Among the candidate prognostic genes, the roles of APOD, SLITRK2, ADCYAP1, KCNA1, GDF6, CYP1B1, FABP4, MYB, and SYT4 in the progression of GC have been tested in prior studies [19,20,21,22,23,24,25,26,27].Therefore, we focused on the MMRN1 gene, which was ranked high in the risk score of the GC prognostic model established in this study. This evidence concerns the gene KCNA1 and gastric cancer.