Here is some evidence:
The New England Journal of Medicine
10-Year Outcomes after Monitoring, Surgery,
or Radiotherapy for Localized Prostate Cancer
F.C. Hamdy, J.L. Donovan, J.A. Lane, M. Mason, C. Metcalfe, P. Holding,
M. Davis, T.J. Peters, E.L. Turner, R.M. Martin, J. Oxley, M. Robinson, J. Staffurth,
E. Walsh, P. Bollina, J. Catto, A. Doble, A. Doherty, D. Gillatt, R. Kockelbergh,
H. Kynaston, A. Paul, P. Powell, S. Prescott, D.J. Rosario, E. Rowe, and D.E. Neal,
for the ProtecT Study Group*
September 14 2016 NEJMoa1606220
We compared active monitoring, radical prostatectomy, and external-beam radiotherapy
for the treatment of clinically localized prostate cancer. Between 1999 and 2009,
a total of 82,429 men 50 to 69 years of age received a PSA test; 2664 received a diagnosis
of localized prostate cancer, and 1643 agreed to undergo randomization to active
monitoring (545 men), surgery (553), or radiotherapy (545). The primary outcome was
prostate-cancer mortality at a median of 10 years of follow-up. Secondary outcomes
included the rates of disease progression, metastases, and all-cause deaths.
There were 17 prostate-cancer–specific deaths overall: 8 in the active-monitoring
group (1.5 deaths per 1000 person-years; 95% confidence interval [CI], 0.7 to 3.0),
5 in the surgery group (0.9 per 1000 person-years; 95% CI, 0.4 to 2.2), and 4 in
the radiotherapy group (0.7 per 1000 person-years; 95% CI, 0.3 to 2.0);
Summary from Table 1
Out of 1643 men followed for ten years, there were 17 deaths from prostate cancer. 63 men showed metastases.
So this major study in the USA last year showed a survival rate for prostate cancer of around 99% over ten years for men treated for localised prostate cancer. 96% had no metastases. I'll take those odds as a presumed cure. Furthermore, treatment today is more effective than it was ten years ago.