Islet transplantation is a relatively new procedure used in people with difficult to control Type 1 diabetes. Insulin producing cells (islets) are isolated from a pancreas of a deceased organ donor. After the cells are carefully prepared, the islets are transplanted into patient's body. These transplanted islets may produce insulin for the patient. Patient may be able to reduce or eliminate the need for insulin injections for an unknown period of time. Patients who receive an islet transplant may need to stay on powerful immunosuppressive drugs for as long as the islets remain alive and working. These drugs help to prevent the immune system from attacking the transplanted islets.