By Craig Johnson, HLNtv

Since “Good Morning America” anchor Robin Roberts disclosed this week that she is battling myelodysplastic syndrome, a rare blood disorder, the number of people signing up as potential bone marrow donors on Be the Match has soared more than 1,800 percent.

The Minneapolis-based Be the Match Registry, a nonprofit operated by the National Marrow Donor Program, told HLN on June 12 that the initiative usually sees about 200-300 people register daily online. On Monday, after Roberts’ tearful disclosure, more than 3,650 people signed up in a matter of hours.

In a letter published on the ABC blog, Roberts, who beat breast cancer five years ago, encouraged readers to sign up with a donor registry "like bethematch.org." 

"My doctors tell me I'm going to beat this — and I know it's true," Roberts said Monday. By bringing attention to the disorder, she has raised the possibility that others will beat it too.

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