In Arm B A 840mg IV was added every 14 days from cycle 2 onwards, responding pts continued with A at 840mg every 21 days for 8 cycles....In Arm B, ORR, PFS and OS were higher in tumours with gain of PD-L1 locus at 9p by FISH (10/29), median PFS 7.2 months 9p gain vs 3.2 months normal P = 0.037…