title: Polymorphic CAG and GGC repeat lengths in the androgen receptor gene and prostate cancer risk: analysis of a Brazilian population.
abstract: Variations in transcriptional activity of the androgen receptor (AR) are related to polymorphic CAG and GGC repeats in exon 1 of the AR gene. We investigated the association between CAG and GGC repeat length and the risk of prostate cancer in a case-control study from a Brazilian population. We evaluated 49 patients and 51 healthy controls. DNA was extracted from peripheral leukocytes and the AR gene was analyzed by fragment analysis (GeneMapper software, Applied Biosystems, Foster City, California, USA). CAG and GGC mean lengths were not different between cases and controls. The risk for prostate cancer was higher for CAG repeats < or = 21 (OR = 2.44 [95% CI 1.03-5.81]) as well as for total repeat lengths (CAG + GGC) < or = 37 (OR = 2.46 [95% CI 0.98-6.18]). GGC repeats (< or = 17 and > 17) were not associated with risk for prostate cancer (OR = 1.13 [95% CI 0.47-2.75]). In conclusion, fewer number of CAG repeats and total repeats (CAG + GGC) in the AR gene may be associated with increased risk for prostate cancer.
authors.affiliation: Division of Urology, Hospital de Clinicas de Porto Alegre and Urology Department, Medicine School, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.
authors.forename: Brasil
authors.initials: B
authors.lastname: Silva Neto
authors.forename: Walter J
authors.initials: WJ
authors.lastname: Koff
authors.forename: Vanderlei
authors.initials: V
authors.lastname: Biolchi
authors.forename: Cleber
authors.initials: C
authors.lastname: Brenner
authors.forename: Karlo D
authors.initials: KD
authors.lastname: Biolo
authors.forename: Poli Mara
authors.initials: PM
authors.lastname: Spritzer
authors.forename: Ilma S
authors.initials: IS
authors.lastname: Brum
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D001938:Brazil / Q000453:epidemiology; D016022:Case-Control Studies; D020022:Genetic Predisposition to Disease; D006801:Humans; D008297:Male; D008875:Middle Aged; D016133:Polymerase Chain Reaction; D011110:Polymorphism, Genetic; D011471:Prostatic Neoplasms / Q000235:genetics*; D011944:Receptors, Androgen / Q000235:genetics*; D018911:Trinucleotide Repeats / Q000235:genetics*
chemical_list: D011944:Receptors, Androgen