Data from the following presentations are discussed:
Combination of ponatinib and blinatumomab in Philadelphia chromosome-positive acute lymphoblastic leukemia: Early results from a phase II study. (Short, ASCO 2021 Abstract 7001)
Efficacy: 28 patients (currently 38 at the time of this interview) with either newly diagnosed (ND) or relapsed/refractory (R/R) Philadelphia chromosome-positive (Ph+) acute lymphoblastic leukemia (ALL) were enrolled in the phase II study. 100% of ND patients responded to treatment compared to 88% of R/R patients. A complete molecular response was noted in 86% of enrolled patients (87% in ND vs 86% in R/R patients). A greater treatment benefit was noted in the ND cohort with an estimated 1-year overall survival (OS) and event-free survival rate of 94% and 88%, respectively. This is compared to the 88% and 55% OS and event-free survival rates noted in the R/R patient cohort.
Safety: Treatment with ponatinib was well tolerated in both patient cohorts with only grade 1-2 side effects noted. Treatment with ponatinib was not discontinued due to toxicity in any patient.