His Majesty has taped a intimate address regarding his experience with cancer, set to air as part of this year's fundraising campaign, spearheaded by a leading cancer charity and Channel 4.
Official sources confirmed the King would discuss his "recovery journey" as a person living with the disease, in a televised statement on Friday evening at the evening slot.
The message, taped inside his London residence a fortnight ago, will stress the critical nature of routine screenings to help guarantee more people detect the condition at an initial point.
This represents a uncommon insight on the wellbeing of the King, who has been undergoing regular treatment since his condition was announced in the start of 2024. Analysts suggest doubtful the King will specify his specific form of cancer.
The annual charity initiative each year collects money for medical research and treatment and prompts people to get check-ups to increase the chances of an early diagnosis.
The King's candid approach about his illness, and managing the disease, has been intended to increase understanding and to encourage more people to get checked - and this will be taken a step further with this unique direct participation.
Up until now the King's key philosophy to his cancer has been to keep working, maintaining a hectic timetable alongside his regular rounds of therapy, and he is understood not to have desired to be defined by his condition.
The past twelve months has seen the Sovereign, embarking on several foreign visits, such as visits to Italy and Canada, and hosting the biggest number of official guests to the UK for a generation, which included the German president recently.
This Friday's charity broadcast on television, hosted by well-known figures such as Davina McCall, Adam Hills and Clare Balding, will urge people not to be frightened of getting cancer checks.
Each presenter have been affected by cancer - one host said recently she had had an operation for a tumour, while another presenter was treated for a thyroid condition in the past. Host Adam Hills has previously mentioned his parent, who had one form of cancer and then later leukaemia.
The show will appeal to the roughly nine million people in the UK who health organisations state are not current with NHS screening schemes, with an online checker to let people see if they are qualified for examinations for several common cancers.
In an bid to demystify health tests and demonstrate the importance of prompt detection there will be a direct feed from treatment centres at Addenbrooke's and Royal Papworth hospitals in Cambridge.
"My aim is to take the fear out of health checks and demonstrate the public that they are not alone in this," said one of the hosts.
At present in the UK, there are three NHS cancer screening programmes - for specific cancers - accessible for specific demographics.
A emerging lung cancer screening programme is also being phased in for individuals at potential risk of developing the condition, focusing on people in a specific age bracket, who are smokers or were former smokers.
Male patients may enquire about prostate cancer checks, but there is not a universal scheme in place.
The charity project, which has generated £113m for many years, is supporting 73 clinical trials encompassing many patients.
His Majesty, in a message for guests at a gathering for support groups in the spring, had referred to acknowledging the "overwhelming and at times alarming situation" for patients and their families.
But he stated his personal journey of living with cancer had shown him that "the darkest moments of sickness can be illuminated by the support of carers," as he commended those who supported those receiving treatment.
Official sources has not disclosed the specific type of cancer the King has, or the therapies he has undergone. The King's cancer was detected after he had undergone a prostate procedure.