The cure that helped Good Morning America co-host Robin Roberts beat breast cancer may have caused the new disease shes battling, experts said Monday.

And before Roberts undergoes a bone marrow transplant to combat MDS, or myelodysplastic syndrome, she will need to subject her already weakend body to even more chemotherapy.

I know it seems counterintuitive, said Dr. Azra Raza, who heads the MDS Center at New York-Presbyterian Hospital/Columbia. But this is the only way we know how to get rid of these damaged cells before we can start treatment.

MDS is a disease of the blood and bone marrow that if left untreated can lead to leukemia and death.

It is a relatively rare condition, said Raza. The are 15,000 cases diagnosed annually every year in the U.S.

Patients who have been exposed to benzene or who have undergone chemotherapy or radiation treatments for cancer are the most susceptible to MDS, said Azra.

Sometimes stem cells are damaged during radiation or chemotherapy, Raza said. MDS is a bad disease to have.

There are different degrees of severity, added Robert Bona, Professor of Medical Sciences at Quinnipiac University. The ones that are most severe are treated with bone marrow transplants, if theyre young enough and a donor can be found.

Bone marrow donors are scarce, especially for African-American women.

Luckily for Roberts, her sister Sally-Ann Roberts, an anchor at a New Orleans TV station, is a match. And the 51-year-old newscasters age and otherwise good physical condition greatly improve her chances of licking this disease, the experts said.

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Robin Roberts’ breast cancer cure may have caused new illness

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