- Tumor markers are substances that can be found in abnormal amounts in the blood, urine, or tissues of some patients with cancer.
- Different tumor markers are found in different types of cancer.
- Tumor markers may be used to help diagnose cancer, predict a patient’s response to particular therapies, check a patient’s response to treatment, or determine if cancer has returned.
- In general, tumor markers cannot be used alone to diagnose cancer; they must be combined with other tests.
- Researchers continue to study tumor markers and to develop more accurate methods to detect, diagnose, and monitor cancer.
Source: National Cancer Institute