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Familial breast cancer
C M Steel1, B B Cohen, D E Porter
1MRC Human Genetics Unit, Western General Hospital, Edinburgh, UK.
Seminars in Cancer Biology
|June 1, 1992
Summary
Genetic research identifies a breast cancer gene locus on chromosome 17q12-21, crucial for understanding familial breast cancer risk and developing targeted screening strategies.
Area of Science:
- Genetics
- Oncology
- Molecular Biology
Background:
- Familial breast cancer clustering suggests a genetic basis, with epidemiological studies supporting an autosomal dominant gene.
- Identifying specific breast cancer predisposition genes is challenging due to potential genetic heterogeneity and admixture of sporadic cases in large families.
Purpose of the Study:
- To identify specific genetic loci associated with familial breast and breast/ovarian cancer.
- To refine understanding of the genetic architecture of hereditary breast cancer.
Main Methods:
- Linkage mapping in familial breast and breast/ovarian cancer kindreds.
- Analysis of cytogenetic and Loss of Heterozygosity (LOH) data in sporadic breast cancers.
- Genetic analysis of the p53 gene (17p13).
Main Results:
- Identification of a breast cancer gene locus at 17q12-21, supported by high lod scores at low recombination fractions in Edinburgh families.
- A smaller proportion of familial breast cancer is linked to mutations in the p53 gene (17p13).
- Previous reports of linkage to chromosome 17q21 (probe CMM86) were not fully confirmed.
Conclusions:
- The majority of familial breast cancer cases studied are attributable to a gene mutation at 17q12-21.
- Genetic counseling for breast cancer families requires precise identification of mutations and their associated phenotypes.
- Further research and data collection are essential to define mutations, establish penetrance, and develop screening and prevention strategies for high-risk populations.