A 38-year-old female patient presents to the outpatient department with a 2-month history of abdominal distension in the left upper quadrant, poor appetite, weight loss, fatigue, and night sweats. Physical examination reveals a mild anemic appearance, mild sternal tenderness, and splenomegaly (5 cm below the costal margin). Laboratory tests show a white blood cell (WBC) count of 250×10<sup>9</sup>/L with numerous myelocytes and metamyelocytes on differential. Bone marrow examination confirms chronic myeloid leukemia (CML). What is the most appropriate treatment for this confirmed CML case?