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Robin Roberts has been diagnosed with a rare blood disorder and will undergo a bone marrow transplant later this year, the “Good Morning America” co-anchor told viewers on Monday. Five years ago, Roberts beat breast cancer. “Sometimes treatment for cancer can lead to other serious medical issues,” she said Monday. “And that’s what I’m facing right now.” Roberts’s illness, known as myelodysplastic syndrome (MDS), is a rare blood disorder that affects the bone marrow. “The reason I’m sharing this with everybody now is because later today I begin what’s known as pre-treatment,” Roberts said, while surrounded on a couch by her co-anchor George Stephanopoulos and other “GMA” correspondents. “I didn’t want you to be concerned if you saw a bandage tomorrow.” In a note to viewers, she wrote that that her pre-treatment is chemotherapy in advance of a bone marrow transplant. Adding that the transplant will be sometime this year in the late summer or fall, Roberts told viewers that she already has a bone marrow donor that’s a near-perfect match. “My big sister is going to be my donor,” Roberts said, as the camera showed her sister, Sally-Ann Roberts, in studio. As her “GMA” colleagues around her offered words of support, Stephanopoulos noted that Roberts has known about the diagnosis for weeks, but that she showed up to work every day — and no one would have known anything was wrong. In fact, Roberts wrote in her note on ABC News‘s Web site, she learned about her MDS diagnosis “on …