King Charles III is expected to use his annual Christmas message to highlight health workers, at the end of a year in which both he and the Princess of Wales were diagnosed with cancer.

King Charles III was diagnosed with cancer this year after treating an enlarged prostate. His daughter-in-law, Kate Middleton, completed chemotherapy in September.

King Charles has used his annual TV message to give personal thanks to the medical staff who have cared for him this year. Charles announced his cancer diagnosis in February, the same time as his daughter-in-law Kate shared she was having abdominal surgery.

The Finale" proved a winner for the BBC in the U.K. Christmas Day ratings battle. The long-awaited 90-minute special, which was written and exec produced by stars James Corden and Ruth Jones, pulled in 12.

The British monarch recorded his annual holiday address from the chapel of a former hospital, rather than from a palace.

King Charles III and Kate Middleton both announced this year they have cancer. Middleton revealed in September that she completed chemotherapy treatment.

King Charles, Queen Camilla and other members of the royal family participated in the Christmas walk to St. Mary Magdalene Church at Sandringham in Norfolk.

Charles offered his “heartfelt thanks” to medical staff who offered “strength, care and comfort” during cancer treatment