Safety, Efficacy, PD of FE203799 in Short Bowel Syndrome on Parenteral Support

Part A:once weekly dosing for 4 weeks in patients with short bowel syndrome who require total parenteral nutrition; patients will complete period 1 and after a 6-10 week wash-out, they will enter period 2 (active treatment and placebo); Part B: treatment period 3, is an open label extension to part A and starts after a washout of 6-10 weeks after the last dose in treatment period 2. patients are dosed once weekly for 4 weeks.