COL1A1 and gastric adenocarcinoma: Previous studies have shown that the process, development, and prognosis of STAD were related to some gene expressions, including MKI67, PLK1, COL1A1, TPX2, COL1A2, SPP1, LCP1, FN1, COL1A1, and SERPINE1 (Huang et al., 2020; Zeng Q. et al., 2021; Zhao et al., 2021).