09Jul 2023
Risk factors of early thyroid dysfunction after definitive radiotherapy in nasopharyngeal carcinoma patients

Risk factors of early thyroid dysfunction after definitive radiotherapy in nasopharyngeal carcinoma patients

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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