4. Any treatment specific for tumor control within 3 weeks of study drugs; or within 2 weeks if cytotoxic agents were given weekly (within 6 weeks for nitrosoureas or mitomycin C), or within 4 half-lives for target agents with half lives and pharmacodynamic effects lasting less than 5 days (that include but are not limited to erlotinib, sorafenib, sunitinib, bortezomib, and other similar agents); or failure to recover from the toxic effect of any therapy prior to study entry.