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Blood, 15 June 2004, Vol. 103, No. 12, pp. 4562-4564. Prepublished online as a Blood First Edition Paper on February 19, 2004; DOI 10.1182/blood-2003-09-3352.
HEMOSTASIS, THROMBOSIS, AND VASCULAR BIOLOGY Platelet-associated autoantibodies as detected by a solid-phase modified antigen capture ELISA test (MACE) are a useful prognostic factor in idiopathic thrombocytopenic purpuraFrom the Department of Medical and Surgical Sciences, University of Padua Medical School, Padova, Italy.
There were 50 consecutive idiopathic thrombocytopenic purpura (ITP) adult patients (platelet count < 100 x 109/L) grouped according to positivity or negativity of a solid-phase modified antigen capture enzyme-linked immunosorbent assay (ELISA) test (MACE) against glycoprotein IIb/IIIa (GPIIb/IIIa), Ib/IX, and IIa/IIIa. Observation started on the day of MACE assay and lasted at least 6 months. Clinical worsening was defined as the need for starting or modifying therapy because of thrombocytopenia lower than 20 x 109/L or patient admission due to bleeding symptoms. MACE-positive patients had a higher probability of clinical worsening than MACE-negatives (P < .004). The proportion of patients worsening was 18 (72%) of 25 among MACE-positives and 8 (32%) of 25 among MACE-negatives. The median time to clinical worsening was 2.1 months for MACE-positive patients and 27.7 months for MACE-negatives. The assay of specific platelet autoantibodies may be a useful prognostic tool for the clinical course of ITP. (Blood. 2004;103:4562-4564)
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