- More than 2 previous chemotherapy regimens are not allowed. The patients should have recovered from any toxic effect and at least 2 weeks should have elapsed from last dose before their entry (14 days for vinorelbine and other vinca alkaloids or gemcitabine). Patients who in the investigator's opinion are fully recovered from surgery for at least 4 weeks may also be considered for the study. Patients should have recovered from any severe toxicity (CTC > 1) caused by any previous therapy.