What is "ca19-9"

n. (initialism of carbohydrate antigen 19-9 English), a tumor marker for colon and pancreatic cancer also found in non-malignant conditions.

CA 19-9 (carbohydrate antigen 19-9, also called cancer antigen 19-9 or sialylated Lewis (a) antigen) is a tumor marker that is used primarily in the management of pancreatic cancer. CA 19-9 is an antigen defined by monoclonal antibody binding to CA 19-9, the tumor surface marker Sialyl-Lewis A.