Hydroxychloroquine Sulfate Tablets for Radiation-induced Oral Mucositis

Inclusion Criteria: * Patients pathologically diagnosed with non-metastatic head and neck malignant tumors * Aged 18-80 years * Eastern Cooperative Oncology Group performance status of ≤2 * Planning to receive definitive RT or postoperative adjuvant RT * Normal liver, kidney and bone marrow function * Sign informed consent Exclusion Criteria: * Those who are known to be allergic to 4-aminoquinoline compounds or have more serious allergic constitution * Had a history of head and neck radiotherapy * Patients with non head and neck parts in the radiotherapy area * Poor oral hygiene or severe periodontitis * Suffering from severe kidney disease, severe cardiovascular disease, myasthenia gravis, Parkinson's disease or epilepsy * Recently taking or taking diuretics or other drugs known to interact with hydroxychloroquine sulfate tablets * Retinopathy * Other patients (combined with any serious other diseases) who the investigator believes are not suitable for participation in this study