In subgroup analyses, FcγRIIIA polymorphism was significantly correlated with pCR rate in the population who received paclitaxel plus trastuzumab therapy (n=34, P<0.05)…the DFS in FcγRIIIA-158 V carriers genotype group were significant longer than that in FcγRIIIA-158 F/F genotype group in subgroup who received paclitaxel plus trastuzumab therapy (n=34, P=0.036)....FcγRIIIA polymorphism is predictive of trastuzumab efficacy in the neoadjuvant setting of HER2-positive breast cancer patients who received paclitaxel plus trastuzumab therapy.