CD8A and cancer: Cancer patients containing high levels of tumor-infiltrating CD8+ cells ( > 13) had significantly low mortality and relapse with cumulative hazards of 0.1 and 0.05, respectively throughout the entire 5 year follow-up, whereas patients containing low levels of CD8+ cells (≤13) may die or relapse with a cumulative hazard of 0.7 (Figure 6B).