
This study examined the occurrence and risk factors of early thyroid dysfunction in nasopharyngeal carcinoma (NPC) patients following intensity-modulated radiation therapy (IMRT). A total of 132 NPC patients were analyzed, with 42.4% experiencing hypothyroidism and 12.9% developing hyperthyroidism within 1 year after IMRT. The median time for hypothyroidism onset was 9 months, while hyperthyroidism appeared within 1 month. Subclinical hypothyroidism was the most common subtype observed. Age, clinical stage, thyroid volume, and V45 (a dose parameter) were identified as independent risk factors for early radiation-induced hypothyroidism in NPC patients. Patients below 47 years, with stage III/IV disease, or pre-irradiation thyroid volume less than 14 ccm, faced a higher risk of developing hypothyroidism.
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