Robin Roberts Saved By Sister In Bone Marrow Battle!

Good Morning America host, Robin Roberts, is speaking out about her battle with myelodysplastic syndrome, or MDS. Also known as preleukemia, MDS is a type of bone marrow disease, according to the American Cancer Society.

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Roberts, who will undergo chemotherapy before getting a bone marrow transplant, said she felt grateful to her sister, who just happens to be her donor.

"Bone marrow donors are scarce and particularly for African-American women...I am very fortunate to have a sister who is an excellent match, and this greatly improves my chances for a cure," Robin wrote on Monday.

According to CNN.com, more than 10,000 people in the U.S. are diagnosed with blood-related disorders yearly. Only 66% of African-Americans and other minorities, however, are able to find a match on the national registry, versus 93% for Caucasians, reports the site.

Just five years ago, the GMA host beat breast cancer. What do you think about Ms. Roberts' diagnosis? Send her your well wishes, below...