Interestingly, we observed increased expression levels of the TNFRSF1B gene in those women with increased concentrations of o,p’-DDT, p,p’-DDT, p,p’-DDE, and PCB-138, which is supported by previous evidence that also reported the up-regulation of the IL6R, TNF, and CXCL8 genes after exposure to DDT in breast cancer cells [80,91]. This evidence concerns the gene IL6R and breast cancer.