The Relationship Between Triceps Skinfold and Overall Survival of Pancreas, Bile Duct, Gallbladder Cancer

This study is looking at whether a simple body measurement called the triceps skinfold (a pinch test to measure fat thickness at the back of the upper arm) can predict how long patients with cancers of the pancreas, bile duct, or gallbladder will survive, as a way of quickly assessing nutritional status and its effect on outcomes. **You may be eligible if...** - You have been newly diagnosed with pancreatic cancer, bile duct cancer, or gallbladder cancer - You are undergoing some form of treatment (surgery, chemotherapy, or palliative care) - You are 18 years or older **You may NOT be eligible if...** - You have another active cancer - You have a bowel or digestive condition that affects how your body absorbs nutrients - You have a psychiatric disorder such as an eating disorder (bulimia or anorexia) Talk to your doctor to see if this trial is right for you.