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CA 19-9 is a protein produced by cancer cells that can indicate the presence and progression of certain malignant or benign health conditions. A CA 19-9 test is used to help detect and diagnose pancreatic ductal adenocarcinoma (PDAC), a highly aggressive cancer that accounts for more than 80 percent of pancreatic cancer cases. The test also evaluates CA 19-9 levels in other cancers of the stomach, bile duct and colon. domino 99 apk slot