Multiple Endocrine Neoplasia Type 1 (MEN1): Loss of One MEN1 Allele in Tumors and Monohormonal Endocrine Cell Clusters But Not in Islet Hyperplasia of the Pancreas

Abstract

The frequent presence of single nonneoplastic insulin cells in microadenomas and the occurrence of microadenomas in islets suggest an islet origin of microadenomas. Islet hyperplasia does not seem to be an obligatory stage in pancreatic MEN1-associated tumor development.