Nat. Genet. 47, 1326–1333 (2015); published online 12 October 2015; corrected after print 7 December 2015

In the version of this article initially published, two patients were stated on page 5 to have been excluded owing to insufficient follow-up data. These patients were included in the final analysis, but two additional patients were excluded owing to the presence of Noonan syndrome. On page 6, monosomy 7 was incorrectly listed as a significant factor in event-free and overall survival, but this factor was no longer significant after removing the patients with Noonan syndrome. The Online Methods incorrectly referred to “Data from patient AAML0122” instead of data from patients enrolled on AAML0122. The errors have been corrected in the HTML and PDF versions of the article.