The trial is designed to help us to choose the maintain treatment regiment for the patients with effective first-line salvage therapy. After inorelbine and gemcitabine (NG) or vinorelbine and platinum (NP) regiments for 6 cycles, patients will be assess the effect of treatment. As for the patients with complete response (CR), partly response (PR) and stable disease(SD), the investigators will randomly assign them to receive 3 cycles of original regiment, or 6 cycles of vinorelbine, or 6 cycles of capecitabine. Trasuzumab will be used to patients if HER-2 positive. Endocrine therapy will be used if the hormone receptors positive after the chemotherapy. The effectiveness of therapy will be estimated after the maintain therapy. The first two years the patient was prescribed every 3 months to review the disease, then review the disease every six months. The primary endpoint is to assess disease-free survival (DFS), the secondary endpoint is to assess the overall survival (OS).
