Joe Biden's prostate cancer diagnosis reveals a high Gleason score, indicating aggressive cancer. Dr. Arpeet Shah and Dr.

A Gleason score is calculated after studying tissue samples under a microscope ... Gleason score.The lower the grade, the more cancer cells look like normal cells. A Gleason score of 8, 9 or ...

"It’s based on what the cancer cells look like under a microscope – specifically, how different they look from normal prostate cells," he said. (Shah was not involved in Biden's care.) ...