What tumor marker can indicate liver and gallbladder disease, among others?

CA 19-9 is a tumor marker that is commonly associated with pancreatic cancer, but it is also relevant in the context of liver and gallbladder diseases. Elevated levels of CA 19-9 can indicate the presence of malignancies in these organs, as well as other conditions such as cholestasis or biliary obstruction.

This marker is specifically glycoprotein produced by certain epithelial cells and is used to help monitor treatment response and disease progression in patients with pancreatic and biliary tumors. Its clinical significance in liver and gallbladder diseases underscores its utility as a biomarker in the diagnostic process, giving healthcare providers valuable information to guide patient management.

In contrast, CA-125 is primarily associated with ovarian cancer, PSA is used mainly for prostate cancer, and S-100 is of interest in melanoma and certain neurodegenerative conditions. These tumor markers do not specifically indicate liver or gallbladder issues, which is why they are not the correct choice for this question.