The treatment cycle will be repeated every 4 weeks. Dexamethasone will be given before and after each docetaxel infusion to prevent hypersensitivity and fluid retention. Tumor response will be evaluated every 2 cycles. For patients with inoperable locally advanced disease on entry, those who achieve clinical complete (CR) and partial (PR) response will be evaluated for the feasibility of curative surgical resection.If pathological CR is documented, at least 2 cycles of chemotherapy will be given after surgery. If microscopic residual tumor is noted after curative surgery, protocol treatment will be continued until disease progresses or intolerable toxicities develop. For patients with metastatic diseases on entry, those who achieve CR will receive at least 2 more cycles of chemotherapy after documentation of CR. Patients with PR will continue protocol treatment until disease progresses or intolerable toxicities develop. Patients with stable disease will continue protocol treatment if there are minor tumor responses or improvement of their general condition; patients will stop protocol treatment and change to salvage therapy if no any clinical benefits are observed. Patients with progressive disease should stop protocol treatment and change to salvage therapy.