Outcome of Philadelphia Positive Acute Lymphoblastic Leukemia With or Without Allogeneic Stem Cell Transplantation in a Retrospective Study

Philadelphia positive ALL (Ph + ALL) is an aggressive leukemia associated with lower remission rates and poor survival. Current treatment approach for Ph + ALL is chemotherapy along with TKI and CNS directed therapy followed by Allogeneic stem cell transplantation (Allo-SCT). To analyze outcome of Ph + ALL with or without Allo-SCT in the era of universal TKI uses. Retrospectively reviewed medical records of 267 patients who were diagnosed and treated for ALL during study period at our centre. Fifty-one Ph + ALL patients (males = 31, females = 20) out of a total of 267 ALL patients were eligible for the study. Post induction 48 patients achieved complete remission while 1 died during induction. Forty-six patients received further treatment with TKI + CNS directed therapy and thereafter the consolidation therapy with Allo-SCT (n = 16) or chemotherapy + TKI (n = 30).Overall mortality was 7/51 (13.9%) (6/16 transplant related mortalities due to GVHD and infections and 1 induction death). Fifteen out of 46 patients (32.6%) had relapse (1/10 relapse after Allo-SCT vs. 14/24 after chemotherapy) on or after consolidation therapy. At a median follow-up of 17.5 months (2-58 months) of cohort, the median EFS was 22 months (95% CI 10.4-33.5 months). The estimated 4 year EFS and PFS in Allo-SCT versus chemotherapy only group was 36.0 ± 17.9 versus 27.3 ± 9.1% (p = 0.21) and 75 ± 21.7 versus 34.1 ± 10.9% (p = 0.02) respectively. Allo-SCT groups has a better progression free survival than chemotherapy group only. Preventing treatment related mortality can further improve outcome after Allo-SCT Ph + ALL.