They all produce false negatives to the extent that there can be micrometastases too small for them to detect, but PSMA-PET is the most sensitive of the three (and also, I think, the "noisiest").

So no scan or blood test will tell us we're cancer-free — that medical technology doesn't exist yet. The best they can tell us is "nothing has grown big enough to show up on our radar yet." 😕

(But that said, I think results from the multi-faceted STAMPEDE trial suggested that if your metastatic prostate cancer remains castrate-sensitive for 5 years, you have a high chance of having entered long-term remission
🤞).