Pancreatic and biliary tract cancer are ones of the leading causes of cancer-related deaths. During the course of illness, these patients often experience marked physical suffering, psychological distress and frequent unplanned resource-demanding hospitalized care. Patients with pancreatic and lung cancer have highest rates of unplanned hospitalizations. Investigator initiated prospective Study of Supportive Application with Integrated Patient-Reported Outcomes in Patients with Advanced Pancreatic or Biliary Tract Cancer (BetterEveryDay) is to be initiated based on the great need for optimizing treatment care, reducing hospitalizations and improving outcomes.