When your PSA falls to undetectable level than you know that you are in a remission and it can last for very, very long time. For some people it might last forever - meaning that person could possibly die from other causes before recurrence happen again.

Unfortunately, at this point, there is no way one can test and know if true "cure" was achieved and regardless of remission PSA tests will be performed for many years to come (to be on a safe side).

It is hard, but try not think about it in any other way but as a regular check-up , the same way you have your teeth checked twice a year and/ or you have a yearly regular physical.

Wishing you great success with RT therapy and complete eradication of PC !