Biden's cancer diagnosis raises fresh questions about his health in White House

Joe Biden's announcement that he has been diagnosed with prostate cancer has revived questions about what health issues the former US president was dealing with while he was in the White House.

In a statement on Sunday, Biden's office said the 82-year-old had received the diagnosis on Friday after seeing a doctor for urinary symptoms.

Some doctors have expressed surprise that the aggressive form of cancer, which has spread to his bones, was not detected earlier.

Others pointed out that cancers can grow fast without the patient displaying symptoms - and that men over 70 are not routinely screened.