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Contrasting breast cancer molecular subtypes across serial tumor progression stages: biological and prognostic implications.

Artikel i vetenskaplig tidskrift
Författare Siker Kimbung
Anikó Kovács
Anna Danielsson
Pär-Ola Bendahl
Kristina Lövgren
Marianne Frostvik Stolt
Nicholas P Tobin
Linda Lindström
Jonas Bergh
Zakaria Einbeigi
Mårten Fernö
Thomas Hatschek
Ingrid Hedenfalk
Publicerad i Oncotarget
Volym 6
Nummer/häfte 32
Sidor 33306-18
ISSN 1949-2553
Publiceringsår 2015
Publicerad vid Institutionen för kliniska vetenskaper, Avdelningen för onkologi
Sidor 33306-18
Språk en
Länkar dx.doi.org/10.18632/oncotarget.5089
Ämneskategorier Cancer och onkologi

Sammanfattning

The relevance of the intrinsic subtypes for clinical management of metastatic breast cancer is not comprehensively established. We aimed to evaluate the prevalence and prognostic significance of drifts in tumor molecular subtypes during breast cancer progression. A well-annotated cohort of 304 women with advanced breast cancer was studied. Tissue microarrays of primary tumors and synchronous lymph node metastases were constructed. Conventional biomarkers were centrally assessed and molecular subtypes were assigned following the 2013 St Gallen guidelines. Fine-needle aspirates of asynchronous metastases were transcriptionally profiled and subtyped using PAM50. Discordant expression of individual biomarkers and molecular subtypes was observed during tumor progression. Primary luminal-like tumors were relatively unstable, frequently adopting a more aggressive subtype in the metastases. Notably, loss of ER expression and a luminal to non-luminal subtype conversion was associated with an inferior post-recurrence survival. In addition, ER and molecular subtype assessed at all tumor progression stages were independent prognostic factors for post-recurrence breast cancer mortality in multivariable analyses. Our results demonstrate that drifts in tumor molecular subtypes may occur during tumor progression, conferring adverse consequences on outcome following breast cancer relapse.

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