A 38-year-old woman presents with progressive fatigue, petechiae, and recurrent infections for 3 months. Complete blood count shows hemoglobin 7.2 g/dL, WBC 2100/μL, and platelets 45,000/μL. Bone marrow examination reveals hypocellular marrow with no fibrosis or dysplasia. What is the most common cause of pancytopenia in this clinical scenario?

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