CYP2C19*2 polymorphism is associated with increased survival in breast cancer patients using tamoxifen.

Abstract:

AIMS:Variant alleles of the CYP2C19 gene were recently associated with survival in breast cancer patients on tamoxifen therapy. CYP2C19 is one of the enzymes involved in the metabolism of tamoxifen into active metabolites. We investigated the hypothesis that CYP2C19*2 and *3 variants, known for their lack of enzyme activity, are associated with an increased breast cancer mortality rate in patients using tamoxifen. MATERIALS & METHODS:In the prospective population based Rotterdam study, the association between CYP2C19*2 carriers and breast cancer mortality was studied among 80 incident users of tamoxifen. Survival was analyzed with life tables and Cox regression analysis, with drug exposure as a time-dependent variable. Adjustments were made for calendar time, average tamoxifen dose, age, the indication for tamoxifen, CYP2D6 genotype and concomitant use of CYP2C19 inhibitors or inducers. RESULTS:In patients on tamoxifen, CYP2C19*2 carriers were associated with a significantly longer breast cancer survival rate than patients with the wild-type (hazard ratio 0.26, 95%CI: 0.08-0.87). CONCLUSION:This study suggests that CYP2C19 genotype may possibly be a predictive factor for survival in breast cancer patients using tamoxifen.

journal_name

Pharmacogenomics

journal_title

Pharmacogenomics

authors

Ruiter R,Bijl MJ,van Schaik RH,Berns EM,Hofman A,Coebergh JW,van Noord C,Visser LE,Stricker BH

doi

10.2217/pgs.10.112

subject

Has Abstract

pub_date

2010-10-01 00:00:00

pages

1367-75

issue

10

eissn

1462-2416

issn

1744-8042

journal_volume

11

pub_type

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