To investigate the mechanism by which FOXF2 drives breast cancer bone metastasis, we screened genes that were coexpressed with FOXF2 based on our gene expression profiling data set of 49 primary breast cancer tissues9 and the Gene expression-based Outcome for Breast cancer Online (GOBO, http://co.bmc.lu.se/gobo/) tool10. This evidence concerns the gene FOXF2 and breast cancer.