Clinically significant gastrointestinal bleeding within 6 months prior to the first dose of ALRN-6924 Ongoing, clinically significant bleeding (CTCAE grade 3 or 4) Known or suspected clinically significant active bleeding. History of clinically significant bleeding or known platelet or coagulation disorder Patients with history of clinically significant bleeding disorder Patients with clinically significant unexplained bleeding within 28 days prior to entering the study History or evidence of bleeding disorder or active clinically significant bleeding requiring medical intervention. History of clinically significant bleeding No clinically significant gastrointestinal bleeding within 24 weeks before the first dose of study treatment Any sign of clinically significant bleeding Bleeding diathesis including clinically significant platelet disorders or active hemoptysis (defined as bright red blood of ? 1/2 teaspoon [2.5 mL] in any 24 hour period) within 6 months prior to study day 1. For clinically significant epistaxis within 4 weeks prior to study day 1, no risk of further bleeding must be clearly documented. Clinically significant gastrointestinal bleeding within 6 months prior to the first dose of ALRN-6924 History of active clinically significant bleeding Clinically significant bleeding within 14 days of Cycle 1 Day 1 (Treatment Groups B and C only). Clinically significant bleeding within 28 days of Cycle 1 Day 1 Patients with clinically significant unexplained bleeding within 28 days prior to entering the study PART B: History of clinically significant bleeding disorder History of clinically significant bleeding episodes Documented or known clinically significant bleeding disorder. History of clinically significant bleeding within 6 months of enrollment/randomization Patients must not have a known coagulopathy that increases risk of bleeding or a history of clinically significant hemorrhages in the past Patients with clinically significant unexplained bleeding within 28 days prior to entering the study Patients with clinically significant unexplained bleeding within 28 days prior to entering the study Any sign of clinically significant bleeding Clinically significant bleeding within 30 days before enrollment Clinically significant bleeding within 28 days of study Day 1 Clinically significant gastrointestinal bleeding occurring <= 4 weeks prior to randomization Have active, acute, or chronic clinically significant infections or bleeding. History of clinically significant bleeding within 6 months of enrollment/randomization Patients with clinically significant unexplained bleeding within 28 days prior to entering the study Patient has acute bleeding that is clinically significant within 24 hours before the start of study treatment.