The Gleason grading system is composed of a Gleason grade and a Gleason score, the latter of which is the result of the two most common grades present in the tumor.

The Gleason grading system, or Gleason score, refers to how likely the cancer is to advance and spread, but does not predict the outcome.

HALO Prostate AI showed very high accuracy in the large multi-institutional study for tumor detection and Gleason Grading in prostate biopsies.