Meet Harrison Marcus. He's a third grader at Parish Episcopal School in Dallas who was diagnosed with leukemia in October 2019.
He went from being a happy, hockey-playing third grader, to a little boy now fighting for his life.
On Saturday, around 1,100 people stopped by Parish Episcopal School for a bone marrow registration drive.
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"You could potentially save someone's life," his godmother Aimee Madden said.
The family has already gone through the National Marrow Donor Program, but there hasn't been a match yet.
"It's very important. Only 2% of Americans have been registered -- have been swabbed. There are 14,000 people in the U.S. looking for matching donors," said Amy Roseman, a donor recruiter who was at the event.
She said people who swabbed Saturday were added to a national database to help Marcus and other people with blood disorders find a match.