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The Duke and Duchess of Cambridge Visit The Royal Marsden Hospital

LONDON, UNITED KINGDOM - SEPTEMBER 29: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge meet patient Digby Davidson, 14,, during a visit to open the new Oak Centre for Children and Young People at The Royal Marsden Hospital on September 29, 2011 in London, England. (Photo by Kirsty Wigglesworth - WPA Pool /Getty Images)

Duke, Duchess of Cambridge open cancer center

Prince William and wife Catherine opened the new specialist children's cancer treatment ward, the Oak Centre for children and young people, at the Royal Mardsen hospital London. (Sept. 29/AP)