"During The King's recent hospital procedure for benign prostate enlargement, a separate issue of concern was noted. Subsequent diagnostic tests have identified a form of cancer," Buckingham Palace said in a statement.
Charles underwent a "corrective procedure" last week at The London Clinic after the palace previously announced that the monarch, 75, was seeking treatment for an enlarged prostate. His wife, Queen Camilla, told people at the private hospital that the king was "doing well." His daughter-in-law, Princess Kate, was receiving care and recovering from abdominal surgery at the same facility.