A 52-year-old female was diagnosed with CML in April 2001….Missense mutation in PRDM1 was identified….Because of her obvious decrease of platelets, she started treatment with thalidomide (200 mg/day) and prednisone (50 mg/day), and at the same time imatinib treatment was continued....Three months later, bone marrow aspirate showed disappearance of plasma cells....