4. Patients that have had any treatment specific for tumor control within 3 weeks of study drug treatment or: a. within 2 weeks if cytotoxic agents were given weekly b. within 6 weeks for nitrosoureas or mitomycin C c. within 4 half-lives for targeted agents with half lives and pharmacodynamic effects lasting less than 5 days (that includes, but is not limited to, erlotinib, sorafenib, sunitinib, bortezomib, and other similar agents) d. failed to recover from toxic effects of any therapy prior to study entry