Pts received zenocutuzumab (750 mg, 2h IV), trastuzumab (8 mg/kg loading, then 6 mg/kg), and vinorelbine (25 mg/m², D1 and 8), q3w....In the 37 pts evaluable for efficacy and with locally confirmed HER2 overexpression (3+ IHC or 2+ IHC confirmed by FISH), CBR at 24 w per investigator was 49% (90% CI: 34-63%); ORR was 27% (95% CI: 15-42%)….Updated analyses confirm that the efficacy of zenocutuzumab combinations with trastuzumab/vinorelbine in heavily pretreated, HER2+ MBC, with progression after TDM-1, met prespecified protocol criteria for success.