A Randomized, Double-blind Study to Evaluate the Clinical Effect and Safety of Fucoidan in Patients With Squamous Cell Carcinomas of the Head and Neck

Inclusion Criteria: 1. The patients with stage III/IV head and neck squamous cell carcinoma (HNSCC) withoutdistant metastasis who had not received any treatment to head and neck cancer can be enrolled in this study. 2. Completed a computed tomography (CT) or magnetic resonance imaging (MRI) scan of the head and neck (including the primary tumor and neck nodes) within 6 weeks prior to enrollment. 3. Adequate renal function, with serum creatinine ≤ 1.5 mg/dL. Patients with serum creatinine \> 1.5 mg/dL may be eligible if calculated creatinine clearance ≥ 55 mL/min as based on the results of the Cockcroft-Gault Equation or 24-hour urine collection. 4. Age ≥ 20 years and ≤ 75 years. 5. Eastern Cooperative Oncology Group (ECOG) Performance Status = 0-1. 6. Expected lifespan \> 6 months. 7. Adequate bone marrow function, as defined by absolute neutrophil count ≥ 1,500/μL, platelet count ≥ 100,000/μL, and hemoglobin ≥ 9 g/dL. 8. Adequate hepatic function, with total bilirubin ≤ 1.5 × upper normal limit (UNL; patients with hyperbilirubinemia caused by Gilbert's syndrome may be eligible if total bilirubin ≤ 2.5 × UNL), aspartate aminotransferase (AST) ≤ 2.5 × UNL, alanine aminotransferase (ALT) ≤ 2.5 × UNL, and alkaline phosphatase (ALP) ≤ 2.5 × UNL. 9. Men and women of childbearing potential must consent to the use of effective contraception while on treatment period. 10. Patients must be able to understand and be willing to sign a written informed consent document. 11. Patients must be able to comply with the study protocol. Exclusion Criteria: 1. Diagnosed as nasopharyngeal cancer. 2. Body mass index (BMI) \< 18.5. 3. Significant history of cardiac disease (i.e. uncontrolled hypertension, unstable angina, congestive heart failure, or uncontrolled arrhythmias, etc.). 4. Patients with a history of any other malignancy (except squamous or basal cell skin cancer or cervical carcinoma in situ) are ineligible, unless the patient has been continuously disease-free for at least 5 years. 5. Previously received chemotherapy, radiation therapy, or immunotherapy for head and neck cancer. 6. Dysphagia patients who do not consent to nasogastric (NG), orogastric (OG), or percutaneous endoscopic gastrostomy (PEG) feeding. 7. History or clinical evidence of any hyperthyroidism, cirrhosis, hepatic failure, human immunodeficiency virus (HIV) infection, renal failure (as determined by a serum creatinine \> 250 µmol/L or \> 2.83 mg/dL at screening), active tuberculosis (as confirmed by sputum or other microbiological methods within the last five years), or active hepatitis B/C. 8. Any other clinical disorders or unsuitable conditions that render the patient ineligible for this study, as determined by the principal investigator(s). 9. Treatment with any investigational product or health supplement within 28 days prior to enrollment. 10. Pregnant or breastfeeding women. 11. Non-compliance with the requirement for contraception or other aspects of the study protocol. 12. Inability to understand and provide informed consent regarding participation in this study.