Authors have only now noticed that in the Figure 3a, the immunohistochemical analysis of IL-4Rα on paraffin-embedded sections from breast is incorrect: IL-4 from breast was duplicated and used for the IL-4Rα staining. The correct Figure 3a has been included in the amendment to this paper.An amendment to this paper has been published and can be accessed via a link at the top of the paper.