title: RASSF1A polymorphism A133S is associated with early onset breast cancer in BRCA1/2 mutation carriers.
abstract: The tumor suppressor gene RASSF1A regulates cell cycle progression, apoptosis, and microtubule stability and is inactivated by promoter methylation in approximately 50% of breast cancers. It has been shown previously that the polymorphism A133S in RASSF1A reduces its ability to regulate cell cycle progression and this polymorphism is associated with an increased risk of breast cancer. We analyzed the frequency of RASSF1A A133S in 190 Caucasian women without breast cancer and 653 patients with breast cancer including 138 BRCA1 and BRCA2 (BRCA1/2) mutation carriers, 395 non-BRCA1/2 mutations carriers, and 120 untested for BRCA1/2 mutations. Patients with breast cancer had a higher frequency of A133S than the controls [P = 0.017; odds ratios (OR), 1.71; 95% confidence intervals (95% CI), 1.10-2.66]. There is also a higher frequency of A133S in patients with higher familial breast cancer risk (P = 0.029; OR, 1.76; 95% CI, 1.06-2.92) and patients carrying BRCA1/2 mutations (P = 0.037, OR, 1.82; 95% CI, 1.04-3.18). Importantly, we found that the co-occurrence of a BRCA1 or BRCA2 mutation and A133S in RASSF1A was associated with earlier onset of breast cancer compared with those individuals with either a BRCA1/2 mutation or the A133S polymorphism alone (36.0 versus 42.0 years old, P = 0.002). Our data suggest that the presence of the RASSF1A A133S polymorphism is associated with breast cancer pathogenesis in general and modifies breast cancer age of onset in BRCA1/2 mutations carriers. Our results warrant a large-scale study to examine the effect of the A133S polymorphism in the development of breast and other types of cancers.
authors.affiliation: Hamon Center for Therapeutic Oncology Research, The University of Texas Southwestern Medical Center at Dallas, 6000 Harry Hines Boulevard, Dallas, TX 75390-8593, USA. boning.gao@utsouthwestern.edu
authors.forename: Boning
authors.initials: B
authors.lastname: Gao
authors.forename: Xian-Jin
authors.initials: XJ
authors.lastname: Xie
authors.forename: Chunxian
authors.initials: C
authors.lastname: Huang
authors.forename: David S
authors.initials: DS
authors.lastname: Shames
authors.forename: Tina T-L
authors.initials: TT
authors.lastname: Chen
authors.forename: Cheryl M
authors.initials: CM
authors.lastname: Lewis
authors.forename: Aihua
authors.initials: A
authors.lastname: Bian
authors.forename: Bifeng
authors.initials: B
authors.lastname: Zhang
authors.forename: Olufunmilayo I
authors.initials: OI
authors.lastname: Olopade
authors.forename: Judy E
authors.initials: JE
authors.lastname: Garber
authors.forename: David M
authors.initials: DM
authors.lastname: Euhus
authors.forename: Gail E
authors.initials: GE
authors.lastname: Tomlinson
authors.forename: John D
authors.initials: JD
authors.lastname: Minna
mesh_terms: D000293:Adolescent; D000328:Adult; D017668:Age of Onset; D000368:Aged; D000369:Aged, 80 and over; D051017:Apoptosis Regulatory Proteins; D019313:BRCA1 Protein / Q000235:genetics*; D024682:BRCA2 Protein / Q000235:genetics*; D001943:Breast Neoplasms / Q000453:epidemiology / Q000235:genetics*; D005260:Female; D005787:Gene Frequency; D006579:Heterozygote; D006801:Humans; D008875:Middle Aged; D009154:Mutation; D011110:Polymorphism, Genetic; D025521:Tumor Suppressor Proteins / Q000235:genetics*
chemical_list: D051017:Apoptosis Regulatory Proteins; C118024:BLID protein, human; D019313:BRCA1 Protein; C492913:BRCA1 protein, human; D024682:BRCA2 Protein; C551750:BRCA2 protein, human; C411762:RASSF1 protein, human; D025521:Tumor Suppressor Proteins