Kensington Palace confirmed the completed challenge on a Sunday in late June, describing it as a first for a working member of the royal family. A Deeply Personal MotivationThe princess dedicated the challenge to The Royal Marsden Cancer Charity, which supports the London hospital where she received treatment after announcing her cancer diagnosis in March 2024. Catherine has spoken previously about wanting to raise awareness for what she has termed "holistic care," an approach to cancer treatment that addresses a patient's mental, social and spiritual wellbeing alongside standard medical treatment. The Royal Marsden, based in Chelsea in west London, is a specialist cancer treatment center that has treated members of the royal family for decades. Alongside her statement, Catherine shared a fundraising link inviting members of the public to donate directly to The Royal Marsden Cancer Charity, extending the reach of the challenge beyond her own participation.