Retraction to: Oncogene (2014); doi:10.1038/onc.2014.158; published online 9 June 2014

The authors wish to retract this article due to concerns raised regarding some of the data presented in Figures 2, 4, 5, 6 and Supplementary Figures 6 and 7.

According to the data presented in Figures 1, 3 and 7, the major conclusion drawn from this article is still valid: IL-6 secreted by CAFs is causal factor for tamoxifen resistance in luminal breast cancer.

The authors are deeply regretful and apologize to the readers.