He became president of the Royal Marsden in May 2007 – a role held by his mother Diana for several years before her death.
William's late mother Diana was a huge supporter of the hospital; she auctioned off 79 dresses – at son's suggestion – helping raise funds for the Marsden weeks before her passing in 1997.
And a decade later, the hospital was one of the charities to benefit from Concert for Diana, a celebratory event staged by her boys.
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Prince William and the Duchess of Cambridge visit cancer patients - hellomagazine.com