PMID: 9167459May 24, 1997Paper

Pathology of familial breast cancer: differences between breast cancers in carriers of BRCA1 or BRCA2 mutations and sporadic cases. Breast Cancer Linkage Consortium

Lancet

Abstract

A few breast cancer cases are attributable to a hereditary predisposition to the disease. We aimed to compare the histological features of breast cancer in women carrying mutations in the susceptibility genes BRCA1 and BRCA2 with controls unselected for family history. The morphological characteristics of specimens from 440 patients with familial breast cancer, including 118 in carriers of BRCA1 mutations and 78 in carriers of BRCA2 mutations, were compared with those from 547 age-matched controls, unselected for family history, by seven pathologists. Cancers in carriers of BRCA1 (p < 0.0001) and BRCA2 mutations (p = 0.04) were, on average, of a higher overall grade than in controls. For example, the proportions in grade 3 were 66% of 139, 41% of 58 and 36% of 368 specimens, respectively. However, when the three grade indices were considered independently, breast cancers in BRCA1-mutation carriers showed more pleomorphism (p = 0.006), a higher mitotic count (p < 0.0001), and less tubule formation than controls (p = 0.006), whereas cancers in BRCA2-mutation carriers showed less tubule formation (p = 0.003), but no difference in pleomorphism or mitotic count. The occurrence of invasive lobular carcinoma and invasive ductal carcin...Continue Reading

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