CDKN2B-AS1 and liposarcoma: The promoter region of ANRIL (− 1281 bp to + 20 bp relative to TSS) and the 5′ portion of the p14ARF gene (− 500 bp to + 1125 bp relative to TSS) were fused to the reporter gene Luciferase in the vector pGL3basic, and CpG sites 2, 3, 7 and 9 individually mutated (CpG > TpG) then transfected into the liposarcoma cell line SW-872.