HLA-DRA and neoplasm: According to the Pearson’s correlation analysis, the tumor DLK2 level was negatively correlated with the expressions of M1 macrophage markers such as HLA class II histocompatibility antigen, DR α chain (HLA-DRA) (* p = 0.0278), CD11c (integrin α X, ITGAX) (p = 0.0557), and CD86 (p = 0.0783) [49,50] (Figure 11A).