His Majesty has taped a first-hand account about his experience with cancer, scheduled for transmission as part of this year's Stand Up To Cancer campaign, spearheaded by a leading cancer charity and Channel 4.
Official sources confirmed the King would discuss his "healing process" as a person living with the disease, in a televised statement on this Friday at the evening slot.
The recording, taped inside Clarence House a fortnight ago, will emphasise the importance of cancer screening checks to ensure more people catch the disease at an initial point.
This constitutes a uncommon insight on the wellbeing of the King, who has been receiving ongoing care since revealing his diagnosis in early last year. But it is thought improbable the King will disclose his particular diagnosis.
The annual charity initiative each year generates donations for clinical trials and treatment and prompts people to get check-ups to increase the chances of an prompt identification.
The King's public discussion about his condition, and his experience as a patient, has been designed to raise awareness and to persuade more people to get checked - and this will be advanced with this unusual personal contribution.
Up until now the King's key philosophy to his cancer has been to continue his schedule, maintaining a full diary in spite of his regular rounds of treatment, and he seems not to have sought to be overshadowed by his illness.
Recently has seen the King, 77, undertaking several foreign visits, notably to Italy and Canada, and receiving the highest tally of inward state visits to the UK for decades, featuring the German president in recent days.
The upcoming Stand Up to Cancer show on Channel 4, featuring presenters like Davina McCall, Adam Hills and Clare Balding, will appeal to people not to be afraid of getting cancer checks.
Each presenter have been personally touched by cancer - Davina McCall disclosed in November she had undergone surgery for a tumour, while Balding was diagnosed with a thyroid condition over a decade ago. Host Adam Hills has previously spoken about his father, who had stomach cancer and then later another illness.
The broadcast will appeal to the roughly nine million people in the UK who charities says are not compliant with public health checks, with an website to let people see if they are able for tests for key health indicators.
In an effort to clarify screenings and demonstrate the value of timely identification there will be a direct feed from hospital departments at two Cambridge hospitals in Cambridge.
"The goal is to take the fear out of preventative tests and demonstrate everyone that they are not isolated in this," stated one of the hosts.
At present in the UK, there are a number of national health screening services - for major health concerns - available to eligible individuals.
A emerging preventative initiative is also being gradually implemented for anyone at increased risk of contracting the condition, focusing on people aged 55-74 years old, who have a smoking history or used to.
Men may enquire about specific tests, but there is not a universal scheme currently available.
The fundraising initiative, which has collected a significant sum since 2012, is funding 73 medical projects involving many patients.
The Monarch, in a message for attendees at a gathering for related organisations in the spring, had discussed recognising the "intimidating and at times alarming reality" for patients and their loved ones.
But he said his first-hand encounter of living with cancer had demonstrated that "the darkest moments of disease can be alleviated by the kindness of others," as he praised those who looked after cancer patients.
Official sources has not disclosed the specific type of cancer the King has, or the therapies he has been given. The King's cancer was discovered after he had undergone a prostate procedure.
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