Robin Roberts Celebrates "Her Fourth Birthday"

Robin Roberts attending the ESPY AwardsJust over four years ago, Robin Roberts underwent a bone marrow transplant…and became an inspiration to millions of people.

READ: Robin Roberts: “I Choose To Be Fearless”

“I learned when I was first diagnosed with MDS that many in the transplant community consider the anniversary of their bone marrow transplant to be their new birthday,” Robin said.

Robin, 52, underwent the  transplant on Sept. 20, 2012, when she was injected with a syringe carrying cells donated by her sister Sally-Ann, according to Dr. Gail Roboz, an oncologist at New York-Presbyterian Hospital/Weill Cornell Medical Center.

READ: Robin Roberts Diagnosed With MDS

Roberts revealed that same year in June that she had been diagnosed with myelodyplastic syndrome (MDS), a bone marrow disorder triggered by treatment for breast cancer five years ago.