The Development of a Metabolomic Test to Diagnose and Quantify Pancreatic Exocrine Insufficiency (The DETECTION Study)

Inclusion Criteria: (for main pancreatic cancer cohort) * PDAC * PEI (as defined by breath test) * Tolerating oral diet Inclusion Criteria: (for CF cohort) * CF * PEI (as defined by breath test) * Tolerating oral diet Inclusion Criteria: (for CP cohort) * CP * PEI (as defined by breath test) * Tolerating oral diet Exclusion Criteria (all arms): * No other GI conditions * For each arm no evidence of the other arm conditions * For health controls, no history of CP, CF or pancreatic cancer * No GI surgery (except pancreatic resection in the pancreatic cancer cohort) * Unable to consent * Unable to travel to UHB for testing * Prognosis \< 2months * Performance status 2+