Using blood, saliva, urine to detect cancer: Scientists’ ‘holy grail’
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Testing for cancer in blood, urine or even saliva: That approach has been called the “holy grail” for diagnosing the second leading cause of death in the world, and it has been fueling an area of research that continues to raise eyebrows and questions.
https://www.cnn.com/2019/04/03/health/cancer-test-liquid-biopsy-explainer/index.html