bone marrow transplant

“They say that breaking up is hard to do. Now I know, I know that it's true.” 

ABC News' Robin Roberts, 51, who announced she will undergo a bone marrow transplant this fall to fight a rare blood disorder, was fortunate that her older sister, Sally Ann, was the perfect match to donate marrow -- the only treatment for Roberts'  myelodysplastic syndrome (MDS), a type of…