Nature 497, 67–73 (2013); doi:10.1038/nature12113

In the ‘Results’ section of this Article, the range in the sentence “The median follow-up of the cohort was 32 months (range, 1–19 months); 21% of the patients have recurred, and 11% have died.” should have been 1–195 months. This error has been corrected in the HTML and PDF versions of the paper.