A total of £22,000 has so far been raised by this year's OX5 run - but organisers believe there is more to come.
Only about a quarter of the 800 runners who took part in the 10km run around Blenheim Palace have so far returned sponsorship money for the Oxford Children's Hospital.
Graham Brogden, the head of community fundraising at the hospital, said: "We are very grateful for everybody's support and participation in the run.
advertisement "We would encourage everyone to get sponsorship money to us and no doubt we will see a much greater final total."
Last year's event raised £55,000 for the now open hospital and it is hoped the final figure fo 2007 will be even higher.
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