John Hopkins just released data on 470 Active Survelience patients of which 11% underwent radical surgery within 3 years of diagnosis. Findings:
Most disease progresses within 1-2 years, if it progresses.
This suggests under sampling of agressive tumors in the original biopsy.
Even with progresson most tumors had favorable pathology with 27% being insignificant.
A small % of men had significant disease.
Conclusion: The study indicates a strong potential of AS as a treatment strategy.
http://prostatecancerinfolink.net/2009/10/22/pathology-of-prostate-cancer-in-patients-after-active-surveillance/
I would strongly recommend that anyone considering AS get a color doppler ultrasound or a 3D mapping of the prostate to identify any agressive tumors that may have been undersampled. This would significantly reduce the number of men on AS ever needing treatment.
JohnT