Antigen 19-9 is a marker for which type of cancer?

Antigen 19-9 is a marker for which type of cancer?

• A. Stomach cancer
• B. Pancreatic cancer
• C. Prostate cancer
• D. Ovarian cancer

Answer: (B)

Antigen 19-9, also known as CA 19-9, is predominantly recognized as a tumor marker for pancreatic cancer. Elevated levels of this antigen are commonly associated with malignant conditions of the pancreas. While CA 19-9 can also be seen in other gastrointestinal cancers, including bile duct and stomach cancers, it is most notably elevated in pancreatic cancer, making it a valuable tool for monitoring disease progression or response to therapy in patients with this type of cancer.

The specificity of CA 19-9 for pancreatic cancer is a crucial aspect of its use in clinical practice. Although some other conditions, including benign diseases of the liver and biliary tract, can lead to increased levels of CA 19-9, its role as a primary marker in the context of pancreatic malignancies makes it highly relevant for both diagnosis and management of this specific cancer type.