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Blood-Based Cancer Screening Tests: How Reliable Are They?

Early detection has long been one of the most powerful weapons against cancer. When cancer is found early—often before symptoms begin—treatment is more effective, less aggressive, and survival rates are significantly higher. Traditionally, cancer screening has relied on imaging tests, invasive procedures, or organ-specific methods such as mammograms, colonoscopies, Pap smears, and biopsies.

In recent years, a new approach has captured global attention: blood-based cancer screening tests. Often referred to as liquid biopsies, these tests promise to detect cancer using a simple blood sample. The idea is compelling—minimal discomfort, broader detection, and the potential to identify cancer at an earlier stage than ever before.

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