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The Conversation 2026-11-09
New blood test claims to detect over 50 cancers early, but lacks evidence for reducing mortality risk. The Galleri blood test, developed by the biotech company GRAIL, claims to detect over 50 types of cancer before symptoms arise. However, clinical trial data reveals that it struggles with early-stage cancer detection and has not demonstrated an ability to reduce the risk of dying from cancer. Despite its potential, experts, including a physician involved with the American Cancer Society, caution that the test is not the breakthrough in universal screening that many hope for. The implications of false positives and the emotional toll of cancer highlight the need for more reliable screening methods.
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