King Charles has recorded a intimate address about his experience with cancer, which will be broadcast as part of this year's Stand Up To Cancer initiative, run by Cancer Research UK and a television broadcaster.
The royal household said the King would reflect on his "recovery journey" as a cancer patient, in a recorded address on Friday evening at the evening slot.
The recording, filmed within a royal residence a fortnight ago, will emphasise the importance of cancer screening checks to increase the likelihood more people catch the illness at an treatable phase.
This represents a rare update on the health of the Monarch, who has been receiving ongoing care since revealing his diagnosis in the start of 2024. But it is thought doubtful the King will identify his type of cancer.
The annual charity campaign each year collects money for medical research and therapies and encourages people to get check-ups to improve the chances of an prompt identification.
The King's candid approach about his health challenge, and his experience as a patient, has been aimed to raise awareness and to encourage more people to get checked - and this will be advanced with this exceptional direct participation.
To date the King's primary strategy to his cancer has been to keep working, upholding a full diary alongside his ongoing course of treatment, and he is understood not to have sought to be defined by his diagnosis.
The past twelve months has seen the King, 77, embarking on several overseas trips, such as visits to Italy and Canada, and hosting the highest tally of inward state visits to the UK for almost 40 years, which included the German president recently.
This Friday's Stand Up to Cancer programme on television, featuring presenters like a team of famous hosts, will encourage people not to be frightened of getting health screenings.
Each presenter have been personally touched by cancer - McCall revealed recently she had had an operation for breast cancer, while Clare Balding was treated for a thyroid condition more than 15 years ago. Comedian Adam Hills has previously mentioned his late father, who had one form of cancer and then later blood cancer.
The show will appeal to the approximate 9m people in the UK who Cancer Research UK estimate are not up to date with national health programmes, with an online checker to let people see if they are eligible for examinations for key health indicators.
In an attempt to clarify health tests and illustrate the importance of prompt detection there will be a real-time transmission from hospital departments at medical facilities in Cambridge.
"The goal is to reduce the stigma from health checks and demonstrate the public that they are not alone in this," commented Davina McCall.
Currently in the UK, there are a number of national health screening services - for specific cancers - offered to certain age groups.
A recently launched lung cancer screening programme is also being slowly rolled out for people at potential risk of developing the illness, specifically targeting people of a certain age, who are smokers or were former smokers.
Men may enquire about specific tests, but there is no national programme in place.
The Stand Up to Cancer initiative, which has raised £113m since 2012, is financing 73 research studies encompassing many patients.
His Majesty, in a address for guests at a reception for related organisations in the spring, had spoken of recognising the "overwhelming and at times frightening reality" for patients and their loved ones.
But he noted his personal journey of coping with cancer had demonstrated that "the darkest moments of sickness can be brightened by the kindness of others," as he praised those who supported cancer patients.
Official sources has not made public what kind of cancer the King has, or what treatment he has been given. The King's cancer was detected after he had had a routine operation.
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