Clinical Research Directory

Inclusion Criteria: 1. The pathological diagnosis was newly diagnosed non-keratinizing squamous cell carcinoma nasopharyngeal carcinoma. 2. The clinical stage is T1-4N0-3M0 (stage I\~IVa, UICC/AJCC 8th edition); 3. There is no history of hypothyroidism or hyperthyroidism before treatment; 4. Using intensity-modulated radiotherapy technology, 5. Complete radical dose radiotherapy; 6. KPS≥70 points; 7. Age 18-70 years old; 8. Male or female who is not pregnant or lactating; 9. Hematological examination: white blood cells \> 4×109/L, neutrophils \> 2×109/L, hemoglobin \> 90g/L, platelets \> 100×109/L; 10. Liver function: ALT, AST \< 1.5×ULN, ALP \< 2.5×ULN, bilirubin \< ULN. 11. Renal function: creatinine \> 60 ml/min; 12. The patient signs the informed consent form; Exclusion Criteria: 1. WHO pathological classification is keratinizing squamous cell carcinoma or basaloid carcinoma; 2. palliative treatment; 3. Have a history of other malignant tumors; 4. Pregnant or lactating women (women of childbearing age should consider taking a pregnancy test, and patients are required to use effective contraception during treatment); 5. Have a history of neck surgery; 6. Have a history of hyperthyroidism or hypothyroidism. 7. Previous history of head and neck radiation therapy;