Figure 12C shows that in the foundation of the foregoing prognostic model, the TRAC gene mostly promotes tumor growth in OSCC patients by regulating T cells in several directions (upregulating CD8, driving naive CD4 T cells to convert to activated CD4 T cells, and inducing macrophages M0 to convert to macrophages M1 and M2). This evidence concerns the gene CD8A and neoplasm.