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.

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.