Twenty one evaluable patients with advanced colorectal carcinoma were treated with continuous infusion of spirogermanium at a median daily dose of 150 mg/m2 (range 120-210) for five consecutive days every 14 days. Treatments were accomplished by using outpatient infusion devices. Fifteen patients had not received any prior radiation therapy, immunotherapy, or chemotherapy. Nineteen patients were previously untreated with chemotherapy. Five patients had received prior immunotherapy with copovithane and only two patients had received radiation therapy prior to spirogermanium therapy. None of the patients achieved a complete or partial remission. Minor tumor regressions were observed in two patients, both were less than 12 weeks in duration. The major toxicities included nausea and vomiting and neurologic side effects; however, the toxicity was completely reversible. Spirogermanium is not effective in the treatment of patients with advanced colorectal carcinoma.