Mikaela Shumway, 4, loves to sing and dance and just started Pre-K 4.

But two years ago, she was hooked up to machines at Children’s National Hospital after tests confirmed she had leukemia.

"It was just like a whirlwind. You know, your mind always goes to the worst place, you know?" Mikaela's father Jon Shumway said.

At 2 years old, Mikaela began a grueling treatment plan including two rounds of chemotherapy followed by a bone marrow transplant from her 9-year-old brother, giving her a second chance at life.

It was a success. But the threat wasn’t over.

"The tough thing is, is if they relapse after that bone marrow transplant, outcomes are terrible. Their probability of having success with treatment is less than 30%." said Dr. Keri Toner, an oncologist at Children's National. "And if

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