Preservation of Swallowing in Respected Oral Cavity Squamous Cell Carcinoma: Examining Radiation Volume Effects (PRESERVE): A Randomized Trial

Inclusion Criteria: * Willing to provide informed consent * ECOG performance status 0-2 * Histologically confirmed, resected oral cavity squamous cell carcinoma with at least ipsilateral selective neck disection * Patient has pathological features that are indications for PORT: positive or close (≤ 3 mm) margin, presence of LVI or PNU, pT3 or pT4 disease, positive lymph nodes, and PORT is recommended by treating physician * Pathologically lympth node negative in at least one dissected hemi-neck with at least 10 nodes recovered in each pN0 hemi-neck Exclusion Criteria: * Serious medical comorbidities or other contraindications to radiotherapy * Prior history of head and neck cancer within 5 years * Any other active invasive malignancy, except non-melanotic skin cancers * Prior head and neck radiation at any time * Prior oncologic head and neck surgery in the oral cavity or neck * Metastatic disease * Locoregional disease recurrence identified following surgical resection but prior to the start of radiotherapy * Inability to attend full course of radio therapy or follow-up visits * Unable or unwilling to complete QoL questionnaires * Pregnant or lactating women