"A huge thank you to everybody who has supported The Royal Marsden Cancer Charity."
According to the charity's website, the journey aims to highlight holistic care alongside traditional clinical pathways.
The Princess of Wales detailed her personal connection to the cause in an accompanying open letter about the enterprise.
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"Cancer doesn't just affect the body. It changes how you think and feel and profoundly affects every aspect of life.
I know this personally, and that the journey through and beyond treatment requires more than medicine alone," wrote Kate, Princess of Wales.
The royal emphasized that individualized, comprehensive support is vital for patients navigating the emotional and physical hurdles of a serious medical diagnosis.
"Every individual is different, and ensuring there is a whole person approach to care enables those living through cancer to manage the deeply personal challenge of diagnosis.
Holistic therapies complement clinical pathways and support patients' ability to maintain their wellbeing, resilience and quality of life during an exceptionally difficult time," she added.
James Middleton also shared a photo embracing his sister, reflecting on a promise made during her previous hospitalization regarding the healing power of nature.
"Two years ago, I told you we'd climb this mountain together," stated James Middleton.
"We talked about climbing mountains while you were in hospital, and about the incredible healing power that nature can have for both the body and the mind.
So it was such an honour to join you for your Three Peaks Challenge for the Royal Marsden Cancer Charity."
He expressed deep admiration for her ongoing determination and resilience throughout her recovery journey.
"Seeing how far you've come is nothing short of inspiring.
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Your strength, resilience, and determination, all while being the most amazing mother, wife, daughter, and sister, inspire me and so many others every single day," he added.
