IL12A and breast cancer: The IL12A gene SNP rs2243123 T allele was associated with increased BC risk under the dominant genetic model for the crude (OR 1.35, 95% CI: 1.04–1.75, P = 0.02) and for the age and educational level adjusted models (OR 1.34, 95% CI: 1.02–1.77, P = 0.04).