Association between smoking during radiotherapy and prognosis in head and neck cancer: a follow-up study.


BACKGROUND The study objective was to confirm a previous finding that patients with stage III/IV squamous head and neck cancer (SHNC) who smoke during radiotherapy (RT) experience reduced survival. METHODS An observational cohort study. Patients' smoking status was assessed weekly by questionnaire plus blood cotinine. Patients were assessed every 3 to 4… (More)