Epstein is the Gold Standard. You can call Epstein's lab and ask for clarification if you wish. You can also ask the pathologist at Cedars to call Epstein to see if they can reach a consensus.
That's quite a difference. If it is GS 3+4, and I hope it is, all options are on the table: surgery, brachy monotherapy (seeds or temporary implants), or SBRT. If it is GS 4+5, there is one clearly superior option, in my opinion, and that would be brachy boost therapy with hormone therapy.
Allen - not an MD
•PSA=7.3, prostate volume=55cc, 8/17 cores G6 5-35% involvement
•SBRT 9 yr onc. results
•SBRT 7 yr QOL results
•treated 10/2010 at age 57 at UCLA,PSA now: 0.1,no lasting urinary, rectal or sexual SEsmy PC blog