{{Rsnum 
|rsid = 4987945
|Gene = ATM
|Chromosome = 11
|Orientation=plus
|ReferenceAllele=C
|MissenseAllele=G
|geno1=(C;C)
|geno2=(C;G)
|geno3=(G;G)
|position=108251865
|Assembly=GRCh38
|GenomeBuild=38.1
|dbSNPBuild=141
|Status=Merged
|Merged=2227924
|Gene_s=ATM
}}{{ population diversity
| geno1=(C;C)
| geno2=(C;G)
| geno3=(G;G)
| CEU | 99.1 | 0.9 | 0.0
| HCB | 100.0 | 0.0 | 0.0
| JPT | 100.0 | 0.0 | 0.0
| YRI | 85.7 | 13.6 | 0.7
| ASW | 96.5 | 3.5 | 0.0
| CHB | 100.0 | 0.0 | 0.0
| CHD | 0.0 | 0.0 | 0.0
| GIH | 0.0 | 0.0 | 0.0
| LWK | 83.0 | 17.0 | 0.0
| MEX | 0.0 | 0.0 | 0.0
| MKK | 94.8 | 5.2 | 0.0
| TSI | 99.0 | 1.0 | 0.0
| HapMapRevision=28
}}This SNP, a variant in the [[ATM]] gene, is 1 of 25 SNPs reported to represent independently minor, but cumulatively significant, increased risk for [[breast cancer]]. {{PMID|17341484}}

For details of all 25 SNPs in this group, along with the two methods used to calculate overall risk estimates for [[breast cancer]], refer to the SNPedia [[breast cancer]] entry.

For this particular SNP, the risk (minor) allele is (G).

{{ on chip | Affy GenomeWide 6}}
{{ on chip | Affy500k}}
{{on chip | Affy GenomeWide 6}}
{{on chip | FTDNA2}}
{{on chip | HumanOmni1Quad}}