Prostate cancer is divided into stages to indicate how advanced the cancer is.
While there are several methods to grade prostate cancer, Duke Cancer Institute physicians use the Gleason scale, a system of grading prostate cancer tissue based on how it looks under a microscope.
Gleason scores range from 2 to 10 and indicate how likely it is that a tumor will spread.
A low Gleason score means the cancer tissue is similar to normal prostate tissue and the tumor is less likely to spread; a high Gleason score means the cancer tissue is very different from normal and the tumor is more likely to spread.
Most men with early-stage prostate cancer have a Gleason score of 6 or 7.
Learn more about prostate cancer:
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