Nature 539, 437–442 (2016); doi:10.1038/nature19834

In this Letter, the Gene Expression Omnibus (GEO) accession number for the RNA sequencing data (for in vivo tumour and tumour-associated macrophage samples) was incorrectly listed in the ‘Data availability’ section as GSE84318; the correct GEO accession number is GSE84535. This has been corrected online.