Very late xerostomia, dysphagia, and neck fibrosis after head and neck radiotherapy.

Background Acute and late toxicity after intensity-modulated radiotherapy (IMRT) for head and neck cancer (HNC) impacts on patient quality of life; yet, very late toxicity data remain scarce. This study assessed dysphagia, xerostomia, and neck fibrosis 3-8 years after IMRT. Methods A retrospective analysis using generalized estimated equations was performed on 60 patients with HNC treated with fractionated IMRT between 2000 and 2015 who had a follow-up >= 8 years. Toxicity was scored using LENT-SOMA scales. Results A trend towards a nonlinear global time effect (P = .05) was noted for dysphagia with a decrease during the 5 years post-treatment and an increase thereafter. A significant decrease in xerostomia (P = .001) and an increase in neck fibrosis (P = .04) was observed until 8 years. Conclusions Dysphagia, xerostomia, and neck fibrosis do not appear stable over time and remain highly prevalent in the very late follow-up. Our findings support the need for prospective trials investigating very late toxicity in patients with HNC.