CA 19-9 is associated with which conditions?

CA 19-9 is associated with which conditions?

• A. Colorectal cancers and malignant lesions
• B. Ovarian cancer
• C. Hepatocellular carcinoma
• D. Prostate cancer

Answer: (A)

CA 19-9 is a tumor marker (a carbohydrate antigen) that rises with several GI malignancies. It is most commonly associated with pancreatic and biliary tract cancers, but it can also be elevated in colorectal cancers, especially with advanced disease. This makes colorectal cancers and malignant lesions the best match among the options, since the other choices are linked to different markers (ovarian cancer with CA-125, prostate cancer with PSA, hepatocellular carcinoma often with AFP). Remember that CA 19-9 can also be elevated in benign biliary conditions, so it’s not used alone for diagnosis but as part of monitoring disease burden and treatment response.

CA 19-9 is a tumor marker (a carbohydrate antigen) that rises with several GI malignancies. It is most commonly associated with pancreatic and biliary tract cancers, but it can also be elevated in colorectal cancers, especially with advanced disease. This makes colorectal cancers and malignant lesions the best match among the options, since the other choices are linked to different markers (ovarian cancer with CA-125, prostate cancer with PSA, hepatocellular carcinoma often with AFP). Remember that CA 19-9 can also be elevated in benign biliary conditions, so it’s not used alone for diagnosis but as part of monitoring disease burden and treatment response.