My sister had mylodysplastic syndrome (MDS) as the result of chemotherapy to treat breast cancer (exactly like what happened to Robin Roberts on Good Morning America). It is a pre-leukemia condition that can be survivable through stem cell transplantation as we've seen the great result that Ms. Roberts had. My other sister and I hoped we would be a match for her, but we were both only 50% matches (and ironically 100% matches for each other). They did find an anonymous bone marrow donor for my sister. The transplant went fine, but she suffered constant problems with HVGD (Host Versus Graft Disease) and wasted away due to those problems. It was a very difficult process for all of us.