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Association between PD-L1 expression prior to neoadjuvant CRT and Dworak tumor regression grade. CPS: combined positive score; CRT: chemoradiotherapy; IC: immune cell score; PD-L1: programmed death-ligand 1; TPS: tumor proportion score. * Outliers above quartile 3 (Q3) + 1.5× interquartile range. * Outliers above quartile 3 (Q3) + 3× interquartile range.
