IGF1 and autoimmune pancreatitis: When analysed for serum proteins, it was found that insulin-like growth factor I (IGF-1) and transerythrin (=prealbumin) were lower in chronic AIP patients (n = 14) who had more than one attack in less than four years than in patients (n = 12) who presented with a single acute attack and remained asymptomatic thereafter [52].