The Monarch has recorded a personal message regarding his battle with cancer, which will be broadcast as part of this year's annual cancer awareness drive, organised by medical research organisations and Channel 4.
Official sources confirmed the King would discuss his "recovery journey" as a individual battling cancer, in a recorded address on Friday evening at 20:00 GMT.
The recording, recorded at his London residence a fortnight ago, will highlight the critical nature of routine screenings to ensure more people catch the disease at an initial point.
This will be a uncommon insight on the wellbeing of the King, who has been receiving ongoing care since the news was shared in the start of 2024. However, it is believed doubtful the King will disclose his type of cancer.
The awareness initiative each year raises funds for scientific studies and therapies and encourages people to get screenings to boost the probability of an prompt identification.
The King's candid approach about his condition, and his experience as a patient, has been designed to raise awareness and to get more people to get screened - and this will be taken a step further with this unique direct participation.
Up until now the King's main approach to his cancer has been to keep working, upholding a full diary alongside his frequent sessions of treatment, and he is understood not to have sought to be defined by his illness.
Recently has seen the 77-year-old Monarch, taking several international tours, such as visits to Italy and Canada, and receiving the highest tally of official guests to the UK for a generation, including the German president last week.
This Friday's Stand Up to Cancer broadcast on Channel 4, featuring presenters like several TV personalities, will encourage people not to be afraid of getting preventative tests.
Each presenter have been personally touched by cancer - McCall revealed last month she had had an operation for breast cancer, while Clare Balding was overcame the illness over a decade ago. Host Adam Hills has previously mentioned his late father, who had a diagnosis and then later another illness.
The programme will reach out to the estimated nine million people in the UK who charities says are not current with national health programmes, with an digital tool to let people determine if they are qualified for screenings for breast, bowel and cervical cancer.
In an effort to clarify screenings and show the benefit of prompt detection there will be a live broadcast from cancer clinics at two Cambridge hospitals in Cambridge.
"I want to reduce the stigma out of preventative tests and show all people that they are not on their own in this," stated one of the hosts.
At present in the UK, there are several key national health screening services - for specific cancers - accessible for eligible individuals.
A new preventative initiative is also being phased in for people at increased risk of being diagnosed with the disease, specifically targeting people in a specific age bracket, who currently smoke or were former smokers.
Men may request prostate screenings, but there is not a universal scheme in place.
The fundraising initiative, which has raised £113m over the past decade, is supporting 73 clinical trials encompassing 13,000 patients.
His Majesty, in a statement for dignitaries at a gathering for support groups in April, had referred to understanding the "daunting and at times frightening situation" for those diagnosed and their support networks.
But he stated his personal journey of coping with cancer had revealed that "the most difficult times of sickness can be alleviated by the support of carers," as he thanked those who looked after those receiving treatment.
Royal representatives has not disclosed the nature of cancer the King has, or the medical care he has received. The King's cancer was detected subsequent to he had had a prostate procedure.
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