Hi seuell, - There is no question that you have definitely had a recurrence of your Prostate Cancer (PCa) and salvage radiation is considered the last chance for a possible "cure" of the disease. Unfortunately, it will only be potentially successfull if your recurrence is a "localized" one and is not already, more advanced, "systemic" disease.
This is often very difficult to determine, and since you give no post-operation details of pathology found and/or sequential monitoring PSA history, any recommendation as to secondary treatment would be pure guessing, rather than informed and thoughtful consultation.
Overall, Salvage Radiation is effective in about 50% of the cases in 5 year statistics and something less than that, in 10 year results, which reflects the problems with confidently identifying the source of a recurrence.
The probable reality is, that at 71 y/o, you need to decide whether the POTENTIAL for cure is sufficient to risk the POTENTIAL morbidity (side effects) of further "intent to cure" treatment. But this should be an INFORMED decision based upon the most reliable information available, about your SPECIFIC situation.
With an actuarial life expectancy of about 12.5 years, the question that needs to be posed, is it necessary to cure your disease or is it more logical, based on what you learn, to try and effectively CONTROL the now chronic disease until you will most likely die of some other fatal malady.
All of these considerations depend on such facts as the extent of any residual effects from your surgery, existing co-morbidities, general health and your present life style at 71. There is lots to think about and seeking guidance from the professionals, available to you, who have the availability of ALL your records is wise.
I would suggest that, in addition to your Urologist, you have consultations with a Radiological Oncologist and a Medical Oncologist, before deciding on your next treatment decision. Good luck! - John@newPCa.org (aka) az4peaks