20-year-long study finds prostate cancer screening doesn’t cut death riskApril 1st, 2011 - 4:44 pm ICT by ANI
London, April 1 (ANI): A 20-year-long study has found that screening men for prostate cancer does not significantly reduce deaths from the disease, but increases the risk of treating many people unnecessarily.
The findings are based on a trial started in Sweden in 1987 involving 9,026 men aged 50-69 years identified in the National Population Register.
From this population, 1,494 men were randomly selected for screening every third year from 1987 to 1996. The remaining 7,532 men acted as controls.
On the first two occasions, screening was done by digital rectal examination only. From 1993, this was combined with prostate specific antigen (PSA) testing. On the fourth occasion (1996), only men aged 69 or under at the time of the investigation were invited.
All men with cancer diagnosed up to December 31, 1999 were included in the analysis. Survival was followed until December 31, 2008.
There were 85 cases of prostate cancer diagnosed in the screened group and 292 in the control group. The tumours in the screening group were smaller and more often localised than in the control group.
Analysis did not show significantly longer survival or overall survival for men with prostate cancer in the screened group compared with the control group.
And while screening and treating men with detected tumours might reduce deaths specifically from prostate cancer by up to a third (at best), this would be at considerable risk of worrying overdetection and unpleasant or harmful overtreatment.
Indeed, a previous trial found that to prevent one death from prostate cancer, 1,410 men would need to be screened and 48 treated.
The authors believe that men should be fully informed about the potential hazards of treatment, and the psychological effects of false-positive test results, before they are screened.
The study has been published online in BMJ.com. (ANI)
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