The CYP1A1 T3801C polymorphism was associated with BC risk in overall population (CC vs. TT: OR = 1.34, 95% CI = 1.11–1.62; CC vs. TT + TC: OR = 1.27, 95% CI = 1.08–1.50; TC + CC vs. TT: OR = 1.11, 95% CI = 1.02–1.22). Here, CYP1A1 is linked to breast cancer.