title: Meta- and pooled analyses of the cytochrome P-450 1B1 Val432Leu polymorphism and breast cancer: a HuGE-GSEC review.
abstract: The association between the cytochrome P-450 1B1 (CYP1B1) Val432Leu polymorphism and breast cancer was assessed through a meta-analysis of all published case-control studies and a pooled analysis of both published and unpublished case-control studies from the Genetic Susceptibility to Environmental Carcinogens (GSEC) database ( www.upci.upmc.edu/research/ccps/ccontrol/g_intro.html ). GSEC is a collaborative project that gathers information on studies of metabolic gene polymorphisms and cancer. Thirteen articles were included in the meta-analysis (14,331 subjects; 7,514 cases, 6,817 controls); nine data sets were included in the pooled analysis (6,842 subjects; 3,391 cases, 3,451 controls). A summary meta- or pooled estimate of the association between the CYP1B1 Val432Leu polymorphism and breast cancer could not be calculated because of statistically significant heterogeneity in the point estimates among studies. No association between the CYP1B1 Val432Leu polymorphism and breast cancer was observed in Asians (for Val/Val and Val/Leu combined, odds ratio (OR) = 1.0, 95% confidence interval (CI): 0.8, 1.2). An inverse association was observed in populations of mixed/African origin (OR = 0.8, 95% CI: 0.7, 0.9). The pooled analysis suggested a possible association in Caucasians (for Val/Val and Val/Leu combined, OR = 1.5, 95% CI: 1.1, 2.1), with effect modification across age categories. The observed effect of age on the association in Caucasians indicates that further studies are needed on the role of CYP1B1 Val432Leu in estrogen metabolism according to age, ethnicity, and menopausal status.
authors.affiliation: Scientific Direction, Ospedale Maggiore, Milan, Italy.
authors.forename: Valentina
authors.initials: V
authors.lastname: Paracchini
authors.forename: Sara
authors.initials: S
authors.lastname: Raimondi
authors.forename: Inger T
authors.initials: IT
authors.lastname: Gram
authors.forename: Daehee
authors.initials: D
authors.lastname: Kang
authors.forename: Neslihan A
authors.initials: NA
authors.lastname: Kocabas
authors.forename: Vessela N
authors.initials: VN
authors.lastname: Kristensen
authors.forename: Donghui
authors.initials: D
authors.lastname: Li
authors.forename: Fritz F
authors.initials: FF
authors.lastname: Parl
authors.forename: Tove
authors.initials: T
authors.lastname: Rylander-Rudqvist
authors.forename: Pavel
authors.initials: P
authors.lastname: Soucek
authors.forename: Wei
authors.initials: W
authors.lastname: Zheng
authors.forename: Sara
authors.initials: S
authors.lastname: Wedren
authors.forename: Emanuela
authors.initials: E
authors.lastname: Taioli
mesh_terms: D001189:Aryl Hydrocarbon Hydroxylases / Q000235:genetics*; D014408:Biomarkers, Tumor / Q000235:genetics*; D001943:Breast Neoplasms / Q000235:genetics*; D065633:Cytochrome P-450 CYP1B1; D005260:Female; D006801:Humans; D011110:Polymorphism, Genetic; D012334:RNA, Neoplasm / Q000235:genetics*
chemical_list: D014408:Biomarkers, Tumor; D012334:RNA, Neoplasm; D001189:Aryl Hydrocarbon Hydroxylases; C585496:CYP1B1 protein, human; D065633:Cytochrome P-450 CYP1B1