Biden Reveals Diagnosis: Prostate Cancer Has Spread to His Bones

In depth

Joe Biden, former U.S. president, 83, revealed that he has been diagnosed with prostate cancer that has spread to his bones. He said his doctors are satisfied with the pace of his response to treatment.

Biden acknowledged that the illness is slowing his pace of activity. "There are good days and other days," he wrote in a personal message, adding, "It hasn't stopped me, but sometimes it slows me down."

The illness is limiting his ability to promote his memoir, "PROMISE ME, AMERICA", which is scheduled to be published on November 17. Biden said he hopes the written words will be enough, and that he will not be able to hold meetings and conversations around the book's launch as planned.