Robin Roberts' Health Struggle: ''I'm Going to Beat This''

By Grady Smith
Updated June 15, 2012 at 04:00 AM EDT

Nearly five years after successfully battling breast cancer, Good Morning America coanchor Robin Roberts, 51, announced on June 11 that she’s been diagnosed with myelodysplastic syndrome (MDS), a rare blood and bone-marrow disease. Roberts began chemotherapy the same day, and she expects to undergo a bone-marrow transplant later this year, after which she’ll miss ”a chunk of time” on GMA. Roberts’ older sister Sally-Ann has volunteered to be her bone-marrow donor, and as Roberts tearfully explained on the air, she ”is a virtually perfect match for me.” Until then, Roberts will conduct business as usual — with her trademark pluck intact. ”My doctors tell me I’m going to beat this,” she wrote in a message on the GMA website following her announcement, ”and I know it’s true.”