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In July, 9-year-old Stephen Mondek became what Cedars-Sinai Medical Center believes is its youngest known stem cell donor.

His father, 48-year-old anesthesiologist Nick Mondek, was dying of acute myeloid leukemia, a cancer that affects blood-forming cells in the bone marrow, and needed a donation to rebuild his immune system.

The question came at dinner toward the end of June.

Anesthesiologist Nick Mondek, 48, was dying of acute myeloid leukemia, a cancer that affects blood-forming cells in the bone marrow. It was a serious topic to tackle with his then-9-year-old son, Stephen, as they ate bowls of pasta.

But Mondek needed a stem cell donor — and fast. So he asked his son to save

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