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dc.contributor.authorSmith, A
dc.contributor.authorMoran, Anthony
dc.contributor.authorBoyd, M
dc.contributor.authorBulman, M
dc.contributor.authorShenton, Andrew
dc.contributor.authorSmith, L
dc.contributor.authorIddenden, R
dc.contributor.authorWoodward, Emma
dc.contributor.authorLalloo, Fiona
dc.contributor.authorMaher, Eamonn R
dc.contributor.authorEvans, D Gareth R
dc.date.accessioned2009-06-11T13:15:06Z
dc.date.available2009-06-11T13:15:06Z
dc.date.issued2006-07-19
dc.identifier.citationPhenocopies in BRCA1 and BRCA2 families: evidence for modifier genes and implications for screening. 2007, 44 (1):10-15 J. Med. Genet.en
dc.identifier.issn1468-6244
dc.identifier.pmid17079251
dc.identifier.doi10.1136/jmg.2006.043091
dc.identifier.urihttp://hdl.handle.net/10541/70215
dc.description.abstractBACKGROUND: The identification of BRCA1 and BRCA2 mutations in familial breast cancer kindreds allows genetic testing of at-risk relatives. Those who test negative are usually reassured and additional breast cancer surveillance is discontinued. However, we postulated that in high-risk families, such as those seen in clinical genetics centres, the risk of breast cancer might be influenced not only by the BRCA1/BRCA2 mutation but also by modifier genes. One manifestation of this would be the presence of phenocopies in BRCA1/BRCA2 kindreds. METHODS: 277 families with pathogenic BRCA1/BRCA2 mutations were reviewed and 28 breast cancer phenocopies identified. The relative risk of breast cancer in those testing negative was assessed using incidence rates from our cancer registry based on local population. RESULTS: Phenocopies constituted up to 24% of tests on women with breast cancer after the identification of the mutation in the proband. The standardised incidence ratio for women who tested negative for the BRCA1/BRCA2 family mutation was 5.3 for all relatives, 5.0 for all first-degree relatives (FDRs) and 3.2 (95% confidence interval 2.0 to 4.9) for FDRs in whose family all other cases of breast and ovarian cancer could be explained by the identified mutation. 13 of 107 (12.1%) FDRs with breast cancer and no unexplained family history tested negative. CONCLUSION: In high-risk families, women who test negative for the familial BRCA1/BRCA2 mutation have an increased risk of breast cancer consistent with genetic modifiers. In light of this, such women should still be considered for continued surveillance.
dc.language.isoenen
dc.subjectBreast Canceren
dc.subjectOvarian Canceren
dc.subject.meshAdult
dc.subject.meshAged
dc.subject.meshAged, 80 and over
dc.subject.meshBreast Neoplasms
dc.subject.meshFamily
dc.subject.meshFemale
dc.subject.meshGenes, BRCA1
dc.subject.meshGenes, BRCA2
dc.subject.meshGenetic Predisposition to Disease
dc.subject.meshGenetic Screening
dc.subject.meshHumans
dc.subject.meshMiddle Aged
dc.subject.meshMutation
dc.subject.meshOvarian Neoplasms
dc.subject.meshPhenotype
dc.titlePhenocopies in BRCA1 and BRCA2 families: evidence for modifier genes and implications for screening.en
dc.typeArticleen
dc.contributor.departmentAcademic Unit of Medical Genetics and Regional Genetics Service, St Mary's Hospital, Manchester, UK.en
dc.identifier.journalJournal of Medical Geneticsen
html.description.abstractBACKGROUND: The identification of BRCA1 and BRCA2 mutations in familial breast cancer kindreds allows genetic testing of at-risk relatives. Those who test negative are usually reassured and additional breast cancer surveillance is discontinued. However, we postulated that in high-risk families, such as those seen in clinical genetics centres, the risk of breast cancer might be influenced not only by the BRCA1/BRCA2 mutation but also by modifier genes. One manifestation of this would be the presence of phenocopies in BRCA1/BRCA2 kindreds. METHODS: 277 families with pathogenic BRCA1/BRCA2 mutations were reviewed and 28 breast cancer phenocopies identified. The relative risk of breast cancer in those testing negative was assessed using incidence rates from our cancer registry based on local population. RESULTS: Phenocopies constituted up to 24% of tests on women with breast cancer after the identification of the mutation in the proband. The standardised incidence ratio for women who tested negative for the BRCA1/BRCA2 family mutation was 5.3 for all relatives, 5.0 for all first-degree relatives (FDRs) and 3.2 (95% confidence interval 2.0 to 4.9) for FDRs in whose family all other cases of breast and ovarian cancer could be explained by the identified mutation. 13 of 107 (12.1%) FDRs with breast cancer and no unexplained family history tested negative. CONCLUSION: In high-risk families, women who test negative for the familial BRCA1/BRCA2 mutation have an increased risk of breast cancer consistent with genetic modifiers. In light of this, such women should still be considered for continued surveillance.


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