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@gently

johnny8924,
I laughed when I read your question (the answers too) because I never thought to ask. Your PSA and Testosterone will be low as long as the Orgovxy is working, so that isn't a good clue. While the oncologist is planning a PSMA/PET a year after stopping Orgovyx, I think the extra PET is unusual.
I guess we just trust the radiation until PSA rises, but is that a measure while on ADT.
Did they do a CT scan weekly with the EBRT. Those would show the tumor.
I know you are going to ask when you see the oncologist. Let us know what he says.

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Replies to "johnny8924, I laughed when I read your question (the answers too) because I never thought to..."

A PET scan uses less radiation than a CT scan, So it does make sense to use it more frequently.

One of the guys over in last week’s Advance prostate cancer Ancan.com meeting, said that he was having PSMA Pet scans every three months. Advanced case, close monitoring.