We downloaded mRNA expression data and clinical information of the TCGA stomach adenocarcinoma program from cBioPortal. Patients with stage I-III gastric adenocarcinoma were included. Exclusion criteria as follows: Patients with preoperative chemotherapy or radiotherapy, or with other malignant tumor. Patients with CEA cell adhesion molecule 5 (CEACAM5, name of gene encoding protein CEA) expression in the top 20% range were divided into high expression group, and the rest 80% were divided into low expression group.

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