Former President Joe Biden has been diagnosed with an aggressive form of prostate cancer that has metastasized to the bone, according to a statement from his office. Dr. Ezekiel Emanuel, a former Obama administration official, suggested that Biden likely had the cancer during his presidency. Prostate cancer that has spread to the bone is considered Stage 4B with a 37% survival rate over five years. Biden’s Gleason score is nine out of ten, indicating the speed at which the cancer is spreading. Biden has a history of medical issues, including brain aneurysms and a pulmonary embolism in 1988.