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ECOG PS: Eastern Cooperative Oncology Group performance status; tub: tubular adenocarcinoma; pap: papillary adenocarcinoma; por: poorly differentiated adenocarcinoma; muc: mucinous adenocarcinoma; Ra: middle rectum; Rb: lower rectum; P: proctodeum; CEA: carcinoembryonic antigen; NAC: neoadjuvant chemotherapy without radiation.
