{{Rsnum
|rsid=3731239
|Gene=CDKN2A
|Chromosome=9
|position=21974219
|Orientation=minus
|GMAF=0.1988
|Assembly=GRCh38
|GenomeBuild=38.1
|dbSNPBuild=141
|geno1=(C;C)
|geno2=(C;T)
|geno3=(T;T)
|Gene_s=CDKN2A
}}{{ population diversity
| geno1=(C;C)
| geno2=(C;T)
| geno3=(T;T)
| CEU | 15.9 | 50.4 | 33.6
| HCB | 1.5 | 16.2 | 82.4
| JPT | 1.8 | 21.2 | 77.0
| YRI | 0.0 | 0.0 | 100.0
| ASW | 0.0 | 5.3 | 94.7
| CHB | 1.5 | 16.2 | 82.4
| CHD | 1.9 | 25.2 | 72.9
| GIH | 10.9 | 45.5 | 43.6
| LWK | 0.0 | 0.9 | 99.1
| MEX | 3.4 | 15.5 | 81.0
| MKK | 0.0 | 7.7 | 92.3
| TSI | 6.9 | 51.0 | 42.2
| HapMapRevision=28
}}[[rs3731239]] shows a slight protective association against [[breast cancer]] in a British study involving ~2300 patients. The odds ratio for the (C;C) vs (T;T) homozygotes is 0.90 (CI: 0.79-1.03, p=0.013).{{PMID|18174243|OA=1
}}

{{PMID|19258477|OA=1
}} [[ovarian cancer]] [[rs3731239]] [[rs602652]] [[rs3212879]] [[rs649392]] [[rs3212891]] [[rs2069391]], [[rs2069414]] [[rs17528736]] [[rs3218036]]

{{PMID Auto
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|OA=1
}}

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|Title=Common genetic variation in candidate genes and susceptibility to subtypes of breast cancer.
|OA=1
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{{PMID Auto
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|Title=Chromosome 9p21 SNPs Associated with Multiple Disease Phenotypes Correlate with ANRIL Expression.
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{{PMID Auto
|PMID=23361049
|Title=Common genetic variants in the 9p21 region and their associations with multiple tumours
|OA=1
}}

{{PMID Auto
|PMID=25239644
|Title=Genetic polymorphisms in the 9p21 region associated with risk of multiple cancers
}}
{{on chip | 23andMe v1}}
{{on chip | 23andMe v2}}
{{on chip | 23andMe v3}}
{{on chip | 23andMe v4}}
{{on chip | FTDNA2}}
{{on chip | FTDNA}}
{{on chip | HumanOmni1Quad}}
{{on chip | Illumina Human 1M}}