Five years ago, she beat breast cancer, but today Good Morning America coanchor Robin Roberts announced that she has been diagnosed with myelodysplastic syndrome, or MDS.

“I’ve always been a fighter, and with all of your prayers and support, a winner,” Roberts writes in a letter to her audience on the news show’s website. “Sometimes the treatment for cancer can cause other serious medical problems . . . [MDS is] a disease of the blood and bone marrow and was once known as preleukemia.”

Roberts writes that her doctors say she will be cured of the disease and that she will continue working on GMA.

“Today, I will start what is known as pre-treatment—chemotherapy in advance of a bone marrow transplant later this year,” she writes. “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.”

Roberts writes that prayers and well wishes helped her through her breast-cancer recovery.

“In facing this new challenge, I ask humbly for more of your prayers and love—as I will keep you in my mine and update you regularly on my condition.”

As if she had to ask.

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