CDKN2A and leukemia: Methylation of multiple TSGs has involved in the dysregulation of signaling pathways in leukemia, lymphoma and myeloma, including cell cycle (CDKN2A/B), apoptosis (DAPK1/CDKN2A/APAF1), JAK/STAT signaling and WNT signaling; thereby indicating the importance of TSGs methylation in the pathogenesis of hematological cancers [4-6].