Screening for prostate cancer could help save lives, study suggests

An MRI scanner. Picture: Christopher Furlong/PA Wire

Using MRI scans to screen men for prostate cancer could reduce deaths from the disease “significantly”, researchers have suggested.

Scientists said current tests, which detect the level of the protein prostate-specific antigen (PSA) in the blood, have been linked to over-diagnosis and over-treatment of low-risk cancer.

Prostate cancer is the most common cancer found in men and, at the moment, those aged over 50 can request a PSA test if they are experiencing symptoms.

The Reimagine study invited 303 men aged between 50 and 75 to have a screening MRI and a PSA test.

Of the total, 48 (16%) had an MRI that indicated the presence of prostate cancer despite having a median PSA density.

Of the group, 32 had lower PSA levels than the current screening benchmark of 3ng/ml, meaning they would not have been referred for further investigation.

After assessment, 29 men were diagnosed with cancer that required treatment, 15 of whom had serious cancer and a PSA of less than 3ng/ml.

Three men (1%) were diagnosed with low-risk cancer that did not require treatment.

The study was led by University College London, University College London Hospitals NHS Foundation Trust and King’s College London and is published in medical journal BMJ Oncology.

Prof Caroline Moore, consultant surgeon at UCLH, chief investigator of the study and NIHR research professor, said the findings are “sobering” and “reiterates the need to consider a new approach to prostate cancer screening”.

“Our results give an early indication that MRI could offer a more reliable method of detecting potentially serious cancers early, with the added benefit that less than 1% of participants were ‘over-diagnosed’ with low-risk disease,” she added.

Prof Mark Emberton, consultant urologist at UCLH, said: “The UK prostate cancer mortality rate is twice as high as in countries like the US or Spain because our levels of testing are much lower than other countries.

“Given how treatable prostate cancer is when caught early, I’m confident that a national screening programme will reduce the UK’s prostate cancer mortality rate significantly. There is a lot of work to be done to get us to that point, but I believe this will be possible within the next five to ten years.” Nick James, a professor of prostate and bladder cancer research at the Institute of Cancer Research in London said the study “further reinforces the value of MRI in the diagnostic pathway for prostate cancer”.

“The well-known limitations of the old PSA-based screening studies of over- diagnosis and linked over-treatment are increasingly mitigated by the use of MRI,” he added.

“Similarly, MRI can also spot cases of prostate cancer in patients with normal PSA levels, who would have been missed using PSA only screening programmes.” 

Prof Mike Richards, chairman of the UK National Screening Committee (NSC), said the organisation does not currently recommend prostate cancer screening “because there is no clear evidence that the benefits outweigh the harms”.

However, it is preparing to look at various proposals.

He added: "These results are extremely exciting, and we now want to see much larger, UK-wide studies to understand if using MRI as the first step in getting tested could form the basis of a national screening programme."

Another trial, known as Limit, is being conducted with a much larger number of patients, which the research team said is the “next step towards a national prostate screening programme"