Morbidity in Patients with Nasopharyngeal Carcinoma and Radiation-Induced Skin Lesions: Cause, Risk Factors, and Dermatitis Evolution and Severity

Radiation-induced skin injuries such as lesions (RSLs) and dermatitis are the most common complication during radiotherapy (RT) for nasopharyngeal carcinoma, but little is known about risk factors unique to oncology. This study sought a greater understanding of these risk factors to stratify patients based on risk and guide clinical decision-making.Investigators analyzed the data of 864 consecutive patients referred to the RT center of the Southern Theater General Hospital for a new RSL from 2013 to 2019. These patients were followed up for an average of approximately 16 months until their death or March 30, 2020, whichever came first. Multivariate logistic regression analysis and Cox proportional hazards model were used to identify predictors of grade 3 or 4 dermatitis.The main causes of treatment interruption included dermatitis and oral mucositis. Significant patient-specific risk factors for RSLs included current smoking, current drinking, and lower Karnofsky Performance Scale score and significant procedure-specific risk factors included receiving intensity-modulated radiation therapy (IMRT), hyperfractionated RT, induction chemotherapy, multicycle chemotherapy, and taxol- and cisplatin-based drugs. The three factors that independently predicted risk of RSL were IMRT, lower Karnofsky Performance Scale score, and multicycle chemotherapy. Comparing predictive factors among patients with severe RSL revealed that patients who received IMRT were more likely to develop grade 3 or 4 dermatitis.Oncology providers should note that IMRT is an aggressive technique with a trend toward increased RSL. Providers should pay special attention to adverse effects to skin in patients with nasopharyngeal carcinoma.