Median PFS for paclitaxel was 11 months , ixabepilone was inferior to paclitaxel ( PFS , 7.4 months ; hazard ratio , 1.59 ; 95 % CI , 1.31 to 1.93 ; P < .001 ) , and nab-paclitaxel was not superior to paclitaxel ( PFS , 9.3 months ; hazard ratio , 1.20 ; 95 % CI , 1.00 to 1.45 ; P = .054 ) .