King Charles and Sarah Ferguson have ‘bonded’ over cancer battles ‘with an exchange of letters’, claims the source

King Charles and the Duchess of York have ‘bonded’ over their cancer battles with ‘an exchange of letters’, a royal source has claimed.

Both Charles and Sarah Ferguson have been diagnosed with the disease this year and have reportedly supported each other with heartfelt letters.

Sarah, 64, who has previously battled breast cancer, was diagnosed with skin cancer, while the king has been found to have an unspecified form of the disease.

The 75-year-old monarch began treatment in a London hospital this week and is said to be ‘absolutely positive’ about her prognosis and ‘looks forward to returning to full public service as soon as possible’.

After the news of her skin cancer diagnosis, the mirror reports Charles wrote to the Duchess of York to offer his support and good wishes.

Fergie has since returned the gesture after news of the King’s fight became public.

A source said: ‘The King and Sarah are incredibly happy for each other and have now bonded over their respective cancer diagnoses with an exchange of letters.

‘Cancer is a vicious disease that affects so many individuals and their families and it is clear that extra support from loved ones and the wider cancer community can help immeasurably.’

This week, Sarah attended a cancer fundraiser and gave a speech in which she shared a moving tribute to King Charles and urged him to ‘keep fighting’.

At the Cancer Alliance of Help and Hope event in Florida, she said: ‘I want to thank you all for your kindness in supporting my family members who are going through a tough time and we wish everyone the best of luck, every family in the world, who have been diagnosed or are going through a difficult time, we wish them the best of luck.

“And of course, my brother-in-law, we wish you well, keep fighting.”

She added: ‘The Cancer Alliance is about hope and there is not enough hope in the world.

‘For anyone who suffers from low hope, for anyone who thinks they can’t do this, they can, it’s absolute nonsense.’

Both Charles and Sarah Ferguson have been diagnosed with the disease this year and have reportedly supported each other with heartfelt letters.

Sarah, 64, who has previously battled breast cancer, was diagnosed with skin cancer, while the king has been found to have an unspecified form of the disease

Sarah attended a Cancer Alliance event with Erbil Gunasti (left). The Duchess was the keynote speaker at the event

The first sign that something was wrong with King Charles’ health came on January 17, when Buckingham Palace made a surprise announcement that the king had ‘sought treatment’ for an enlarged prostate.

He chose to publicize his prostate treatment with the aim of encouraging more men to get prostate checks, the palace said at the time.

Shortly afterwards, palace officials also revealed that he chose to share his cancer diagnosis in the hope that it would ‘help public understanding of all those around the world affected by cancer’.

No further details about Charles’ condition have been shared, other than that he is ‘absolutely positive’ and looking forward to returning to his full public duties.

The first sign that something was wrong with King Charles’ health came on January 17, when Buckingham Palace made a surprise announcement that the king had ‘sought treatment’ for an enlarged prostate

He is at his Sandringham estate in Norfolk and is expected to return to London for weekly treatments

Family and friends were reportedly amazed by the king’s willingness to continue with ‘business as usual’.

He is at his Sandringham estate in Norfolk and is expected to return to London for weekly treatments.

Last month, NHS England saw a massive increase in people looking for information about melanoma, the fifth most common form of cancer, after Sarah, Duchess of York, was diagnosed with the disease.

The Duchess of York, 64, is said to be in ‘good spirits’ despite the ‘distressing’ news, which marked her second cancer diagnosis in six months after being treated for breast cancer last year.

There was one visit every 13 seconds to the NHS melanoma information website in the two days following the announcement.