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Kaplan–Meier curves for locoregional control (A, B) and overall survival (C, D) after radiotherapy (RT) or chemoradiotherapy (RT+CT) and stratified according to absence (A, C) or presence (B, D) of necrosis. Test for interaction between necrosis and treatment yielded unadjusted P-value of 0.467 (locoregional control) and 0.0323 (overall survival).
