Then, we analyzed if DNMT1, 3A, 3B1, and DNMT3B3, 3B4, 3B5, 3B6, 3B7, and 3B3Δ5 isoforms’ expression was associated with the stage of disease and tumor grade in serous ovarian carcinoma (SOC). The gene discussed is DNMT1; the disease is ovarian serous carcinoma.