{{Rsnum
|rsid=9332131
|Gene=CYP2C9
|Chromosome=10
|position=96709039
|Orientation=plus
|ReferenceAllele=A
|Summary=Warfarin (Coumadin®)
|geno1=(-;-)
|geno2=(-;A)
|geno3=(A;A)
|Assembly=GRCh37
|GenomeBuild=37.1
|dbSNPBuild=131
}}
{{CPMC SNP
|link=https://cpmc.coriell.org/Sections/Results/Warfarin.aspx?PgId=222
}}[[rs9332131]], also known as 818delA, 10601delA or 273Frame shift, is a SNP in the [[CYP2C9]] gene.

The [[rs9332131]](-) allele defines the CYP2C9*6 variant, which is inactive.

{{PMID Auto
|PMID=20214591
|Title=Pharmacogenomics in aspirin intolerance
}}

{{PharmGKB
|RSID=rs9332131
|Name_s=CYP2C9*6;CYP2C9:null allele
|Gene_s=CYP2C9
|Feature=
|Evidence=PubMed ID:20072124
|Annotation=Phenotype: In African Americans patients, weekly warfarin dose requirements were lower in those with the CYP2C9*8 allele (34 (30-47) mg; P = 0.023) and the CYP2C9 *2, *3, *5, *6, or *11 allele (33(28-40 mg); P < 0.001) as compared with those with the CYP2C9*1/*1 genotype (43 (35-56) mg). Adding the *5,*6,*8 and *11 alleles to a model containing the *2 and *3 alleles plus the VKORC1 -1639 G>A allele (along with clinical variables) explained 36% vs. 30% of the variability in dose requirements. Study size: 226 . Study population/ethnicity: African-American . Type of association: PD;GN;CO
|Drugs=warfarin
|Drug Classes=
|Diseases=Atrial Fibrillation; Pulmonary Embolism; Stroke; Venous Thrombosis
|Curation Level=Curated
|PharmGKB Accession ID=PA165260362
}}

{{PMID Auto
|PMID=18466099
|Title=Influence of CYP2C9 and VKORC1 on warfarin dose, anticoagulation attainment and maintenance among European-Americans and African-Americans.
|OA=1
}}

{{PMID Auto
|PMID=18752379
|Title=Warfarin pharmacogenetics.
|OA=1
}}

{{PMID Auto
|PMID=19955245
|Title=Warfarin sensitivity genotyping: a review of the literature and summary of patient experience.
|OA=1
}}

{{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}}