Former President Joe Biden is being treated for prostate cancer, one of the most common cancers among men. Biden’s cancer is an aggressive form of the disease, and has spread to his bones, according to a statement released Sunday by his office.

“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.”