8. Prior anticancer therapy, radiotherapy, hormonal, and immunotherapy are allowed. Patients must have recovered from toxicity of prior therapy (ie, toxicity has resolved to Grade 1, or to pre-treatment baseline, or is deemed irreversible). At least 4 weeks must have elapsed since the last systemic therapy (6 weeks for nitrosoureas, mitomycin-C, and liposomal doxorubicin), immunotherapy, or radiotherapy and the beginning of study drug administration. For participants with GIST on approved tyrosine kinase inhibitors (TKI), at least 2 weeks must have elapsed since the last dose of TKI.