- Prior chemotherapy, radiation therapy, or surgery for the primary tumor within 28 days of dosing and/or has not recovered from prior therapy toxicities - with the exception of non-experimental chronic hormone therapy for currently progressive metastatic prostate cancer. However, local radiation to a site of symptomatic disease will be acceptable if it has been completed at least 14 days prior to study drug initiation and subjects have recovered from all treatment-related side effects.