ERN1 and breast cancer: The conditional logistic regression adjusted for smoking habits confirmed the association between the rs196929 in ERN1 and skin (OR = 2.07, 95% C.I. 1.27–3.37, p = 0.003) and breast cancer (OR = 1.83, 95% C.I. 1.13–2.99, p = 0.013) (Table 3).