The 5-year OS rate was 75.7 % [ 95 % confidence interval ( CI ) 66.4 % to 82.8 % ] for Arm Z and 65.8 % ( 95 % CI 56.2 % to 73.8 % ) for Arm P ( P = 0.07 ) ; hazard ratio was 0.65 ( 95 % CI 0.40-1 .04 ) .