Good Morning America cohost Robin Roberts disclosed on the show this morning (Monday) that she has been diagnosed with a rare form of leukemia called myelodysplastic syndrome (MDS). "I received my MDS diagnosis on the very day that Good Morning America finally beat the Today show for the first time in 16 years. Talk about your highs and lows!" she said. "Then a few weeks ago, during a rather unpleasant procedure to extract bone marrow for testing, I received word that I would interview President Obama the next day. The combination of landing the biggest interview of my career and having a drill in my back reminds me that God only gives us what we can handle and that it helps to have a good sense of humor when we run smack into the absurdity of life." ABC's Dr. Richard Besser explained that the disease No Doubt occurred as a result of Roberts's treatment for breast cancer five years ago. The 51-year-old former sportscaster told viewers that her sister is an excellent match for the transplant "and this greatly improves my chances for a cure." She said that she will remain on the show until she begins treatment later this year.