Dysphagia, hypothyroidism, and osteoradionecrosis after radiation therapy for head and neck cancer

OBJECTIVES: To analyze the long‐term side effects of radiation therapy (RT) for head and neck cancer (HNC). METHODS: Retrospective chart analysis of all 688 HNC patients treated during 2010–2015 at Turku University Hospital, Finland. All patients who survived for more than a year after RT/chemoRT were included (n = 233). Intensity modulated RT (IMRT) with standard fractionation was applied in each case. RESULTS: One hundred and six patients (45%) reported persisting dysphagia, for which neck RT increased risk. Definitive neck RT to high‐risk volume did not increase late toxicity risks compared to elective neck RT. Radiation‐induced hypothyroidism (29%, n = 67) was more common among younger patients and females. Osteoradionecrosis (12%, n = 29) was more common in the oral cavity cancer group (20.7%, n = 92) compared to all other subsites. CONCLUSIONS: Late toxicities of RT for HNC are common. Age, gender, tumor subsite, and neck RT affect susceptibility to long‐term side effects. LEVEL OF EVIDENCE: 4.