High incidence of triple negative breast cancers following pregnancy and an associated gene expression signature

Szilard Asztalos, Thao N. Pham, Peter H. Gann, Meghan K. Hayes, Ryan Deaton, Elizabeth L. Wiley, Rajyasree Emmadi, Andre Kajdacsy-Balla, Nilanjana Banerji, William McDonald, Seema A. Khan, Debra A. Tonetti*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

Breast cancer risk increases transiently in the period following pregnancy; pregnancy-associated breast cancers (PABC) are more aggressive than cases diagnosed in nulliparous women. We have previously reported that in the normal human breast pregnancy results in the upregulation of a number of inflammation related genes, suggesting a pro-tumorigenic environment as well as downregulation of ESR1 (ERα) and ERBB2 (HER2) and upregulation of ESR2 (ERβ), suggesting a protective effect. In this study, we aimed to investigate the possibility of differential regulation of the same gene set modulated in the normal breast, in human breast tumors following pregnancy. Gene expression was measured by real-time PCR on tumor regions isolated by laser capture microdissection from paraffin sections. Immunohistochemistry was performed on tissue microarrays (TMA) for protein expression. Hierarchical clustering was performed using the average linkage method to determine coordinate expression of sets of genes. We find that breast cancers detected within 10 years following pregnancy display a different gene expression pattern than those detected in nulliparous breast cancer patients. The gene expression difference is mainly attributable to a triple negative (TNBC) subgroup found to be more frequent in PABCs up to 10 years following a pregnancy. We also show that protein and mRNA expression levels correlate in half of the proteins tested by TMA. Despite the fact that this is a small study of 53 patients, we identified a gene expression signature that is differentially expressed in pregnancy-associated TNBC.

Original languageEnglish (US)
Article number710
Pages (from-to)1-9
Number of pages9
JournalSpringerPlus
Volume4
Issue number1
DOIs
StatePublished - Dec 1 2015

Keywords

  • Inflammation
  • Parity
  • Pregnancy-associated breast cancer
  • Triple negative breast cancer

ASJC Scopus subject areas

  • General

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