The test can also quickly detect if prostate cancer is evolving genetically and might be becoming drug-resistant.
'We think this is one of the biggest survival benefits ever reported in a trial of an adult solid tumor,' said one expert.
Ben Stiller underwent surgery two years ago and is now cancer-free.
A new analysis suggests infrequent screening has resulted in an increase in the number of men diagnosed with a form of the disease.
Several mutations in the most aggressive form of the disease may respond to drugs used for other cancer types.
The Prostate Cancer Foundation returned a $17,000 donation from Reddit because it doesn't want to be associated with the site, a spokeswoman said