Patient and tumor characteristics (n = 125).

Values are presented as median (range) or number (%).SPS, sphincter preserving surgery; APR, abdominoperineal resection; NCRT, neoadjuvant chemoradiotherapy; CEA, carcinoembryonic antigen; LN, lymph node; LNR, lymph node ratio; CRM, circumferential resection margin; TRG, tumor regression grade; WD, well differentiated; MD, moderately differentiated; PD, poorly differentiated.Patient and tumor characteristics (n = 125).数据以中位数（范围）或例数（百分比）的形式呈现。SPS：括约肌保存术（sphincter preserving surgery）；APR：腹会阴联合切除术（abdominoperineal resection）；NCRT：新辅助放化疗（neoadjuvant chemoradiotherapy）；CEA：癌胚抗原（carcinoembryonic antigen）；LN：淋巴结（lymph node）；LNR：淋巴结比率（lymph node ratio）；CRM：环周切缘（circumferential resection margin）；TRG：肿瘤退缩分级（tumor regression grade）；WD：高分化（well differentiated）；MD：中分化（moderately differentiated）；PD：低分化（poorly differentiated）。患者与肿瘤特征（n = 125）。