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Basal markers and prognosis in luminal breast cancer

Engstrøm, Monica J; Valla, Marit; Bofin, Anna M.
Journal article, Peer reviewed
Accepted version
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Basalmarkers.pdf (565.8Kb)
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http://hdl.handle.net/11250/2496463
Utgivelsesdato
2017
Metadata
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Samlinger
  • Institutt for klinisk og molekylær medisin [1998]
  • Institutt for samfunnsmedisin og sykepleie [1706]
  • Publikasjoner fra CRIStin - NTNU [19694]
Originalversjon
Breast Cancer Research and Treatment. 2017, 163 (2), 207-217.   10.1007/s10549-017-4182-z
Sammendrag
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.
Utgiver
Springer Verlag
Tidsskrift
Breast Cancer Research and Treatment

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