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.
"It's very painful, and it's very debilitating in many respects."
A spokesman for the 83-year-old Democrat declined on Saturday to comment on Hunter Biden's interview.
Biden revealed in May 2025, less than four months after he left the White House, that he had been diagnosed with an "aggressive form" of prostate cancer, saying at the time that it had spread to his bones.
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A Biden spokesman said in October he was undergoing radiation treatment and hormone therapy.
Biden was the oldest person to win the US presidency at the time of his election in 2020.
Biden's physical health and mental acuity drew scrutiny during his 2021 to 2025 presidency.
Biden attended the dedication of Barack Obama's presidential library in June in Chicago. Biden served as Obama's vice president from 2009 to 2017.
Biden's presidential memoir is scheduled for release on 17 November.
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