FILE – In this April 28, 2015 file photo, a patient has her blood drawn for a liquid biopsy at a hospital in Philadelphia. According to results released on Tuesday, April 28, 2020, for the first time, a blood test has been shown to help detect many types of cancer in a study of thousands of women with no symptoms of the disease. The test is still experimental and even its fans say it needs to be improved. (AP Photo/Jacqueline Larma)

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