{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,3]],"date-time":"2026-10-03T14:17:09Z","timestamp":1791037029953,"version":"4.1.0"},"reference-count":42,"publisher":"BMJ","issue":"1","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["J Med Genet"],"published-print":{"date-parts":[[2007,1]]},"abstract":"<jats:p>\n                  <jats:bold>Background:<\/jats:bold> The identification of <jats:italic>BRCA1<\/jats:italic> and <jats:italic>BRCA2<\/jats:italic> 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 <jats:italic>BRCA1<\/jats:italic>\/<jats:italic>BRCA2<\/jats:italic> mutation but also by modifier genes. One manifestation of this would be the presence of phenocopies in <jats:italic>BRCA1\/BRCA2<\/jats:italic> kindreds.<\/jats:p>\n               <jats:p>\n                  <jats:bold>Methods:<\/jats:bold> 277 families with pathogenic <jats:italic>BRCA1<\/jats:italic>\/<jats:italic>BRCA2<\/jats:italic> 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.<\/jats:p>\n               <jats:p>\n                  <jats:bold>Results:<\/jats:bold> 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 <jats:italic>BRCA1<\/jats:italic>\/<jats:italic>BRCA2<\/jats:italic> 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.<\/jats:p>\n               <jats:p>\n                  <jats:bold>Conclusion:<\/jats:bold> In high-risk families, women who test negative for the familial <jats:italic>BRCA1\/BRCA2<\/jats:italic> 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.<\/jats:p>","DOI":"10.1136\/jmg.2006.043091","type":"journal-article","created":{"date-parts":[[2006,11,1]],"date-time":"2006-11-01T20:14:46Z","timestamp":1162412086000},"page":"10-15","source":"Crossref","is-referenced-by-count":89,"title":["Phenocopies in BRCA1 and BRCA2 families: evidence for modifier genes and implications for screening"],"prefix":"10.1136","volume":"44","author":[{"given":"A","family":"Smith","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"A","family":"Moran","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"M C","family":"Boyd","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"M","family":"Bulman","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"A","family":"Shenton","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"L","family":"Smith","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"R","family":"Iddenden","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"E R","family":"Woodward","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"F","family":"Lalloo","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"E R","family":"Maher","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"D G R","family":"Evans","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"239","published-online":{"date-parts":[[2006,11,1]]},"reference":[{"key":"2025101710435587000_44.1.10.1","doi-asserted-by":"publisher","DOI":"10.1073\/pnas.85.9.3044"},{"key":"2025101710435587000_44.1.10.2","doi-asserted-by":"publisher","DOI":"10.1002\/1097-0142(19940201)73:3<643::AID-CNCR2820730323>3.0.CO;2-5"},{"key":"2025101710435587000_44.1.10.3","doi-asserted-by":"publisher","DOI":"10.1038\/82533"},{"key":"2025101710435587000_44.1.10.4","unstructured":"Broca P . 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