6. Subjects may have been previously treated with adjuvant radiation therapy and 5-fluorouracil or Gemzar as a radiosensitizer in the adjuvant setting if they currently have evidence of progression. Following completion of XRT, no further adjuvant chemotherapy with either Gemzar or 5-FU is permitted. No prior Gemzar® for metastatic disease or for primary treatment of locally advanced disease is allowed. Gemzar® used solely as a radiation sensitizer in the adjuvant setting is permitted.