[The protective effect of optimized target delineation in intensity modulated radiation therapy on swallowing function in patients with different TNM staging of nasopharyngeal carcinoma].

To investigate the protective effect of optimized target delineation in intensity modulated radiation therapy(IMRT) on swallowing function in patients with different TNM staging of nasopharyngeal carcinoma.Fifty patients with nasopharyngeal carcinoma were enrolled in this study. They were randomly divided into 25 cases of experimental group and 25 cases of control group by random number table and received IMRT treatment. Patients in control group only received routine delineation of target areas, the patients in experimental group were given the delineation of the relevant parts of the swallowing on the basis of the control group.And then, the degree of dysphagia, xerostomia, weight loss, and quality of life were assessed in the two groups of patients during and after IMRT.There was no significant change in the degree of dysphagia in stage Ⅱ patients during radiotherapy, but the degree of dysphagia in stage Ⅲ and Ⅳ patients increased with the increase of radiotherapy time. After the end of radiotherapy, there was no significant change in the degree of dysphagia in the control group of patients. Compared with the 0th week after the end of radiotherapy, the stage Ⅱ patients in experimental group showed significant improvement in week 12(<0.05), while the stage Ⅲ and Ⅳ patients showed significant improvement in week 24 after radiotherapy(<0.05). The degree of xerostomia of two groups of patients continued to increase with varying degrees during and after IMRT(<0.05 or <0.01). The weight of the two groups of patients during radiotherapy continued to decrease with the increase of radiotherapy time,and gradually recovered after the end of radiotherapy.And in the experimental group, the weight loss was significantly lower in week 12 and week 24 than in the control group (<0.05). During radiotherapy, the quality of life scores of the two groups became lower and lower with the increase of radiotherapy time compared with the 0th week of radiotherapy. After the end of radiotherapy, the quality of life began to gradually improve, and in week 24 after the end of radiotherapy, the quality of life of the experimental group of patients was significantly higher than that of the control group (<0.05).During radiotherapy of patients with nasopharyngeal carcinoma, the structural organs associated with swallowing function are given individualized target delineation can reduce the occurring of dysphagia due to radiotherapy and improve the quality of life of patients after radiotherapy.