Kinases, including MAP2K1 (MEK1), EGFR and RET, were validated as negative regulators of human HLA expression in multiple cancer types, and activated MAPK signaling in mouse tumors in vivo suppressed components of MHC-I, while the pharmacologic inhibition of MAPK signaling led to improved peptide/MHC target recognition and killing by T cells and TCR-mimic antibodies52. This evidence concerns the gene RET and cancer.