King Charles has spoken of his "shock" at getting his cancer diagnosis during his return to public duties.
He was at a hospital as the first of his engagements when he was asked by a cancer patient how he was feeling.
"I'm all right, thanks. Not too bad," he replied.
The King had visited a cancer specialist centre in the middle of London with his wife Queen Camilla for the first of his major public appearances since his initial cancer diagnosis.
The monarch was diagnosed with the disease while he was hospitalised for treatment of an enlarged prostate in January at the London Clinic.
He was touring the Macmillan Cancer Centre at University College London Hospital on Tuesday (UK time) when he also revealed he would be going for further treatment himself later on in the day.
The King was also asked about his initial diagnosis by another patient, and while he did not reveal anything about the type of cancer he has, he told them: "It's always a bit of a shock isn't it, when they tell you."
The visit was a deliberately chosen one, with the appearance at the Macmillan Cancer Centre intended to raise awareness of the importance of early diagnosis.
It also follows the King's decision to make his own health issues public.
The King has not been seen in public since the traditional Easter church services, but the King's doctors were said to be "very encouraged by the progress made so far".
