CD8A and cancer: MSI cancers had higher mean CD8+ T cell counts when compared to MSS cancers (88.0 vs. 30.4/hpf, P<0.0001) (Figure 1), and this difference was present between MSI and MSS cancers from African American patients (76.8 vs 32.2/hpf, P = 0.0057) and from Caucasian patients (95.5 vs. 29.5/hpf, P<0.0001) (Figure 2).