Median PFS was 12.0 months for the CD arm and 12.3 months for CP [ HR = 1.05 ( 95 % CI , 0.79-1 .40 ) ; P = 0.73 for superiority ] and median OS was 40.2 months for CD and 43.9 for CP [ HR = 1.18 ( 95 % CI 0.85-1 .63 ) ; P = 0.33 for superiority ] .