Haploidentical hematopoietic stem cell transplantation following myeloablative conditioning regimens in hematologic diseases with G-CSF-mobilized peripheral blood stem cells grafts without T cell depletion: a single center report of 38 cases.

Many Chinese patients with hematologic diseases, who need allogeneic hematopoietic stem cell transplantation (HSCT), lack a human leukocyte antigen-matched donor. To save these patients and to avoid collecting donor bone marrow graft, we adopted haploidentical peripheral blood HSCT with granulocyte colony stimulating factor (G-CSF) mobilized peripheral blood stem cells as the grafts without ex vivo T cell depletion. Thirty-eight patients were enrolled, and they received myeloablative preconditioning. Thirty-five patients attained a successful neutrophil and platelet recovery. The median time for the neutrophil recovery was 16 days (range of 10-23 days), and the median time for the platelet recovery was 19 days (range of 10-66 days). During the follow-up at a median time of 33.1 weeks (range of 1.1-412.6 weeks), eleven (28.9 %) patients developed aGVHD grade I-II and seven (18.4 %) patients developed aGVHD grade III-IV. The incidence of cGVHD was 27.6 %, and nine (23.7 %) patients died within the first 100 days after transplantation. The cumulative survival proportions at 1 and 2 years were 52.51 ± 8.57 % and 43.76 ± 9.11 %, respectively. These results suggested that the G-CSF-primed peripheral blood stem cell grafts, without in vitro T cell depletion, could be an appropriate stem cell source for Haplo-HSCT.