What cancer screening is
Cancer screening is testing people without symptoms to detect cancer, or its precursors, at an early and more treatable stage. Established programmes include mammography, colonoscopy, cervical screening and low-dose CT for high-risk smokers; newer approaches include multi-cancer blood tests and whole-body MRI.
Why it matters for longevity
Catching cancer early is one of the clearest ways to add healthy years, so screening features prominently in preventive and “executive health” longevity offerings. But more testing is not automatically better: screening can find harmless findings that lead to anxiety, further tests and overtreatment.
What the evidence shows
For the established, guideline-backed screens in the right age and risk groups, the mortality benefit is well documented. For newer whole-body MRI and multi-cancer early-detection blood tests, evidence on real-world benefit versus false positives is still emerging, and guidelines are cautious.
Bottom line
Guideline-based screening for your age and risk is high-value; premium “scan-everything” packages need a clear-eyed view of false positives and follow-up harms.