PTPRG and cancer: Similar epigenetic regulations have been found for various forms of cancer, such as blocking interactions: ANRASSF1 (RASSF1 antisense RNA)–RASSF1 (tumor-suppressor); ANRIL (antisense noncoding RNA in the INK4 locus)–CDKN2A/B; HOTAIR (HOX transcript antisense RNA)–HOX genes; and PTPRG-AS1 (protein tyrosine phosphatase, receptor type, G, antisense)–PTPRG (tumor suppressor).