In the evaluation cohort, only MUC5AC expression was associated with better OS (hazard ratio [HR] = 0.788, 95% CI, 0.637–0.976, p = 0.029), whereas CDX2, CD10, MUC2, and MUC6 expressions were not significantly associated with the prognosis of gastric adenocarcinoma (all p > 0.05) (Figure 3A). This evidence concerns the gene MUC6 and gastric adenocarcinoma.