More African-American donors needed for rare blood disorder

Good Morning America anchor Robin Roberts

The diagnosis of Good Morning America anchor Robin Roberts has brought attention to a rare blood disorder.

Roberts announced Monday on the ABC show that she would begin treatment for myelodysplastic syndrome the next day. She said her sister is virtually a perfect match for a bone marrow transplant, but a good match is hard to find, especially in the African-American community.

Only 7 percent of the 10 million people registered with them as bone marrow donors are African-American.

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