Eligible patients must receive vinorelbine plus capecitabine, with or without trastuzumab, until disease progression or unbearable toxicity. Cycles will be administered every 3 weeks. HER2 status must be locally assessed by immunohistochemistry (IHC). All 3+ patients are eligible. In 2+ patients, HER2 status must be confirmed by fluorescence in situ hybridization (FISH).