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Kaplan-Meier curves demonstrating OS of HNSCC patients treated by radiotherapy (blue line) or chemoradiotherapy (red line). a, b Elderly HNSCC patients aged 65–74 years (a) or ≥ 75 years (b) with definitive treatment. c, d Elderly HNSCC patients with 65–74 years (c) or ≥ 75 years (d) treated in an adjuvant setting
