NEW YORK (CBSNewYork) – A little girl dressed as a “Star Wars” stormtrooper rang the radio-therapy bell at a British hospital.

The bell marked the final radiation treatment for 4-year-old Audrina Hatton-Wright, who is battling a rare form of cancer.

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Audrina left the hospital in costume. Her parents are hoping to raise enough money to fly from the UK to New York to have her participate in a clinical trial at the Memorial Sloan Kettering Cancer Center.

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“Star Wars” star Mark Hamill tweeted, “Please give brave Audrina my love and best wishes for a complete recovery and a long and healthy life.”

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People interested in helping Audrina and following more of her story can find information on her website