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When David Stan was diagnosed with acute myeloid leukemia in the summer of 2023, his parents, Emil and Maria, were stunned. Cancer doesn’t run in either of their families. And until then, David had been a perfectly healthy 13-year-old. 

“In my line of work, I see some pretty awful things happening to children,” says Emil, a peace officer in southern California. “That can really mess with your head. But when it’s your kid,...