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Published in: Breast Cancer Research 2/2012

Open Access 01-04-2012 | Research article

Occurrence of breast cancer subtypes in adolescent and young adult women

Authors: Theresa HM Keegan, Mindy C DeRouen, David J Press, Allison W Kurian, Christina A Clarke

Published in: Breast Cancer Research | Issue 2/2012

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Abstract

Introduction

Breast cancers are increasingly recognized as heterogeneous based on expression of receptors for estrogen (ER), progesterone (PR), and human epidermal growth factor receptor 2 (HER2). Triple-negative tumors (ER-/PR-/HER2-) have been reported to be more common among younger women, but occurrence of the spectrum of breast cancer subtypes in adolescent and young adult (AYA) women aged between 15 and 39 years is otherwise poorly understood.

Methods

Data regarding all 5,605 AYA breast cancers diagnosed in California during the period 2005 to 2009, including ER and PR status (referred to jointly as hormone receptor (HR) status) and HER2 status, was obtained from the population-based California Cancer Registry. Incidence rates were calculated by subtype (triple-negative; HR+/HER2-; HR+/HER2+; HR-/HER2+), and logistic regression was used to evaluate differences in subtype characteristics by age group.

Results

AYAs had higher proportions of HR+/HER2+, triple-negative and HR-/HER2+ breast cancer subtypes and higher proportions of patients of non-White race/ethnicity than did older women. AYAs also were more likely to be diagnosed with stage III/IV disease and high-grade tumors than were older women. Rates of HR+/HER2- and triple-negative subtypes in AYAs varied substantially by race/ethnicity.

Conclusions

The distribution of breast cancer subtypes among AYAs varies from that observed in older women, and varies further by race/ethnicity. Observed subtype distributions may explain the poorer breast cancer survival previously observed among AYAs.
Appendix
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Metadata
Title
Occurrence of breast cancer subtypes in adolescent and young adult women
Authors
Theresa HM Keegan
Mindy C DeRouen
David J Press
Allison W Kurian
Christina A Clarke
Publication date
01-04-2012
Publisher
BioMed Central
Published in
Breast Cancer Research / Issue 2/2012
Electronic ISSN: 1465-542X
DOI
https://doi.org/10.1186/bcr3156

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