Hunter Biden says his father's prostate cancer is causing him pain even as he continues to speak outFormer U.S. President Joe Biden's prostate cancer has spread to other parts of his body and is causing him pain, his son Hunter said in an interview. Former U.S. President Joe Biden's prostate cancer has spread to other parts of his body and is causing him pain, his son Hunter said in an interview. Former U.S. President Joe Biden's prostate cancer has spread to other parts of his body and is causing him pain, his son Hunter said in an interview. Former U.S. President Joe Biden's prostate cancer has spread to other parts of his body and is causing him pain, 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.