- Prior chemotherapy, major surgery, or irradiation must have been completed at least 3 weeks prior to starting treatment with study drug, with the exception of mitomycin-C or nitrosoureas, which should be completed at least 6 weeks prior. Additionally, patients must have recovered to ≤ Grade 1 toxicities incurred as a result of the previous therapy, with the exception of nail dystrophy, alopecia, or local radiation therapy induced adverse events (e.g., impotence or incontinence). A patient who has received radiation to < 5% of their total bone marrow volume and who has had 2 weeks of rest may be considered for study entry after discussion with the Sponsor