We reviewed the details of infiltrating immune cells in the two gene clusters and found that anti-cancer immune cells, such as CD8 T cells, activated memory CD4 T cells and M1 macrophages, were elevated in gene cluster B, and the volume of immune-regulating cell-like regulatory T cells (Tregs) was increased in gene cluster A. The component variations partially explained the survival variations between different gene clusters. Here, CD8A is linked to cancer.