Could you comment on research reports that Gleason 6 may not metastasize?

Could you comment on research reports that Gleason 6 may not metastasize?

Bela Denes, MD (urologist), describes two important studies concluding that true Gleason 6 prostate cancer does not metastasize.

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Bela Denes, MD (urologist), describes two important studies concluding that true Gleason 6 prostate cancer does not metastasize.
Bela Denes