Prognostic value of preoperative and postoperative serum CEA in colorectal signet ring cell carcinoma - Zheng, Yanan; Luo, Yang; Ji, Zuhong; Pan, Ying; Wang, Xiaohong; Liu, Fang; Liu, Lei; Shen, Shanshan; You, Qiang; Ling, Tao (Frontiers in Surgery, 2025)