BUFFALO, N.Y. (WKBW) — You might remember 6-year-old Brynlee Ailinger from just a few months ago, when I shared the story of her sharing temporary tattoos to spread smiles at Oishei Children's Hospital.

“I do that to make other kids happy and have a good time,” Brynlee told me in May.

WATCH: Cancer warrior uses temporary tattoos to spread smiles 'To make other kids happy': Cancer warrior uses temporary tattoos to spread smiles

Behind that joyful spirit is a story of resilience, fear, and groundbreaking medical science.

When Brynlee was just four years old, she was diagnosed with a rare and aggressive form of leukemia, precursor B-cell acute lymphoblastic leukemia, complicated by a high-risk mutation called TCF3-HLH. Her condition resisted traditional treatments.

“Not knowing wha

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