In the July 2012 issue, the article entitled 'Cancer immunotherapy shows promise in multiple tumor types' (Nat. Med. 18, 993, 2012) incorrectly stated that the PD-1 ligand (PD-L1) is found only on tumor cells, when in fact it is expressed more widely. The error has been corrected in the HTML and PDF versions of the article.
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The online version of the original article can be found at 10.1038/nm0712-993
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Correction. Nat Med 18, 1310 (2012). https://doi.org/10.1038/nm0912-1310b
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DOI: https://doi.org/10.1038/nm0912-1310b
