Most men over 50 know that prostate cancer is a risk that quietly climbs with age. The usual tools catch it only once the disease is already underway. Scientists have long wondered whether the body leaves earlier fingerprints.
A new study from Oxford Population Health suggests it does. Blood samples from more than 2,500 men, taken between 1992 and 2000, contained a dozen proteins that looked different in those who went on to develop prostate cancer more than 15 years later.
The work was published October 21, 2026, in European Urology.
The researchers drew on EPIC, the European Prospective Investigation into Cancer and Nutrition. They compared 982 men who later developed prostate cancer with 1,573 men who did not, and they measured more than 6,000 proteins per sample.
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What the proteins seem to reveal
Twelve proteins stood out as linked to prostate cancer diagnosed more than a decade later. Seven were tied specifically to aggressive disease, including cancers that had spread or ultimately proved fatal.
One protein called ANKRD1 kept turning up in those serious cases. Several others connected to well-known cancer genes with names like ERBB3, KRAS and NRAS.
Finding their protein signatures in blood years before any symptoms is new, and points to processes going on long before any tumor is clinically visible.
Another standout was Granzyme K, a protein made by immune cells that find and destroy abnormal cells. Men with higher levels of it had a lower long-term risk, suggesting the immune system may hold the disease in check for years before it slips through.
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Why this is not yet a screening test
These findings are leads, not a ready test. The results came from one European cohort and will need to be confirmed in larger and more diverse groups before any clinical tool could be built on them.
No blood test exists today that uses these markers to flag future prostate cancer risk.
For men already in the age range where screening is routinely discussed, nothing has changed today. PSA testing and a digital exam remain the standard way of getting checked for prostate cancer in a doctor's office.
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This article is made and published by Mie Hermansen, who may have used AI in the preparation.