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Blood test which confirms prostate cancer could prevent 70pc of biopsies
A simple blood test which confirms the presence of prostate cancer could prevent 70 per cent of painful biopsies, scientists believe.
Researchers at Nottingham Trent University and University Hospitals Leicester NHS Trust have discovered that the immune system changes when cancer is present, and that difference can be picked up in the blood.
Nearly 50,000 men are diagnosed with prostate cancer every year in Britain, while many thousands more will develop symptoms which will turn out to be harmless.
“This test has the potential to spare men with non-cancerous disease or low-risk cancer from unnecessary invasive diagnostic procedures and tests,” said Professor Masood Khan, consultant urologist at University Hospitals Leicester NHS Trust and Visiting Professor at Nottingham Trent.
Men are currently screened for the potential presence of prostate cancer using a blood test which look for prostate specific antigen, a biomarker which rises when the disease is present in the prostate.
However readings vary between individuals and naturally rise as people age.
The current test is further complicated by the fact that elevated levels of the antigen do not necessarily mean that the man has prostate cancer, while a normal reading does not exclude its presence.
The new test, which has so far been trialled using samples from 72 men, would be used following a PSA test to help doctors decide whether a high PSA reading really does mean cancer.
As well as being able to discount cancer altogether, it has the potential to spare men with no cancer, or low-risk cancer, from having to undergo biopsies and other diagnostic procedures and tests.
“Although the PSA blood test is commonly used to test for the presence of prostate cancer, it can be relatively non-specific,” said Professor Graham Pockley, Director of Nottingham Trent University’s John van Geest Cancer Research Centre.
“A particular challenge to the clinician is diagnosing the presence of prostate cancer in individuals who do not have symptoms of the disease, but do have a mildly elevated level of PSA in the blood. This study highlights the value of collaborations such as these.”
The new test monitors white cells in the blood, which are responsible for protecting the body against infection and cancer. Scientists have developed an algorithm which determines whether cancer is present based on how the cells are reacting.
Currently, under current government guidelines, men aged between 50 and 69 who have a PSA reading of 3 more are usually sent for a biopsy. But the new test could prevent 70 per cent of operations, which would also bring savings for the health service.
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