title: Cyp17 promoter variant associated with prostate cancer aggressiveness in African Americans.
abstract: Androgens play an important role in the etiology of prostate cancer. The CYP17 gene encodes the cytochrome P450c17alpha enzyme, which is the rate-limiting enzyme in androgen biosynthesis. A T to C polymorphism in the 5' promoter region has recently been associated with prostate cancer. However, contradictory data exists concerning the risk allele. To investigate further the involvement of the CYP17 variant with prostate cancer, we typed the polymorphism in three different populations and evaluated its association with prostate cancer and clinical presentation in African Americans. We genotyped the CYP17 polymorphism in Nigerian (n = 56), European-American (n = 74), and African-American (n = 111) healthy male volunteers, along with African-American men affected with prostate cancer (n = 71), using pyrosequencing. Genotype and allele frequencies did not differ significantly across the different control populations. African-American men with the CC CYP17 genotype had an increased risk of prostate cancer (odds ratio, 2.8; 95% confidence interval, 1.0-7.4) compared with those with the TT genotype. A similar trend was observed between the homozygous variant genotype in African-American prostate cancer patients and clinical presentation. The CC genotype was significantly associated with higher grade and stage of prostate cancer (odds ratio, 7.1; 95% confidence interval, 1.4-36.1). The risk did not differ significantly by family history or age. Our results suggest that the C allele of the CYP17 polymorphism is significantly associated with increased prostate cancer risk and clinically advanced disease in African Americans.
authors.affiliation: National Human Genome Center at Howard University, Washington, DC 20059, USA. rkittles@howard.edu
authors.forename: R A
authors.initials: RA
authors.lastname: Kittles
authors.forename: R K
authors.initials: RK
authors.lastname: Panguluri
authors.forename: W
authors.initials: W
authors.lastname: Chen
authors.forename: A
authors.initials: A
authors.lastname: Massac
authors.forename: C
authors.initials: C
authors.lastname: Ahaghotu
authors.forename: A
authors.initials: A
authors.lastname: Jackson
authors.forename: F
authors.initials: F
authors.lastname: Ukoli
authors.forename: L
authors.initials: L
authors.lastname: Adams-Campbell
authors.forename: W
authors.initials: W
authors.lastname: Isaacs
authors.forename: G M
authors.initials: GM
authors.lastname: Dunston
mesh_terms: D000328:Adult; D000368:Aged; D044383:Black People / Q000235:genetics*; D017931:DNA Primers; D020022:Genetic Predisposition to Disease / Q000235:genetics; D014644:Genetic Variation / Q000235:genetics; D006801:Humans; D008297:Male; D008875:Middle Aged; D009367:Neoplasm Staging; D016133:Polymerase Chain Reaction; D011110:Polymorphism, Genetic; D011471:Prostatic Neoplasms / Q000235:genetics* / Q000473:pathology; D013254:Steroid 17-alpha-Hydroxylase / Q000235:genetics*; D001741:Black or African American
chemical_list: D017931:DNA Primers; D013254:Steroid 17-alpha-Hydroxylase