摘要Objective:To study the correlation of serum sLAG-3, PARP-1 and CA50 levels with oncogene expression in surgically removed lesions in patients with gastric cancer.Methods: A total of 98 patients who were diagnosed with gastric cancer in Zhouzhi County People's Hospital between June 2015 and March 2017 were selected as the gastric cancer group of the research, and 60 healthy volunteers who received physical examination during the same period were selected as control group of the research. The serum was collected from the two groups to determine sLAG-3, PARP-1 and CA50 levels; gastric cancer lesions and adjacent lesions were collected from gastric cancer group to determine the protein expression of PDCD4, RASSF1A, p16ink4a, Kiss-1, Eaf-2, CDC4, UHRF1, OCT4, Zeb-1 and c-jun.Results:Serum sLAG-3, PARP-1 and CA50 levels of gastric cancer group were significantly higher than those of control group, and the higher the TNM stage, the higher the serum sLAG-3, PARP-1 and CA50 levels; PDCD4, RASSF1A, p16ink4a, Kiss-1, Eaf-2 and CDC4 protein levels in gastric cancer lesions were significantly lower than those in adjacent lesions and negatively correlated with serum sLAG-3, PARP-1 and CA50 levels, while UHRF1, OCT4, Zeb-1 and c-jun protein levels in gastric cancer lesions were significantly higher than those in adjacent lesions and positively correlated with serum sLAG-3, PARP-1 and CA50 levels.Conclusions:The increase in serum sLAG-3, PARP-1 and CA50 levels in patients with gastric cancer is closely related to the pathological process of gastric cancer, deletion of tumor suppressor gene expression and increase of proto-oncogene expression.