Progression-free survival. (A) PFS in the MPD cohort (n = 52). Twelve patients were censored for PFS because of alternate treatment (6 patients had achieved at least a partial response and decided to pursue other treatment). (B) PFS in the overall study population (N = 84). Nineteen patients were censored for PFS because of alternate treatment (7 patients had achieved at least a partial response and decided to pursue other treatment).