Researchers at the University of Pennsylvania School of Medicine have found that the acute loss of a protein called menin can cause the proliferation of pancreatic islet cells, which secrete insulin to regulate blood sugar. The menin gene (Men1) mutation in humans causes an inherited disease called Multiple Endocrine Neoplasia type 1 (MEN1). Not only could this discovery inform basic cancer biology, it also has implications for treating Type 1 diabetes. The researchers report their findings in the latest issue of Cancer Research.