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The Duke of Cambridge has launched a charity appeal which aims to raise £100 million in aid of the Royal Marsden Hospital.
In a specially made film William urged the public to help the Royal Marsden Cancer Charity reach its target over the next 10 years and fund the hospital's "amazing work".
The Royal Marsden is a world-leading cancer centre specialising in all areas of diagnosis, treatment, care and research into the disease.
The Duke has been its president since 2007 and in his message of support said: "I am extremely proud to be president of the Royal Marsden, an incredible hospital and a world-class cancer centre carrying out ground-breaking work influencing the treatment of cancer patients all over the UK."
William highlighted how he and wife Kate had visited, and opened, the Royal Marsden's cancer unit for children and young people at its hospital in Sutton, south London.