Rusolo et al. systemically examined the expression of GPxs in breast cancer cell lines and found that GPx5 and GPx7 were down-regulated in the human breast cancer MCF-7 and MDA-MB-231 cell lines and GPx6 was also down-regulated in MDA-MB-231cells compared with healthy breast MCF-10A cells [19]. This evidence concerns the gene GPX7 and breast carcinoma.