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Gene-expression profiles in hereditary breast cancer.

I Hedenfalk1, D Duggan, Y Chen

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Gene expression profiles differ between hereditary breast cancers caused by BRCA1 and BRCA2 mutations. This finding suggests that a patient's specific gene mutation influences their cancer's molecular characteristics.

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Area of Science:

  • Oncology
  • Genetics
  • Molecular Biology

Background:

  • Hereditary breast cancer is often linked to BRCA1 or BRCA2 gene mutations.
  • Histopathological features of these cancers can correlate with the specific gene mutation.
  • Distinct gene expression profiles may exist between BRCA1 and BRCA2 mutated tumors.

Purpose of the Study:

  • To investigate if gene expression profiles can differentiate between BRCA1 and BRCA2 mutated breast cancers.
  • To identify specific genes associated with BRCA1 and BRCA2 mutations in breast tumors.

Main Methods:

  • Compared gene expression profiles from tumors of BRCA1 mutation carriers, BRCA2 mutation carriers, and sporadic breast cancer patients using microarrays.
  • Analyzed 6512 complementary DNA clones representing 5361 genes.
  • Employed statistical analyses to identify distinguishing gene sets between BRCA1 and BRCA2 genotypes.

Main Results:

  • Gene expression profiles significantly differed among tumors with BRCA1 mutations, BRCA2 mutations, and sporadic tumors.
  • Identified 176 differentially expressed genes between BRCA1 and BRCA2 mutated tumors.
  • Observed functional differences between breast tumors associated with BRCA1 and BRCA2 mutations.

Conclusions:

  • Breast cancers with BRCA1 and BRCA2 mutations express distinct sets of genes.
  • A hereditary mutation significantly influences the gene expression profile of breast cancer.