Patients for who are unable to tolerate oral Xeloda because of the size of the tablets or difficulties with their upper gastroiontestinal tract or for whom Xeloda cannot be obtained, the intravenous equivalent of 5-Fluorouracil (5-FU) will be administered as a continuous intravenous infusion. Patients who started out on Xeloda and during the treatment experience difficulties in continuing taking Xeloda maybe switched to a biological equivalent dose of 5-FU during the treatment. The 5-FU dose range administered in lieu of Xeloda will be administered and adjustments will be made in 50 mg/m2/day steps as previously pubished by Lokich et al.