Swallowing beyond six years post (chemo) radiotherapy for head and neck cancer; a cohort study

Objective: The objective of this prospective study is to report on long-term swallowing outcomes in a group of head and neck cancer patients following (chemo) radiotherapy treatment, assess for changes over time and identify any predictor variables of outcome. Materials and methods: 42 survivors were assessed on four swallowing measures and followed up from pretreatment to six years post 3D (chemo) radiotherapy. Measures included a swallowing specific QOL questionnaire, penetration-aspiration scale, dietary restrictions and a timed water swallow test. Results: At six years, 71% reported swallowing difficulties on the questionnaire. One fifth of patients had aspiration, with a raised risk of chest infection. Seven percent required a laryngectomy for a dysfunctional larynx. Despite this, half the group reported having a normal diet. There was variation in the pattern of change between one and six years. A significant deterioration was only observed in the timed water swallow test (p < 0.0001). Larger radiotherapy volume predicted this outcome. None of the variables tested predicted outcome for the other three swallow measures. Conclusion: Patients continue to report swallowing difficulties at six years, with a proportion having persistent aspiration. Further work on identifying the risk factors associated with aspiration tolerance, aspiration pneumonia, prevention and management is warranted. Long-term dysphagia remains a significant and serious concern following (chemo) radiotherapy for HNC and swallowing outcomes should continue to be monitored over time.