Heretofore morbidity and risk of death in Zollinger-Ellison syndrome were caused by severe ulcer disease. The advent of specific drugs to cure ulcer disease now extends life until metastases from the non-beta-islet cell tumor cause death. The present study proposes to continue to test the effect of combined chemotherapy with streptozotocin, 5-fluorouracil and doxorubicin in biopsy-proven cases of metastatic non-beta-islet cell tumor in patients with Zollinger-Ellison syndrome. We published our initial experience with this protocol in 1988. An objective response was observed in 40% of patients.