II. Pathophysiology
- Cancer Antigen 19-9 is expressed in pancreatic disease and hepatobiliary disease
III. Indications
- Pancreatic ductal adenocarcinoma
- Confirms diagnosis
- Predicts prognosis as well as recurrence risk
- Not indicated for screening in asymptomatic patients
- No tumor specific (see efficacy below)
IV. Causes: Increased CA 19-9
- Pancreatic Ductal Adenocarcinoma
- Chronic Pancreatitis
- Chronic inflammatory states
V. Efficacy: Pancreatic Ductal Adenocarcinoma
- Test Sensitivity: 50-75%
- Test Specificity: 80-85%