Early Enteral Nutritional Supplementation on Patients With Oral and Oropharyngeal Cancer Undergoing Radio(Chemo)Therapy After Surgical

The target population in the present study is Chinese patients with oral and oropharyngeal cancer who plan to receive radio(chemo)therapy after surgical resection in the outpatient department. Investigators hypothesize that early enteral nutrition intervention, which is initiated 2 weeks before the start of postoperative radio(chemo)therapy treatment and added on demand during radiotherapy, will improve patients' nutritional status, tolerability to the radio(chemo)therapy, quality of life, and other clinical outcomes compared to commencement of oral nutritional supplements during the course of irradiation treatment. There are two cohorts in this trial, cohort 1 included patients with oral nutritional supplements and cohort 2 included patients with tube feeding (nasogastric tube or percutaneous endoscopic gastrostomy).