The Zhang.CD8.TCS signature was the best correlate to PFI within five cancer types (KIRC, KIRP, LUAD, PCPG, PRAD) and Tang_Ferroptosis in four (BLCA, HNSC, KICH, SARC) (Fig. 4B, Table 4).15, 16 The number of shared genes across top correlates for cancer type was 20.2% (n = 223/1106). The gene discussed is CD8A; the disease is cancer.