Subjects with arterial thrombotic events in the prior 12 months (axitinib has never been studied in this population) Subjects who have had venous thrombotic events in the prior 6 months (axitinib has never been studied in this population) Prior treatment with axitinib Inlyta® (axitinib) and/or, Prior therapy with bosutinib or axitinib Patients with a history of hypersensitivity to bosutinib or axitinib Known hypersensitivity to any component of axitinib or prior use of axitinib Prior therapy with axitinib Clinically significant organ/system disease unrelated to RCC that in the judgment of the investigator should preclude treatment with dalantercept or axitinib. Any prior treatment with axitinib. A morbidity (per the prescribing information) that would require starting a patient at a reduced dose of axitinib. Patients who were assigned to an axitinib containing treatment arm in a previous clinical trial Patients who were receiving axitinib tablets at the time their previous trial ended Parts A and B only: Has received a prior course of axitinib.