Based on independent radiology review of the treated population , 25/40 patients ( 63 % ) in Arm A and 9/23 ( 39 % ) in Arm B had PFS4mo ; the median PFS was 5.1 mo ( 95 % CI , 3.9 , 6.5 ) vs 3.4 mo ( 2.5 , 6.7 ) .