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To investigate the effects of three-dimensional conformal radiotherapy (3DCRT) and intensity-modulated radiotherapy (IMRT) on parotid gland function and quality of life in patients with nasopharyngeal carcinoma (NPC). Ninety-six patients with NPC diagnosed and treated in our hospital were divided into two groups using a random number table. The control group was treated with three-dimensional conformal radiotherapy and the research group was treated with intensity-modulated radiotherapy. Observation and comparison were conducted for differences of b