By sharing his story about being diagnosed with acute myeloid leukemia, Warren Shen inspired more than 8,000 people to join the National Marrow Donor Program. The 29-year-old posted a TikTok video to help him find his own donor, and the response was “incredible,” he told People. Of the new sign-ups, more than 5,000 are Asian American, a community “significantly underrepresented” in donor databases, the magazine said. To register, participants mail in a cheek swab.