Furthermore, we divided GC patients into four groups according to the median of MUC1 and TFF2 expression by using TCGA database, including MUC1 low+TFF2 low, MUC1 low+TFF2 high, MUC1 high+TFF2 low, and MUC1 high+TFF2 high. Here, MUC1 is linked to gastric cancer.