About 1,400 children in the UK are diagnosed with cancer each year
Young cancer patients met animals and celebrities at a London Zoo party thrown by a research charity.
Cancer Research UK honoured 26 young patients and their families at the Little Stars party.
They also met X-Factor finalists Same Difference and TV presenters Angelica Bell and Michael Underwood.
Sam Sharp, seven, from Mildenhall, Suffolk, was praised for allowing footage of his chemotherapy to be used to educate other young patients.
Sam was diagnosed with leukaemia at age three and has had three bouts of pneumonia and shingles in the last four years.
His mother Sarah said: "We did nearly lose him. It was touch and go.
"But all the way through this treatment he's been our little hero - smiling, never complaining and never moaning that he's got to have all this done to him."
The charity's annual event also highlighted the fact that about 1,400 children in the UK are diagnosed with cancer each year.