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Values are presented as number (%) or mean ± standard deviation. Group 1, persistent elevated s-CEA at 1-year postsurgery; group 2, normalized s-CEA at 1-year postsurgery; s-CEA, serum CEA; LN, lymph node; WD, well differentiated; MD, moderately differentiated; PD, poorly differentiated; SRC, signet ring cell; Muc, mucinous; COPD, chronic obstructive lung disease.
