An ambispective analysis will be conducted at a tertiary cancer care centre over a period of 2 years. All patients with oral cancer who have been treated or planned to be treated primarily by surgery and are satisfying the inclusion and exclusion criteria will be included in the study. The patient details, height, weight, BMI, blood parameters, HPE , clinical - radiological reports will be retrieved from the medical records department to ascertain eligibility and the pre-operative CT scans will be retrieved from the department of radiology,for the retrospective group of patients. For the prospective group patient, patient details , height, weight, BMI, will be taken preoper preopratively within 3 months of surgery. Preoperative scans will be done . Muscle function will be assessed preoperatively by hand grip test, chair test, gait test. The date and type of surgery will be recorded. The postoperative period will be reviewed with the records and with the patients for any complications. The patients in the retrospective group will be called to follow up whereas the patients in the prospective group will be followed up as per NCCN follow-up protocol. They will be followed up every month for the first year and every 2nd month for the second year. Thereafter, follow-up will be scheduled every 6 months till the 5th year and once a year after that. The Quality of Life (QoL) will be assessed using previously validated questionnaires (SARC-F). The patient who has received PORT will be assessed for short-term and long-term radiation toxicity using Common Terminology Criteria for Adverse Events (CTCAE) v4.0 and criteria of Radiation Therapy Oncology Group (RTOG).