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Benign and malignant gastrinoma.

The advent of the histamine H2-receptor antagonists and the renewed interest in curative surgery in patients with gastrinoma have made the differentiation between benign and malignant tumors of critical importance. An analysis of 65 patients with gastrinoma followed for an average of 93 months revealed two distinct clinical groups: those with and those without hepatic tumors at initial examination or operation. Among the 14 patients with hepatic tumors, 12 had multiple liver metastases from pancreatic or duodenal primary tumors, and 2 had primary hepatic gastrinomas. Ten of the 14 patients (71 percent) died from tumor progression, and the total tumor-related mortality for this group was 79 percent. In contrast, only 1 of 15 patients (7 percent) with tumor in the lymph nodes died from a tumor-related cause (recurrent ulcer hemorrhage), and none died from tumor progression. Only a single patient with lymph node metastases at initial exploration went on to the development of liver metastases, which was found incidentally at autopsy 313 months later. Among 23 patients with either primary tumors only or no tumors found at laparotomy, there was only one tumor-related death and no deaths from tumor spread. Life-table analysis demonstrated a significantly decreased length of survival for patients with liver tumor compared with those without liver involvement. Multiple endocrine adenopathy syndrome was not a significant factor in survival. Serum gastrin levels were likewise nondiscriminatory. Six of 52 patients (12 percent), including three with tumor in the lymph nodes, were apparently cured by excision of all gastrinoma recognized at laparotomy. The cure rate was 23 percent for patients without multiple endocrine adenopathy syndrome or liver metastases. Hepatic metastases is a definitive marker for clinically malignant disease and portends a poor prognosis. Patients with gastrinoma confined to the lymph nodes uncommonly follow a malignant clinical course. Such patients have at least a 20 percent probability of surgical cure if they do not have multiple endocrine adenopathy syndrome.

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