SF3B1 mutations were identified in 231 of 734 (31%) MDS patients and were mainly found in MDS-RS (171/200; 86%; MDS-RS-SLD: 43/51, 84%; MDS-RS-MLD: 128/149; 86%) resulting in 74% (171/231) of all SF3B1mut cases (Table 1; Fig. 1A–C). The gene discussed is SF3B1; the disease is myelodysplastic syndrome.