REFERENCES: 1. Cooper SL, Brown PA. Treatment of pediatric acute lymphoblastic leukemia. Pediatr Clin North Am 2015; 62 (1): 61-73. 2. Schmiegelow K, Nielsen SN, Frandsen TL, Nersting J. Mercaptopurine/methotrexate maintenance therapy of childhood acute lymphoblastic leukemia: clinical facts and fiction. J Pediatr Hematol Oncol 2014; 36: 503-517. 3. Gujar H, Weisenberger DJ, Liang G. The roles of human DNA methyltransferases and their isoforms in shaping the epigenome. Genes 2019; 10 (2): 172. 4. Keil KP, Vezina CM. DNA methylation as a dynamic regulator of development and disease processes: spotlight on the prostate. Epigenomics 2015; 7 (3): 413-425. 5. Jostes S, Nettersheim D, Schorle H. Epigenetic drugs and their molecular targets in testicular germ cell tumours. Nat Rev Urol 2019; 16 (4): 245-259. 6. Ferrara F, Schiffer CA. Acute myeloid leukaemia in adults. Lancet 2013; 381 (9865): 484-495. 7. DiNardo CD, Cortes JE. New treatment for acute myelogenous leukemia. Expert Opin Pharmacother 2015; 16: 95-106. 8. Vogelstein B, Papadopoulos N, Velculescu VE, Zhou S, Diaz LA, Kinzler KW. Cancer genome landscapes. Science 2013; 339 (6127): 1546-1558. 9. Liu Y-n, Zhang N, Wu Y, Yang L, Ding XY, Zhou JF, et al. DNMT3A mutation analysis in adult patients with acute lymphoblastic leukemia. J Huazhong Uni Sci-Med 2015; 35: 337-342. 10. Eeles RA, Stamps AC. Polymerase chain reaction (PCR): the technique and its applications. Austin: RG Landes; 1993. 11. Ley TJ, Ding L, Walter MJ, McLellan MD, Lamprecht T, Larson DE, et al. DNMT3A mutations in acute myeloid leukemia. New Engl J Med 2010; 363 (25): 2424-2433. 12. Tatton-Brown K, Seal S, Ruark E, Harmer J, Ramsay E, del Vecchio Duarte S, et al. Mutations in the DNA methyltransferase gene DNMT3A cause an overgrowth syndrome with intellectual disability. Nat Genet 2014; 46 (4): 385-388. 13. Tzelepi V, Logotheti S, Efstathiou E, Troncoso P, Aparicio A, Sakellakis M, et al. Epigenetics and prostate cancer: defining the timing of DNA methyltransferase deregulation during prostate cancer progression. Pathology 2020; 52 (2): 218-227. 14. Abedi M, Rahgozar S, Moafi A, Ghaedi K, Moshtaghian SJ, Entezar-e-Ghaem MS, et al. Evaluation of the expression profile of MDR1 gene and assessment of its prognostic value in childhood ALL. Sci J Iran Blood Transfus Organ 2014; 10 (4). [Farsi] 15. Ahmadi J, Kaviani S, Atashi A. Evaluation of MALAT1 gene expression in AML and ALL cell lines. Koomesh 2015; 17 (1). [Farsi] 16. Gudas LJ. Retinoids induce stem cell differentiation via epigenetic changes. Semin Cell Dev Biol 2013; 24 (10-12): 701-705. 17. Tanaka Y, Kato M, Hasegawa D, Urayama KY, Nakadate H, Kondoh K, et al. Susceptibility to 6-MP toxicity conferred by a NUDT15 variant in Japanese children with acute lymphoblastic leukaemia. Brit J Haematol 2015; 171 (1): 109-115. 18. Yang JJ, Landier W, Yang W, Liu C, Hageman L, Cheng C, et al. Inherited NUDT15 variant is a genetic determinant of mercaptopurine intolerance in children with acute lymphoblastic leukemia. J Clin Oncol 2015; 33 (11): 1235-1242. 19. Brunetti L, Gundry MC, Goodell MA. DNMT3A in leukemia. Cold Spring Harb Perspect Med 2017; 7: a030320. 20. Ribeiro RS, Machado-Neto JA, Campos PDM, Eide CA, Savage SL, Lorand-Metze I, et al. DNMT3A is highly expressed in bone marrow cells from acute myeloid leukemia patients. Blood 2017; 130: 3969. 21. Gaidzik VI, Weber D, Paschka P, Kaumanns A, Krieger S, Corbacioglu A, et al. DNMT3A mutant transcript levels persist in remission and do not predict outcome in patients with acute myeloid leukemia. Leukemia 2018; 32 (1): 30-37. 22. Rostamian T, Pourrajab F, Hekmatimoghaddam S. The effect of 6-thioguanine on proliferation, viability and expression of the genes DNMT 3A, DNMT 3B and HDAC3 in lymphoid cancer cell line Nalm6. Iran J Pediatr Hematol Oncol 2019; 10 (1): 28-37. 23. Dexheimer GM, Alves J, Reckziegel L, Lazzaretti G, Abujamra AL. DNA methylation events as markers for diagnosis and management of acute myeloid leukemia and myelodysplastic syndrome. Dis Markers 2017; ID 5472893: 1-14. 24. Shaknovich R, Cerchietti L, Tsikitas L, Kormaksson M, De S, Figueroa ME, et al. DNA methyltransferase 1 and DNA methylation patterning contribute to germinal center B-cell differentiation. Blood 2011; 118(13): 3559-3569.