What type of cancer is associated with the tumor marker CA-125?

CA-125 is a tumor marker that is primarily associated with ovarian cancer. This glycoprotein is often elevated in the blood of patients with this type of cancer, and it is utilized in clinical practice for several purposes, including diagnosis, monitoring treatment response, and detecting recurrence of ovarian cancer.

In the context of ovarian cancer, measuring CA-125 levels can aid in assessing the disease's progression or regression during treatment. Although CA-125 can also be elevated in other conditions, including benign diseases and different cancers, its most significant association remains with ovarian malignancies. This specificity makes CA-125 a valuable tool in the oncologic assessment of suspected or known ovarian cancer patients.

While other types of cancer do have their own specific markers, the elevated levels of CA-125 are most clinically relevant to ovarian cancer, thereby reinforcing the accuracy of identifying it as the correct answer in this context.