The Gleason score is a grading system for prostate cancer that rates tumors on a scale of six to 10. It is one of several diagnostic tools doctors use to understand a patient’s cancer and develop a treatment plan. Cancers on the low end of the scale grow slowly and are less likely to spread.

According to the statement, Biden, 82, was diagnosed with cancer on Friday, May 16, upon a medical check after experiencing “increasing urinary symptoms.” It added that Biden’s cancer was characterized by a Gleason score of 9, with metastasis to the bone.

Former President Joe Biden has been diagnosed with a form of severe prostate cancer that has metastasized in his bones, according to a statement from his office issued Sunday."Last week, President Joe Biden was seen for a new finding of a prostate nodule after experiencing increasing urinary symptoms,