New findings concerning hereditary prostate cancer

It is a well-known fact that men with a family history of prostate cancer run an increased risk of developing the disease. The risk for brothers of men with prostate cancer is doubled. But a doubled risk of what, exactly? Prostate cancer my be an indolent condition that does not require treatment, or aggressive and fatal. Obviously, it makes a big difference whether a man has an increased risk of developing the indolent or the aggressive form, but until now these different risks have not been known.