Although the remaining three mRNAs have not been reported by any cancer experiments before, GRID2 was calculated to be significantly down-regulated in endometrial carcinoma by bioinformatics studies, and TF and APOB have not been mentioned by any cancer studies before and were novel candidate prognostic signatures in early-stage STAD reported for the first time by this study. This evidence concerns the gene APOB and endometrial carcinoma.