After surgery, ADT and salvage radiation failed I was put back on Eligard + Xtandi. I sought out and received spot radiation to my 3 pelvic (approximately 1.5 cm diameter) lymph gland mets + area radiation to my internal pelvic lymph nodes. I then quit the chemicals due to many serious side effects. It has now been 19 months, my PSA is less than 0.003 ng/dL.
I opted for the spot radiation and it has apparently been successful. Your mileage my vary, of course.