220P Correlation research between oral flora diversity and radiation-induced stomatitis after postoperative radiotherapy for oral squamous cell carcinoma

Radiation oral mucositis (radiotherapy-induced oral mucositis, RIOM), as one of the common complications during radiotherapy, is difficult to avoid and predict. Severe RIOM will reduce the quality of life of patients and affect the normal progress of diagnosis and treatment. Early detection and early intervention is very important to reduce the incidence of RIOM, but at present, the sensitivity and specificity of clinical indicators for the occurrence and development of radiation stomatitis are poor, so it is necessary to study further the treatment factors and predictive indicators of radiation stomatitis.