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Published in: BMC Cancer 1/2013

Open Access 01-12-2013 | Research article

Preoperative core needle biopsy is accurate in determining molecular subtypes in invasive breast cancer

Authors: Xiaosong Chen, Long Sun, Yan Mao, Siji Zhu, Jiayi Wu, Ou Huang, Yafen Li, Weiguo Chen, Jianhua Wang, Ying Yuan, Xiaochun Fei, Xiaolong Jin, Kunwei Shen

Published in: BMC Cancer | Issue 1/2013

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Abstract

Background

Estrogen receptor (ER), progesterone receptor (PgR), HER2, and Ki67 have been increasingly evaluated by core needle biopsy (CNB) and are recommended for classifying breast cancer into molecular subtypes. However, the concordance rate between CNB and open excision biopsy (OEB) has not been well documented.

Methods

Patients with paired CNB and OEB samples from Oct. 2009 to Feb. 2012 in Ruijin Hospital were included. ER, PgR, HER2, and Ki67 were determined by immunohistochemistry (IHC). Patients with HER2 IHC 2+ were further examined by FISH. Cutoff value for Ki67 high expression was 14%. Molecular subtypes were constructed as follows: Luminal A, Luminal B, Triple Negative, and HER2 positive.

Results

There were 298 invasive breast cancer patients analyzed. Concordance rates for ER, PgR, and HER2 were 93.6%, 85.9%, and 96.3%, respectively. Ki67 expression was slightly higher in OEB than in CNB samples (29.3% vs. 26.8%, P = 0.046). Good agreement (κ = 0.658) was demonstrated in evaluating molecular subtypes between CNB and OEB, with a concordance rate of 77.2%. We also used a different Ki67 cutoff value (20%) for determining Luminal A and B subtypes in HR (hormone receptor) +/HER2- diseases and the overall concordance rate was 79.2%. However, using a cut-point of Ki67 either 14% or 20% for both specimens, there will be about 14% of HR+/HER2- specimens that are called Luminal A on CNB and Luminal B on OEB.

Conclusion

CNB was accurate in determining ER, PgR, and HER2 status as well as non-Luminal molecular subtypes in invasive breast cancer. Ki67 should be retested on OEB samples in HR+/HER2- patients to accurately distinguish Luminal A from B tumors.
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Metadata
Title
Preoperative core needle biopsy is accurate in determining molecular subtypes in invasive breast cancer
Authors
Xiaosong Chen
Long Sun
Yan Mao
Siji Zhu
Jiayi Wu
Ou Huang
Yafen Li
Weiguo Chen
Jianhua Wang
Ying Yuan
Xiaochun Fei
Xiaolong Jin
Kunwei Shen
Publication date
01-12-2013
Publisher
BioMed Central
Published in
BMC Cancer / Issue 1/2013
Electronic ISSN: 1471-2407
DOI
https://doi.org/10.1186/1471-2407-13-390

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