Former US President Joe Biden’s prostate cancer has spread beyond his bones and is very painful, his son, Hunter Biden, said in an interview with the BBC. “The cancer has spread, metastasised into his bones and further,” Hunter Biden told BBC’s Newsnight, according to video posted online on Friday. A Biden spokesman said in October he was undergoing radiation treatment and hormone therapy. Biden’s son said his cancer had spread to his bones and beyond. Biden recently attended the dedication of Barack Obama’s presidential library in June in Chicago, after serving as Obama’s vice president from 2009 to 2017.