Additionally, GPX4 expression was significantly correlated with the infiltration of cancer-associated fibroblasts (CAFs) in ESCA, HNSC, STAD, and TGCT, neutrophils in CESCs and HNSCs, B cells in HNSC-HPV+ and TGCT, CD8+ T cells in HNSC-HPV+, and regulatory T cells (Treg) in HNSC (Figures 6B, C, Supplementary Figures S6A–C). Here, CD8A is linked to cancer.