Allogeneic Transplantation
The main purpose of this study is to look at the effect (efficacy) and safety of efgartigimod IV in participants with primary immune thrombocytopenia (ITP).
Essential thrombocythemia who have an inadequate response to or are intolerant of hydroxyurea
Eligibility: Ages ≥ 18; Recent unfractionated heparin or low-molecular-weight heparin exposure