I have seen, what seems like, quite a few people talk about
Dr. Epstein @ Johns Hopkins and he seems to be considered as an authority on Geason scores of slides.
Here is a post I found by doing a search of this site using the term "johns hopkins slides".
Someone said...
My biopsy slides were sent to Dr. Jonathan Epstein at Johns Hopkins for a second opinion. My urologist initiated the request and the pathology lab here in Seattle sent them to JHU.
I had a confirmatory second opinion on the slides back in about 10 days. Dr Epstein confirmed the positive biopsy and the Gleason score of 3+3.
My post-prostatectomy pathology slides were not sent to Johns Hopkins.