Test group: Neoadjuvant chemotherapy with weekly P-FL × 10 weeks (cisplatin 60 mg/m2 at days 1, 15, 29, 43, 57; alternatively with 5-FU 2500 mg/m2 + Leucovorin 250 mg/m2 at days 8, 22, 36, 50, 64) + IMRT ≧ 70 Gy/35 fractions