Thanks very much for the replies. It looks like PSA after SRT really isn't any different than after sugery. Even if it goes into remission there isn't any way of knowing if it will stay in remission. After my first post surgery PSA my uro told me to plan on getting tested the rest of my life. I guess he wasn't kidding.
Mag, you and I are about the same age. While none of us want to have to deal with a recurrence, it seems that by the mid seventies, the need to do something becomes a lot less urgent than for the young guys like Tony, Alf, Gordy, Galileo and many orthers on the forum.