Wakatsuki, K et al. and Hasuo, T et al. divided GC into the gastric phenotype (G-type) and intestinal phenotype (I-type) according to MUC5AC, MUC6, MUC2, and CD10 [30,31], while other scholars divided G-type and I-type according to MUC2 with other proteins [20,32]. This evidence concerns the gene MUC5AC and gastric cancer.