprednisolone (mPSL, 1 mg/kg) for patients with RRAL have not been reported. We compared the outcomes of 46 patients with RRAL who underwent HID-HSCT using very low-dose ATG (thymoglobulin) and mPSL with the outcomes of 72 patients who underwent non-HID-HSCT. Patient characteristics differed regarding conditioning intensity (myeloablative; 19.6% in HID-HSCT vs. 61.1% in non-HID-HSCT, P < 0.001) and having undergone multiple HSCT (26.1% vs. 11.1%, P = 0.045). However, we found no significant differences in the 1-year overall survival (OS, 31.7% vs. 29.1%; P = 0.25), disease-free survival (DFS, 20.5% vs. 23.7%; P = 0.23), cumulative incidence of relapse (CIR, 40.0% vs. 42.8%; P = 0.92), non-relapse mortality (NRM, 39.5% vs. 33.5%; P = 0.22), or 100-day grade II–IV acute graft-versus-host disease (32.6% vs. 34.7%; P = 0.64) following HID-HSCT vs. non-HID-HSCT, respectively. Subgroup analysis stratified by disease and intensity of conditioning regimen demonstrated the same results between HID-HSCT and non-HID-HSCT. Furthermore, multivariate analysis showed that HID-HSCT was not an independent prognostic factor for OS (hazard ratio (HR) = 0.95 [95% confidence interval (CI), 0.58–1.58]), DFS (HR = 1.05 [95%CI, 0.67–1.68]), CIR (HR = 0.84 [95%CI, 0.48–1.47]), or NRM (HR = 1.28 [95%CI, 0.66–2.46]). In summary, transplant outcomes for RRAL were comparable in the HID-HSCT and non-HID-HSCT groups. HID-HSCT using very low-dose ATG and mPSL for RRAL may be a viable alternative to non-HID-HSCT.
KeywordsHaploidentical hematopoietic stem cell transplantation Very low-dose antithymocyte globulin Relapsed/refractory acute leukemia
Compliance with ethical standards
This study was conducted in accordance with the Declaration of Helsinki and was approved by the ethics committee of Tokyo Metropolitan Cancer and Infectious Diseases Center, Komagome Hospital (approval number 1985).
Conflict of interest
The authors declare that they have no conflicts of interest.
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