AUTHOR=Zheng Yanan , Luo Yang , Ji Zuhong , Pan Ying , Wang Xiaohong , Liu Fang , Liu Lei , Shen Shanshan , You Qiang , Ling Tao TITLE=Prognostic value of preoperative and postoperative serum CEA in colorectal signet ring cell carcinoma JOURNAL=Frontiers in Surgery VOLUME=Volume 12 - 2025 YEAR=2025 URL=https://www.frontiersin.org/journals/surgery/articles/10.3389/fsurg.2025.1501436 DOI=10.3389/fsurg.2025.1501436 ISSN=2296-875X