PTPN2 and neoplasm: PTPN2 deletion increases IFN-γ-induced STAT1 phosphorylation, expression of antigen processing and/or presentation related molecules (Tap1, Tapbp, B2m, MHC-I, and MHC-II), as well as expression of some chemokines (Cxcl9, Cxcl10, Cxcl11, and Ccl5), which recruit T cell infiltration into the tumor.