A worldwide search is on for donors of an extremely rare blood type needed to help a South Florida toddler undergoing cancer treatment.

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A new treatment with the Zika virus might be able to target tumor cells in one of the deadliest childhood cancers. 

Joshua C. Cruey / Orlando Sentinel

Thirteen-year-old Talia Castellano, who stared down cancer and refused to blink for six years, died Tuesday of neuroblastoma, the Orlando Sentinel reports. As a preteen, bald from chemotherapy, the Orlando-area girl developed YouTube videos showing how to put on makeup. She became a nationwide inspiration for young cancer patients and others and was dubbed an “honorary CoverGirl” by Ellen Degeneres.