WHO 2016, IPSS-R classifications and overall survival of del(11q) MDS. (A) WHO 2016 classification of del(11q) MDS and MDS/MPN. (B) IPSS-R applied to the primary del(11q) MDS by risk category: very low = risk score ≤1.5; low = risk score >1.5-3; intermediate = risk score >3-4.5; high = risk score >4.5-6; very high = risk score >6. (C) Overall survival of del(11q) MDS compared with other MDS.