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Molecular subtyping of male breast cancer using alternative definitions and its prognostic impact
Vastmanland County Hospital, Sweden .
Lund University, Sweden .
Örebro University Hospital, Sweden .
Linköping University, Department of Clinical and Experimental Medicine, Oncology. Linköping University, Faculty of Health Sciences.
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2013 (English)In: Acta Oncologica, ISSN 0284-186X, E-ISSN 1651-226X, Vol. 52, no 1, 102-109 p.Article in journal (Refereed) Published
Abstract [en]

Background. Male breast cancer (MBC) is an uncommon disease and there is limited information on the prognostic impact of routinely used clinicopathological parameters. Material and methods. In a retrospective setting, we reviewed 197 MBC patients with accessible paraffin-embedded tumor tissue and clinicopathological data. Immunohistochemical (IHC) stainings were performed on tissue microarrays and histological grading on conventional slides. Cox proportional regression models were applied for uni- and multivariate analyses using breast cancer death as the event. Results. Estrogen receptor (ER) and progesterone receptor positivity were demonstrated in 93% and 77% of patients, respectively. Nottingham histologic grade (NHG) III was seen in 41% and HER2 positivity in 11%. Classification into molecular subtypes using IHC markers according to three alternative definitions revealed luminal A and luminal B in 81% vs. 11%; 48% vs. 44% and 41% vs. 42% of cases. Two cases of basal-like were identified, but no cases of HER2-like. Factors associated with an increased risk of breast cancer death were node positivity (HR 4.5; 95% CI 1.8-11.1), tumor size andgt;20 mm (HR 3.3; 95% CI 1.4-7.9) and ER negativity (HR 10.9; 95% CI 3.2-37.9). No difference in breast cancer death between the luminal subgroups was demonstrated, regardless of definition. Conclusion. MBC tumors were more often of high grade, whereas HER2 overexpression was as frequent as in FBC. Lymph nodes, tumor size and ER status were independent predictors of breast cancer death. The prognostic impact of molecular subtyping in MBC seems to differ from that previously established in FBC.

Place, publisher, year, edition, pages
Informa Healthcare , 2013. Vol. 52, no 1, 102-109 p.
National Category
Medical and Health Sciences
URN: urn:nbn:se:liu:diva-88364DOI: 10.3109/0284186X.2012.711952ISI: 000312505900013OAI: diva2:602879

Funding Agencies|Regional Research Foundation in Uppsala-Orebro||Lions Cancer Foundation||University Hospital, Uppsala||Vastmanlands Research Foundation||

Available from: 2013-02-04 Created: 2013-02-04 Last updated: 2013-02-04

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