A urologist I met some time ago told me that in the pre-MRI era almost all biopsies were negative. In fact, doing a biopsy of a prostate with a clean MRI means sampling at random!. If there is a small cancer, finding it will just be a matter of luck. If only cancer-free areas are sampled, the result will be a clean biopsy, even if cancer is present. So in that case not even a biopsy could give us an answer that we can trust 100%. And this is another reason why I have so far given up on doing the biopsy.
Yesterday I contacted my urologist. He told me that it is possible to do the biopsy under anesthesia, but he asked me to do a new MRI first. I will do it. I therefore have to contact the radiologist and in doing so I will take the opportunity to ask him if a PSMA PET scan could be right for me.
Thanks to every body and good luck.