“Last week, President Joe Biden was seen for a new finding of a prostate nodule after experiencing increasing urinary symptoms,” his personal office said in a statement. “On Friday he was diagnosed with prostate cancer, characterized by a Gleason score of 9 (Grade Group 5) with metastasis to the bone.”

The aggressiveness of a cancer is based on several factors, including the tumor's grade and stage, and the cells' genetic fingerprint.

Former President Joe Biden was diagnosed with an aggressive form of prostate cancer, his office announced on Sunday. The Democrat, who was experiencing urinary symptoms, was diagnosed on Friday following the discovery of a nodule on his prostate.