A Study of Avatrombopag in Adults With Aplastic Anemia Who Did Not Respond to, Cannot Receive, or Had Return of Disease After Standard Treatment

This research study is testing a medicine called avatrombopag in adults with aplastic anemia, a rare condition where the bone marrow does not produce enough blood cells. The study will include about 26 participants from Japan, South Korea, and Taiwan whose disease has not responded to standard treatment, who cannot receive standard treatment, or whose disease has returned after previous treatment. The goal is to learn how well avatrombopag works and how safe it is for these patients.