From the discussion of the STAMPEDE paper...
"It is possible that other forms of local treatment—such as radical prostatectomy—might also be effective. If the benefit of radiotherapy is mediated by local tumour eradication, one would expect surgery to be at least as effective. However, radiotherapy might be effective via other mechanisms (eg, immune modulation),
so the role of surgery in men with metastatic prostate cancer remains unproven. The feasibility of prostate surgery in this setting is being tested in the g-RAMMP trial (
NCT02454543) and the TROMBONE feasibility study."
Of course if you don't need evidence and can't read then the point is moot.