[Thrombotic thrombocytopenic purpura].

In this article, I mainly review the molecular targeted therapy for thrombotic thrombocytopenic purpura (TTP). TTP is one of thrombotic microangiopathies (TMA), which demonstrate hemolytic anemia with red blood cell destruction and thrombocytopenia. Another TTP, hemolytic uremic anemia (HUS) reveals bloody stood and acute kidney failure. As it is difficult to correctly diagnose TTP based on clinical symptoms alone, a confirmation of whether ADAMTS13 activity is lower than 10% is required. In the past few years, TTP was designated as an intractable disease by law, and the clinical application of ADAMTS13 test and rituximab became labeled in Japan. Currently, we are expecting that recombinant ADAMTS13 and caplacizumab for immune TTP will be applied.