The new case of myelodysplastic syndrome (MDS) that overshadowed Bluebird Bio Inc.’s earnings and resulted in a clinical hold by the FDA will be addressed similarly to an earlier hitch in the sickle cell disease program, said Andrew Obenshain, the company’s head of severe genetic diseases. “Essentially, we will try and do the same thing,” and exonerate the lentiviral vector, he said during a conference call with investors. “At this point, we don't have tumor cells or leukemia to analyze,” he noted.