A 34-year-old woman presents with three days of gingival bleeding, epistaxis, and menorrhagia. Examination reveals petechiae and oral blood blisters. CBC shows WBC 3.2 with 82% atypical promyelocytes, hemoglobin 7.6 g/dL, and platelets 18,000/μL. Coagulation studies demonstrate PT 22 seconds, aPTT 48 seconds, fibrinogen 90 mg/dL, and D-dimer 18,000 ng/mL. Peripheral smear shows hypergranular promyelocytes with Auer rods bundled into faggot cells. Cytogenetic analysis reveals the chromosomal abnormality marked **C** in the diagram. Which of the following is the most appropriate IMMEDIATE management for this patient?
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