As I said, it is too soon to investigate recurrence. He will have to monitor PSA every 3 months. If it goes over 2.0, that is called a biochemical recurrence (BCR). However, some radiation oncologists use a lower bar (say 1.0) if the pattern is steady or is rapid. If he has a BCR, he can get a PSMA PET scan to check for distant metastases, and an mpMRI of the prostate to see if there is a local recurrence.
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