SMAD4 and breast cancer: Using a case-control design, we analyzed associations between BC risk and the following SNPs: rs832583 (MAP3K1), rs16865677 (SF3B1), rs3819122 (SMAD4), rs12456284 (SMAD4), rs75704921 (ARID2), rs2229032 (ATR), rs3735156 (KMT2C), rs2276738 (MAP3K13), rs2293206 (MAP3K13), rs4075943 (MAP3K13), rs13091808 (MAP3K13), rs178831 (NCOR1), and rs3759173 (TBX3).