Gemcitabine is given by vein over 30 minutes on days 1 & 8 of each 21-day cycle. LY231514 is also given by vein over 10 minutes on day 8, following the Gemcitabine injection. Vitamin supplementation with oral folic acid and injectable B12 is initiated 7-10 days prior to the first dose of LY231514, and continuing throughout the patient's participation. Vitamin B12 is administered approximately every 9 weeks after the first injection. Appropriate antiemetic medication should be given to all patients. Dexamethasone 4mg PO twice daily is given for 3 days per cycle, beginning 1 day prior to LY231514 dosing. This is given to prevent or lessen the possibility of a rash.