Former President Joe Biden's prostate cancer has spread to other parts of his body, including his bones, and is causing him significant pain, his son Hunter Biden said in an interview broadcast Friday. Speaking with the BBC's "Newsnight," Hunter Biden grew emotional as he described his father's condition. Despite the cancer's progression, Hunter Biden said his father remains active and engaged in public life. A spokesperson for Joe Biden did not immediately respond to a request for comment following Hunter Biden's remarks. This report discusses a serious cancer diagnosis; readers seeking information about prostate cancer symptoms or treatment should consult a qualified medical professional.