induction chemotherapy: Docetaxel (75 mg/m² administered on D1 of each course, every 3 weeks via one-hour IV infusion) + Cisplatin(75 mg/m² administered on D1 via one-hour infusion )+ 5-FU (750 mg/m²/d administered as a continuous infusion from D1 to D5. The cycles will be repeated every 3 weeks up to a total of 3 courses.