Meanwhile, the Kaplan-Meier curves unraveled that a lower infiltration of CD8+ T cells predicted a worse OS (Figure S6D) and BC patients with high-risk scores and low infiltration level of CD8+ T cells had the shortest survival time (Figure S6E), demonstrating that the infiltration of CD8+ T cells may serve as a protective factor in BC prognosis. This evidence concerns the gene CD8A and breast cancer.