Which tumor marker is commonly associated with lung cancer?

The tumor marker commonly associated with lung cancer is CEA, or carcinoembryonic antigen. CEA is a glycoprotein involved in cell adhesion and is typically present at low levels in healthy adults. It tends to be elevated in various malignancies, particularly in non-small cell lung cancer, and can be used to monitor the disease as well as response to treatment. Elevated levels of CEA in patients with lung cancer can provide insights into the progression of the disease and potential treatment outcomes.

In contrast, CA 19-9 is primarily used as a marker for pancreatic cancer and sometimes for colorectal cancer, while AFP (alpha-fetoprotein) is associated with liver cancer and germ cell tumors. PSA (prostate-specific antigen) is specific to prostate cancer. Therefore, although elevated markers can occur in different malignancies, CEA’s strongest association is with lung cancer, making it the most relevant choice in this context.