Hi Zebra,
there are many of us chaps where surgery has been a failure from the beginning resulting in early salvage radiotherapy being needed.
I don't know what the figures are for complete failure of surgery to clear the cancer but it must be a significant number as lots of us have to have salvage treatments.
It is indeed a heavy blow to find the ordeal of surgery was ineffective and more treatment must follow.
ADT is usually not now required for a PSA level below 0.5 according to the POSEIDON TRIAL published in The Lancet this year.
10 year Survival rates are quoted as 84.3% with ADT and 83.6% without so no real difference.
IF ADT is used 6 months or so seems to be enough rather than the usual two years
There IS a significant reduction in 10 year Metastasis free survival where 77.9% plays 74.1% p <0.001 so might be worth considering if you are offered it.
Al