Data from the world’s largest prostate cancer screening study provides further evidence to support the introduction of a targeted screening program for the disease, say researchers.
In 2009, the European Randomised Study of Screening for Prostate Cancer (ERSPC) showed that screening can reduce mortality from prostate cancer by between 20-35 percent. But the earlier and more frequent diagnoses which screening enables, also mean men spend longer living with their cancer – and concerns have persisted about the impact of this on their quality of life.
The new analysis – presented today at the European Association of Urology annual congress (EAU22) – reveals that men who undergo screening spend longer in the earlier stage of the disease without signs of progression, where quality of life is known to be the least impaired. As the treatment the men receive is the same, however, men in whom the cancer was detected in normal clinical practice see their disease progress faster after diagnosis. However, if the disease metastasizes, the number of years men spend with metastatic disease is similar across both groups.
The researchers, from the Erasmus MC Cancer Institute at University Medical Center Rotterdam, analysed data from just over 43,000 men in the Dutch cohort of the ERSPC. The ERSPC recruited over 180,000 men across eight countries in the 1990s, with half randomized to enter a prostate cancer screening programme of regular PSA tests.
The new study looked at how long it took before men saw their prostate cancer progress to different stages of the disease following diagnosis. These stages were:
- Biochemical recurrence – when men whose prostate cancer has been treated with radiotherapy or surgery show a high level of prostate-specific antigen (PSA), indicating that the disease has returned.
- Metastatic disease – when the cancer has spread beyond the prostate to other organs of the body and so is untreatable.
The results show that men in whom the disease is detected through a screening programme remain on average a year longer without progression. In men where the disease has progressed, if it becomes metastatic, then this is on average two and a half years later in men in screening, compared to those whose cancer was detected outside the screening programme.
Sebastiaan Remmers, from the Erasmus MC Cancer Institute, who will present the research today [Saturday 2 July 2022] at EAU22, said: “No-one wants to be confronted with a cancer diagnosis, and screening means more men know they have prostate cancer and live longer with that knowledge. While screening can lead to overdiagnosis, our research shows it can also postpone – or even avoid – the harm that prostate cancer can bring. That tips the balance in favor of further developing organised individualized screening programs.”
Prostate cancer screening is standard in only a few European countries or regions, including Lithuania and parts of Sweden. Most other countries, including the UK, do not systematically screen men for the disease due to concerns about overdiagnosis and overtreatment. PSA tests tend instead to be carried out on an ad hoc basis when patients go to their doctors with concerns.
Professor Monique Roobol, from the Erasmus MC Cancer Institute, said: “Advances in how prostate cancer is diagnosed and treated have changed the balance of risks and benefits associated with screening for the disease. We can reduce the detection of low-risk cancers considerably by adequate risk stratification. In addition, in the past, diagnosis automatically meant radical treatment, such as surgery or radiation, which all have side effects. Now we have other options for low-risk cancers, such as active surveillance including MRI scans, which have a more limited impact on men’s quality of life. Given that screening reduces mortality and metastatic disease, and – as our – research shows – gives men more years in those stages of the disease that have less impact, then the arguments against screening are becoming outdated.”
The European Association of Urology, the leading authority within Europe on urological practice, research and education, is calling for prostate cancer screening to form part of the European Union’s new ‘Beating Cancer’ plan. The EAU recommends a risk-based approach to prostate cancer screening, which would calculate the appropriate screening frequency and follow up for each patient based on factors such as PSA level, family history, ethnicity, gene mutation and prostate size.
Professor Hendrik Van Poppel, from Katholieke Universiteit Leuven in Belgium, who chairs the EAU Policy Office, said: “Prostate cancer is one of the leading causes of death in men in Europe: number one in Sweden, number two in Germany and number five in many other countries. In the UK, more men die of prostate cancer each year than women from breast cancer. Despite this, we still have no European-wide screening program for prostate cancer.
“The systematic and personalized approach to screening advocated by the EAU will significantly reduce the likelihood of over-diagnosing or over-treating cancers that pose minimal threat. But, most importantly, it will preserve the best possible quality of life for prostate cancer patients, and it will save lives.”