CYP2E1 and breast cancer: The decreasing levels of CYP2E1 in advanced stages of breast cancer cells [19] together with our observations indicating that high cellular levels of CYP2E1 induce autophagy in MDA-MB-231 cells and UPR in MCF7 cells, both of which are regulators of the tumour microenvironment [61], led us to investigate its role in regulating migration of breast cancer cells.