Eleven PIGs (ZAP70, PTPRC, LCK, ICOS, CD3E, CD3G, CD3D, ITK, CD247, CD40LG, and GRAP2) were mainly shared by the 6 cancer types (BRCA, CESC, HNSC, LUAD, SARC, and LGG) involved in the TCR signaling pathway. Here, ICOS is linked to cancer.