Correction to: Nature https://doi.org/10.1038/s41586-019-1130-6 Published online 17 April 2019.

In the version of this Letter initially published, the Acknowledgements section omitted the following note of support from Geoffrey M. Wahl: “Work in the laboratory of G.M.W. was supported, in part, by the Cancer Center Core Grant (CA014195), National Institutes of Health/National Cancer Institute (R35 CA197687), National Institutes of Health Cancer Training Grant (T32 CA009370), the Isacoff Research Foundation Gastrointestinal (ICOF) and the Freeberg Foundation.”.