Moreover, expression of CD9, COL3A1, COL4A1 were related to prognosis of the patients through univariate Cox analysis and we finally determined that peritoneal metastasis, lnc-TRIM28-14 and COL3A1 expression could be independent risk factors for assessing the prognosis of patients with gastric cancer using multivariate Cox analysis (Table S8). This evidence concerns the gene COL3A1 and gastric cancer.