Former U.S. President Joe Biden’s prostate cancer has spread to other parts of his body and is causing him pain, even as he continues to speak out on public issues, his son Hunter said in an interview. In a wide-ranging interview with the BBC broadcast late on Friday, Hunter Biden grew emotional as he discussed his father’s condition, describing it as very sad to watch. Video above: Former President Joe Biden pardons son, Hunter, breaking previous promise not to“The cancer has spread, metastasized into his bones and further,” he said. The former president revealed his cancer diagnosis in May of last year, less than four months after he left the White House. Hunter Biden said the diagnosis had been tough on the family.