When taking the most common haplotype (G‐C‐G‐G) as the reference group, haplotypes A‐C‐G‐G and A‐C‐A‐A in ATM gene were significantly associated with 1.98‐fold and 6.04‐fold increased risk of breast cancer (95% CI: 1.36‐2.90 and 1.65‐22.08, respectively). This evidence concerns the gene ATM and breast carcinoma.