- Subject has received chemotherapy or a TKI ≤ 7 days, investigational agent ≤ 14 days, or radiotherapy ≤ 28 days prior to the start of study drug or has not recovered from the acute toxicities associated with any prior treatments including approved therapies, investigational agents, and prior stem cell or bone marrow transplant. The following exceptions apply: i) Hydroxyurea is permitted at any time prior to study enrollment; ii) Glucocorticoids (natural or synthetic) are allowed up to 48 hours prior to the start of the study drug (with the exception of steroids for pre-medication and topical/nasal steroid use which are allowed at any time)