U2AF1 and myelodysplastic syndrome: Mutations in U2AF1 have been identified not only in patients with MDS (Graubert et al. 2011; Yoshida et al. 2011), but also in patients with CMML, secondary acute AML (Graubert et al. 2011; Yoshida et al. 2011; Papaemmanuil et al. 2013), hairy cell leukemia (Waterfall et al. 2014), pancreatic ductal adenocarcinomas (Bailey et al. 2016), and non-small cell lung adenocarcinomas (Imielinski et al. 2012).