Computed Tomography in Diagnosing Patients With Pancreatic or Hepatobiliary Cancer

Participants to receive 2 CT scans. One scan performed before the start of chemotherapy, and the other at first restaging visit with oncologist.

Participant to complete the MD Anderson Symptom Inventory for Gastrointestinal cancer (MDASI-GI) questionnaire at baseline visit, and follow up visit. Questionnaires should take about 10 minutes to complete.