What Are Tumor Marker Tests for Cancer? 8 Things You Need …
https://www.cancer.net/blog/2019-09/what-are-tumor-marker-tests-cancer-8-things-you-need-know
WebSep 17, 2019 · 1. What are tumor markers? Tumor markers are substances found in higher-than-normal levels in the blood, urine, or tissues of some people with cancer. These substances, which are also called biomarkers, can be made by the tumor. They can also be made by healthy cells in response to the tumor.
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