Correction to: Nature Medicine https://doi.org/10.1038/s41591-019-0561-9, published online 9 September 2019.

In the version of this article initially published, ‘FPO-IRCCS’ was omitted in affiliation 5; the correct affiliation is Candiolo Cancer Institute, FPO-IRCCS, Candiolo, Italy. The error has been corrected in the HTML and PDF versions of the article.