[Clinical phase II study of 5'-DFUR for cancer of the digestive organs by a cooperative study group].

Phase II study of a new 5-fluorouracil derivative, 5'-deoxy-5-fluorouridine (5'-DFUR), was performed with oral administration. Forty-nine patients with advanced cancer of the digestive organs, lung and breast were entered, and 8 institutions in Hokkaido were involved. 5'-DFUR was administered three or four times a day at a daily dosage of 600 to 1200 mg. Partial response was observed in three gastric cancer cases and two breast cancer cases out of 39 evaluable cases, and minor response was observed in one colorectal cancer case. Overall response rate was 12.8%, 15.8% in gastric cancer and 66.7% in breast cancer. Side effects were observed in 15 cases out of 45 (33.3%), which mainly consisted of gastro-intestinal disturbances such as diarrhea.