We analyzed the expression profiles of immune cell markers in GEPIA and the results showed makers of T cells (CD3D, CD3E, and CD2) (Figures 5A–C), B cells (CD79A and CD19) (Figures 5D,E), dendritic cells (HLA-DPB1, HLA-DQB1, and HLA-DRA) (Figures 5F–H), and monocytes (CD86 and CSF1R) (Figures 5I,J) are overexpressed in gastric cancer samples compared with normal controls. Here, HLA-DQB1 is linked to gastric cancer.