EVASION OF IMMUNE RESPONSES BY TUMORS (1)Escaping Immune Recognition by Loss of Antigen Expression MHC NO NO THand Te activation Mutations in MHC genes or genes Lack of Neo-antigens needed for antigen processingEVASION OF IMMUNE RESPONSES BY TUMORS Lack of Neo-antigens Mutations in MHC genes or genes needed for antigen processing （1）Escaping Immune Recognition by Loss of Antigen Expression