Breast Cancer Research and Treatment

, Volume 95, Issue 1, pp 81–87

Incidence of BRCA1 and BRCA2 mutations in 54 Chilean families with breast/ovarian cancer, genotype–phenotype correlations

  • Marcela Gallardo
  • Antonia Silva
  • Lorena Rubio
  • Carolina Alvarez
  • Carolina Torrealba
  • Mauricio Salinas
  • Teresa  Tapia
  • Paola Faundez
  • Lorena Palma
  • María Eugenia Riccio
  • Hernando Paredes
  • Mario Rodriguez
  • Adolfo Cruz
  • Christine Rousseau
  • Mary Claire King
  • Mauricio Camus
  • Manuel Alvarez
  • Pilar Carvallo
Epidemiology

DOI: 10.1007/s10549-005-9047-1

Cite this article as:
Gallardo, M., Silva, A., Rubio, L. et al. Breast Cancer Res Treat (2006) 95: 81. doi:10.1007/s10549-005-9047-1

Summary

Our aim was to analyze the incidence of mutations in BRCA1 and BRCA2 genes in 54 families with breast/ovarian cancer. Families were selected from three Institutions following the standard criteria for hereditary breast/ovarian cancer. PCR amplification of all exons was performed, followed by SSCP, heteroduplex, PTT and sequencing analysis. We identified eight truncation mutations, three in the BRCA1 gene and five in the BRCA2 gene. Three of these mutations have not been reported previously by other groups: 308insA in one family, 3936 C>T in two families, for BRCA1, and 4970insTG in one family for BRCA2. In addition two families having Ashkenazi Jewish ancestors present the well known mutations 185delAG and 6174delT. Interestingly, 5 out of 11 families have mutations recurrent in Spanish families. Among the 54 families selected, seven have breast and ovary cancer cases, and only two presented a mutation in BRCA1 or BRCA2 genes. Other cancers as prostate and stomach are frequent among relatives carrying the mutation. Five cases of very early onset (<31 years old) breast cancer were detected. The frequencies of BRCA1 (0.074) and BRCA2 (0.13) mutations in our families is low but similar to the incidence found in other populations, like in Spain. Since is widely known that risk factors that modulate the development of breast cancer such as lifestyle risk factors, geographic location, country of origin and socioeconomic status, besides a familial history of breast cancer our findings suggest that the history of colonization and immigrations is very relevant when studying hereditary factors associated to breast cancer.

Keywords

BRCA1 BRCA2 differential expressivity of mutations ethnic factors genetic of breast cancer mutation incidence 

Copyright information

© Springer Science+Business Media, Inc. 2005

Authors and Affiliations

  • Marcela Gallardo
    • 1
  • Antonia Silva
    • 1
  • Lorena Rubio
    • 1
  • Carolina Alvarez
    • 1
  • Carolina Torrealba
    • 1
  • Mauricio Salinas
    • 1
  • Teresa  Tapia
    • 1
  • Paola Faundez
    • 1
  • Lorena Palma
    • 1
  • María Eugenia Riccio
    • 1
  • Hernando Paredes
    • 2
  • Mario Rodriguez
    • 3
  • Adolfo Cruz
    • 3
  • Christine Rousseau
    • 4
  • Mary Claire King
    • 4
  • Mauricio Camus
    • 5
  • Manuel Alvarez
    • 5
  • Pilar Carvallo
    • 1
  1. 1.Departamento de Biología Celular y Molecular Facultad de Ciencias Biológicas, Pontificia Universidad Católica de ChileSantiagoChile
  2. 2.Instituto Nacional del CáncerSantiagoChile
  3. 3.Hospital Barros LucoSantiagoChile
  4. 4.University of WashingtonSeattleUSA
  5. 5.Centro de Cáncer Facultad de Medicina, Pontificia Universidad Católica de ChileSantiagoChile
  6. 6.Departamento de Biología Celular y Molecular Facultad de Ciencias Biológicas, Pontificia Universidad Católica de ChileSantiagoChile

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