Oliver A. J, Gómez-Millán J, Medina A. J, Cabeza L, Perazzoli G, Jimenez-Luna C, Doello K, Ortiz R. O6-methylguanine-DNA Methyltransferase Promoter Methylation in Patients with Rectal Adenocarcinoma After Chemoradiotherapy Treatment: Clinical Implications. Balkan Med J 2019;36:283-286