The Gleason Scoring System uses the numbers 1 to 5 to grade the most common (primary) and second most common (secondary) patterns of cells found in a tissue sample
- Grade 1: The tissue looks very much like normal prostate cells.
- Grades 2-4: Cells that score lower look closest to normal and represent a less aggressive cancer. Those that score higher look the furthest from normal and will probably grow faster.
- Grade 5: Most cells look very different from normal.