نبذة مختصرة : Summary Immune thrombocytopenic purpura (ITP) is an autoimmune thrombocytopenia with shortened platelet survival and relative bone marrow failure. The pathogenesis involves antibody production, cytokine release, T cell impairment, complement activation and clearance of platelets. We measured plasma levels of C3, C4, C1q and sC5b-9 in 80 ITP patients in acute phase, 50 ITP patients in complete (CR) or partial (PR) remission and 50 age- and sex-matched healthy volunteers. Statistical analyses showed that acute ITP patients had higher plasma levels of sC5b-9 and C1q than CR or PR patients (median = sC5b-9: 200 versus 98 mg/dl, P-value
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