Clinical Research Directory

Inclusion Criteria: 1. Willingness to provide written informed consent. 2. Pathologically confirmed diagnosis of nasopharyngeal carcinoma 3. Age ≥18 years 4. ECOG performance status 0-1 5. Patients with AJCC v.9 stage I-III disease who undergo chemoradiotherapy 6. Adequate bone marrow, liver, and renal function within 4 weeks before study registration * Hemoglobin ≥ 9.0 g/dL * Absolute neutrophil count (ANC) ≥ 1,000/mm3 * Platelet count ≥ 50,000/μL * Total bilirubin \< 2.5 mg/dL * Serum albumin \>2.8 g/dL * Serum creatinine ≤ 1.5 mg/dL Exclusion Criteria: 1. Presence of distant metastasis 2. Patients with AJCC v.9 cT1N0M0 disease who undergo radiotherapy alone. 3. Synchronous or prior invasive malignancy, unless disease-free for at least 2 years. 4. Prior radiotherapy to the head and neck region 5. Presence of severe major organ dysfunction 6. Pregnant women or women of childbearing potential who are unwilling to use medically acceptable contraception.