SF3B1 and myelodysplastic syndrome: Nine (20.0%) patients in both the MDS with ring sideroblasts and single lineage dysplasia (MDS-RS-SLD) and MDS-RS and multilineage dysplasia (MDS-RS-MLD) subgroups, all with wild-type SF3B1, were distinguished from those with mutated SF3B1 (Table 1).