Five patients were positive for Her3 mutation and/or amplification….At a median follow-up of 6.8 months, median PFS was 4.1 months for chemotherapy only (n = 85) and 9.7 months for trastuzumab with chemotherapy (n = 21) (HR 0.22; P < 0.05). The median OS was 14 and 6 months in patients with or without trastuzumab-based therapy (HR 0.08 P = 0.001), respectively.