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Background  Aspiration pneumonia is one of the most important side effects of chemoradiotherapy (CRT) and bio-radiotherapy (BRT) in patients with head and neck cancer (HNC). Aspiration pneumonia can lead to cancer-related mortality in HNC patients. However, the relationship between aspiration pneumonia occurring during CRT or BRT for HNC and treatment outcomes in HNC patients is not well characterized. In this study, we assessed the influence of aspiration pneumonia on treatment outcomes and sought to identify the clinical risk factors for aspiration pneumonia during definitive CRT and BRT in HNC patients.    Methods  We retrospectively assessed the data pertaining to patients with locally advanced HNC who received definitive CRT or BRT at the Shizuoka Cancer Center between August 2006 and December 2016.    Results  Among the 374 HNC patients who received CRT or BRT, 95 (25.4%) developed aspiration pneumonia during treatment. Aspiration pneumonia was significantly associated with therapeutic response to CRT or BRT (multivariate adjusted odds ratio for complete response, 0.52,  p  = 0.020) and poor overall survival (multivariate adjusted hazard ratio for overall survival, 1.58,  p  = 0.024). The multivariate analyses identified four independent factors for aspiration pneumonia: poor oral hygiene, high N-classification, hypoalbuminemia before treatment, and inpatient treatment.    Conclusions  Aspiration pneumonia occurring during CRT or BRT has a detrimental effect on the therapeutic response and survival of HNC patients. Careful attention should be paid to these risk factors for aspiration pneumonia in HNC patients undergoing CRT or BRT.

Risk factors for aspiration pneumonia during concurrent chemoradiotherapy or bio-radiotherapy for head and neck cancer