Avatrombopag for Thrombocytopenia in People With Cancer

This study will test whether avatrombopag is an effective treatment for thrombocytopenia in people who have both cancer and a liver disease (such as cirrhosis, cholangitis, or hepatitis). Researchers will look at whether giving participants avatrombopag for 3 weeks can raise their platelet levels enough for them to begin chemotherapy. The study will also test whether avatrombopag can continue to be effective against thrombocytopenia while participants are on chemotherapy for 12 weeks or longer. In addition, researchers will determine how safe the study drug is in participants.