Avatrombopag vs. Placebo for CIT in GI Malignancies

This is a randomized, double-blinded, placebo-controlled, multicenter phase 2 clinical trial evaluating Avatrombopag versus placebo for Chemotherapy-Induced Thrombocytopenia (CIT) in patients with gastrointestinal (GI) malignancies. Avatrombopag may increase or stimulate megakaryocytes, which aid in producing blood platelets, resulting in an increased production of platelets. * Participants will be "randomized" into one of the study groups: Group A: Avatrombopag or Group B: Matching placebo. Randomization means that a participant is put into a group by chance. * All patients who complete the study (whether they received avatrombopag or placebo) have the opportunity to receive avatrombopag to treat CIT through a special free drug program available only to the participants of this study. The U.S. Food and Drug Administration (FDA) has not approved avatrombopag for CIT, but it has been approved for other uses. Study procedures include screening for eligibility, treatment visits, and blood tests. Participants will receive the study treatment or placebo for up to seven weeks and will be followed for up to 42 days after the last dose. It is expected that about 60 people will take part in this research study. Swedish Orphan Biovitrum (Sobi), biopharmaceutical company, is supporting this research study by providing the study drugs and funding.