DPP4 and neoplasm: At the cellular landscape, NLGN2 correlated significantly with signatures of crucial subpopulations of tumor-infiltrating lymphocytes (29), including but not limited to cytotoxic T cells (CD3/CD8) (Figure 4C), helper T cells (CD3/CD4) (Figure 4D), B cells (CD19/CD20) (Figure 4E), macrophages (CD14/CD11b/HLA-DR) (Figure 4F), NK cells (CD16/CD56/NKG2D) (Figure 4G), and dendritic cells (CD135/Flt3/CD117/CD26/CD103) (Figure 4H).