- Patient must have received no prior therapy for the treatment of metastatic disease. Prior treatment with 5-fluorouracil (5-FU) or gemcitabine administered as a radiation sensitizer during and up to 4 weeks after radiation therapy is allowed. If a patient received gemcitabine in the adjuvant setting, tumor recurrence must have occurred at least 6 months after completing the last dose of gemcitabine.