Glucocorticoid Therapy Ameliorated Hypoglycemia in Insulin-like Growth Factor-II-producing Solitary Fibrous Tumor

A 54-year-old man with a past history of multi-operation for solitary fibrous tumor was hospitalized for hypoglycemia. Computed tomography demonstrated multiple tumors in the liver but not in the pancreas. His serum insulin-like growth factor (IGF)-II level was normal, but immunoblot analysis and immunohistochemistry revealed a high molecular weight form of IGF-II in the serum and tumor. Surgical resection was impossible, because of tumor dissemination. Hypoglycemia was repeated despite infusion of glucose and glucagon. Glucocorticoid dramatically and continuously abolished hypoglycemia. In cases of inoperable IGF-II-producing tumor, glucocorticoid therapy may be promising for hypoglycemia.