Similarly, breast cancer-derived exosomes can induce increases in mRNAs of pro-inflammatory cytokines such as interleukin (IL)-6, tumor necrosis factor (TNF), granulocyte colony stimulating factor (G-CSF) and chemokine CCL2, through a Toll-like receptor (TLR)-2 stimulation and NF-κB in macrophages (188). This evidence concerns the gene TNF and breast cancer.