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Medline ® Abstract for Reference 16

of 'Epidemiology, risk factors and the clinical approach to ER/PR negative, HER2-negative (Triple-negative) breast cancer'

A basal epithelial phenotype is more frequent in interval breast cancers compared with screen detected tumors.
Collett K, Stefansson IM, Eide J, Braaten A, Wang H, Eide GE, Thoresen SØ, Foulkes WD, Akslen LA
Cancer Epidemiol Biomarkers Prev. 2005;14(5):1108.
Interval breast cancer reduce the effectiveness of mammography screening programs. We studied 95 interval cancers, diagnosed during 1996 to 2001 as part of the population-based Norwegian Breast Cancer Screening Program. These cases were matched on size (+/-2.0 mm) to 95 screen-detected breast cancers, and the tumors were compared by immunohistochemical methods using tissue microarrays. Patients with interval cancers were more likely to be younger [odds ratio (OR), 4.7; P = 0.0001], to have dense breasts (OR, 3.4; P = 0.004), and to have estrogen receptor-negative tumors (OR, 2.6, P = 0.01), and p53 expression was more frequent (OR, 4.0; P = 0.001). Notably, interval cancers were more likely to have a basal epithelial phenotype, in that expression of cytokeratin 5/6 (OR, 2.3; P = 0.04) and P-cadherin (OR, 2.5; P = 0.04) was more frequent in interval cases than in size-matched, screen-detected tumors. In a logistic regression model, p53 expression, age, and breast density were independent predictors of interval cancers. Our data suggest that breast cancers with a basal epithelial phenotype are more likely than nonbasal breast cancers to present between regular mammograms.
Vascular Biology Program, Karp Family Research Labs 12.125, Children's Hospital, Harvard Medical School, 300 Longwood Avenue, Boston, MA 02115-5737, USA.