As early as possible! Chronic pancreatitis is a toxic environment for the Islets of Langerhans. Patients will become diabetic over time (diabetes 3c: 50% at 10 years and 80% at 20 years) and this natural history is not altered by traditional resection or drainage approaches (Whipple, Puestow, etc.). More advanced disease is associated with greater risk of diabetes, with pancreatic calcifications and exocrine insufficiency as independent risk factors. Dr. Hughes has largely abandoned these traditional approaches for total pancreatectomy with islet auto transplantation (TP-IAT). The earlier we perform TP-IAT, the more pain-free life-years the patient has, the more islets we get and the more likely the patient is not diabetic long term.