In the old Gleason system, which goes from 6 to 10, Biden’s Gleason score is a 9, which is “among the most aggressive types [of prostate cancer],” said Dr. Jason Efstathiou, a radiation oncologist at Mass General Brigham in Boston.

Former President Joe Biden's office announced on Sunday that he was diagnosed with an "aggressive" form of prostate cancer. Biden's office said the cancer was diagnosed after "increasing urinary symptoms" and that it has metastasized,