Abstract
Purpose
Basal marker expression in triple-negative breast cancers identifies basal-like tumours, and thus separates the TN group into two prognostic groups. However, the expression and prognostic significance of basal markers in luminal breast cancers are poorly described. The aim of this study was to investigate the expression and prognostic value of basal markers (CK5, CK14 and EGFR) in luminal breast cancer.
Methods
A total of 1423 formalin-fixed, paraffin-embedded breast cancer tumours from a well-characterized cohort of Norwegian women, previously reclassified into molecular subtypes using IHC and ISH, were included in the study. For the present study, tumours expressing at least one of the basal markers CK5, CK14 or EGFR were defined as basal marker positive. Cumulative incidence of death from breast cancer and hazard ratio analyses were used to assess prognosis according to basal marker expression.
Results and conclusion
In total, 470 cases (33.0%) were basal marker positive. A higher proportion of the basal marker-positive tumours were of histopathological grade 3 compared to basal marker negative. For hormone receptor-positive, HER2-negative cases, we found better prognosis for basal marker-positive breast cancer compared to basal marker negative. For all subtypes combined, poorer prognosis for basal marker-negative cases was found in histopathological grade 2 tumours but not among grade 1 and 3.
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Acknowledgements
The authors thank the Department of Pathology and Medical Genetics at St. Olav’s Hospital, Trondheim University Hospital, Norway for making the archives available for the study; the Cancer Registry of Norway, and the Norwegian Cause of Death Registry for providing the patient data. Biomedical scientists Borgny Ytterhus and Anette Skjervold have made invaluable contributions to the logistical and laboratory aspects of the study. The Cancer Registry of Norway; Research Council of Norway; and the Liaison Committee between the Central Norway Regional Health Authority and the Norwegian University of Science and Technology supported this work.
Authors’ contribution
MJE contributed to conception and design of the study, interpretation of the IHC markers, carried out statistical analyses, interpretation of the results and drafted the manuscript. MV contributed to discussion and interpretation of the results, interpretation of the IHC markers, review and revision of the manuscript. AMB contributed to discussion and interpretation of the results, interpretation of the IHC markers, review and revision of the manuscript. All authors read and approved the final manuscript.
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Engstrøm, M.J., Valla, M. & Bofin, A.M. Basal markers and prognosis in luminal breast cancer. Breast Cancer Res Treat 163, 207–217 (2017). https://doi.org/10.1007/s10549-017-4182-z
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DOI: https://doi.org/10.1007/s10549-017-4182-z