Furthermore, results from TISIDB indicated that CDKN2A expression was positively correlated with the abundance of tumor-infiltrating immune cells including Activated CD8 T-cell (Act CD8), Activated CD4 T-cell (Act CD4), T-follicular helper cell (Tfh), Regulatory T-cell (Treg), Activated B cell (Act B), Natural Killer cell (NK), Natural Killer T-cell (NKT), Activated Dendritic Cell (Act DC), Macrophage, Mast cell, Monocyte, and Neutrophil in THCA (Fig. 6B‒C). The gene discussed is CD4; the disease is neoplasm.