Introduction
NPC, HT
NASOPHARYNGEAL CARCINOMA
Nasopharyngeal carcinoma (NPC) is prevalent in Southern China. Intensity-modulated radiation therapy (IMRT) is the primary treatment, with a 5-year overall survival (OS) rate more than 80% [Several studies have focused on radiation-induced HT. Bhandare et al. indicated that the total dose to the thyroid was significantly associated with clinical primary HT [Sommat et al. [