Prophylactic Radiotherapy Optimization for Enhanced Thyroid Function Protection in NPC

Exclusion criteria

• ✕. History of other malignant tumors (excluding basal cell carcinoma/squamous cell carcinoma of the skin or cervical carcinoma in situ);
• ✕. History of radiotherapy (excluding radiotherapy outside the planned target area for conditions such as melanoma);
• ✕. History of neck surgery;
• ✕. Any severe comorbidities that may pose risks to the study or affect compliance, such as unstable heart disease requiring treatment, kidney disease, chronic hepatitis, poorly controlled diabetes (fasting blood glucose \> 1.5 × ULN), or psychiatric disorders;
• ✕. History of hyperthyroidism, hypothyroidism, or immune-related thyroid disorders;
• ✕. Other family or social factors, as judged by the investigator, may force the study's early termination, compromise patient safety, or affect the collection of trial data.