Aminothiadiazole (NSC #4728) in patients with advanced colon cancer. A phase II study of the Eastern Cooperative Oncology Group.

The Eastern Cooperative Oncology Group (ECOG) studied 29 patients with advanced measurable colon cancer who were treated with Aminothiadiazole (NSC #4728) 125 mg/m2 intravenously. Allopurinol 300 mg daily was taken by all patients during treatment. Three patients (12%) demonstrated partial responses on this regimen. Hematologic toxicity did not occur. Gastrointestinal toxicity was severe in 16% of patients and consisted primarily of vomiting and diarrhea. No life-threatening toxicity was encountered. A lack of appreciable toxicity together with the few responses seen suggest that further studies at higher dose may be indicated.