What about neuroendocrine (islet cell tumors)?

Interesting tumor. Overally, neuroendocrine tumors are often capable of over-producing hormones that your body naturally makes. Islet cells are cells that are naturally present in the pancreas and produce a number of hormones, most notably insulin. Insulin helps you break down and digest sugars. Patients with an islet cell tumor can produce too much Insulin resulting in weight & gain and low blood sugars.