The grading system usually ranges from 6 to 10. Biden's diagnosis of a Gleason score of 9 indicates his cancer is aggressive.

In medicine, technological advances and breakthroughs happen at lightning-paced speeds. But in the realm of prostate cancer, one major development, the Gleason grading system for tumors, has stood the ...

The Gleason score is calculated by adding together the two grades of cancer cells that make up the largest areas of the biopsied tissue sample, the NIH says. The grading system usually ranges from ...