- Participants must have histologically confirmed solid tumor malignancy that is metastatic or unresectable and for which standard curative or palliative measures do not exist or are no longer effective; participants with uncontrolled Kaposi sarcoma are permitted (KS must be increasing despite HAART and HIV suppression for greater than or equal to 2 months, or stable KS despite HAART for greater than or equal to 3 months)