The purpose of this study is to investigate the impact of different neoadjuvant chemotherapy schedules of cisplatin and 5-FU on acute toxicity, tumor response, and long-term survival in patients with advanced nasopharyngeal carcinoma

Control group: Neoadjuvant chemotherapy with tri-weekly PF × 3 cycles (cisplatin 100 mg/m2, day 1, followed by 5-FU 1000 mg/m2/d, days 1-4 continuous iv infusion, repeated every 3 weeks) + IMRT ≧ 70 Gy/35 fractions

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

Inclusion Criteria:

1. Histological proven NPC.
2. 2010 AJCC stage II-IVB.
3. Age ≧ 20 years old.
4. Performance status of ECOG ≦ 2.
5. Adequate liver, renal, and bone marrow functions 5-1 Serum total bilirubin level ≦ 2.5 mg/dl. 5-2 Serum creatinine ≦ 1.6 mg/dl or calculated CCr ≧ 60 cc/min. 5-3 WBC ≧ 3,000/ul 5-4 Platelet count ≧ 100,000/ul
6. Signed informed consent.

Exclusion Criteria:

1. Presence of distant metastasis.
2. Previous radiotherapy or chemotherapy.
3. History of a malignancy except those treated with curative intent for skin cancer (other than melanoma), in situ cervical cancer, ductal carcinoma in situ (DCIS) of the breast.
4. Severe cardiopulmonary diseases (unstable angina and/or congestive heart failure or peripheral vascular disease requiring hospitalization within the last 12 months; chronic obstructive pulmonary disease exacerbation or other respiratory illness requiring hospitalization) or clinically significant psychiatric disorders.
5. Female patients who are pregnant or lactating.