Placebos
DrugDrug 1:
Placebo(Sodium Chloride Injection),7.5mg/m2 on d1-d14 in each 21-day cycle(stop interventing until the disease progress)
Drug 2:
Vinorelbine-Cisplatin:
Vinorelbine, 25mg/m2, iv, on d1 and d8 in each 21-day cycle (no more than 4 cycles); Cisplatin,75mg/m2, iv, on d1 in each 21-day cycle(no more than 4 cycles)
Other names: Sodium Chloride Injection