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Forest plots on pooled Hazard Ratios (HRs) on smoking during chemoradiotherapy and efficacy. (a) Smoking during chemoradiotherapy and locoregional recurrence free survival; (b) smoking during chemoradiotherapy and disease-free survival. HR > 1 indicates worse outcome for smokers during radiation treatment, whereas HR < 1 indicates better outcome. Comparison group is non-smoker (former or never). Abbreviation: H&N, head and neck cancer.
