Nature Reviews Drug Discovery 11, 25–36 (2012) | doi:10.1038/nrd3404

In Table 1, the information listed in the 'Substrates' column for 'Etoposide and teniposide' and 'Mitoxantrone' is incorrect; 'TOP1–DNA complex' should be 'TOP2–DNA complex' in both instances. This has been corrected in the online version of the article.