As some of the follow-up comments for the original article point out, this was a small study. Extrapolating from "not much" is dangerous.
In any case, it seems to come down to (a) comorbidities, and (b) metastasis/recurrence. If you don't get recurrence, then your life expectancy is mostly up to your lifestyle/vices and your genes (comorbidities). Sloan-Kettering and U Montreal, among others, have nomograms on the probability of metastasis/recurrence for various fact situations, and Sloan-Kettering has one for general life expectancy without PC given race and current age.
Just bear in mind that the survival numbers in those nomograms that give 10 year expectancy, for example, are based on guys that had surgery at least
10 years ago. Things have gotten better since.
However, the "1 percent in 15 years" figure is one that I can't cross-foot with anything I know from other sources. Maybe 15 percent in 15 years, given the Gleason 6-7 number that the article quotes.
Larry ShickPersonal homepage incl. PCa story: www.sv-moira.com
(age 60) biopsy PSA 4.4, free PSA 9%, T2c stage, Gleason 7 (3+4), 7 of 14 cores; 6'2", 200 lbs.03/09: Robotic surgery
(Dr. Kawachi, City of Hope) 47 gms, 10% involved, staging/Gleason unchanged (pT2cNXMX), margins clear, no ECE/sem ves involvement, fully continent from day 1, some success w/Viagra 50mg/day.Followup: 05/09 0.006