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Annals of Surgical Oncology
Published in: Annals of Surgical Oncology 1/2016

01-01-2016 | Breast Oncology

One-Step Nucleic Acid Amplification Assay for Detection of Axillary Lymph Node Metastases in Breast Cancer Patients Treated with Neoadjuvant Chemotherapy

Authors: Kaori Takamoto, MD, Kenzo Shimazu, MD, Yasuto Naoi, MD, Atsushi Shimomura, MD, Masafumi Shimoda, MD, Naofumi Kagara, MD, Seung Jin Kim, MD, Yasuhiro Tamaki, MD, Shinzaburo Noguchi, MD

Published in: Annals of Surgical Oncology | Issue 1/2016

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Abstract

Background

The accuracy of one-step nucleic acid amplification (OSNA) for the detection of lymph node (LN) metastasis in breast cancer patients has been well established. This study aimed to evaluate its accuracy for patients treated with neoadjuvant chemotherapy (NAC).

Methods

For this study, 300 LNs, 115 sentinel lymph nodes (SLNs), and 185 non-SLNs from 88 breast cancer patients treated with NAC were examined by means of histology (hematoxylin and eosin staining and pancytokeratin immunostaining) and OSNA.

Results

The diagnostic accuracy, sensitivity, and specificity of OSNA were respectively 92.3, 88.5, and 93.3 % for all LNs, and the corresponding values were 87.8, 75.0, and 91.2 % for SLNs and 95.1, 97.3, and 94.6 % for non-SLNs. The diagnostic accuracy of OSNA was significantly lower for SLNs than for non-SLNs (P = 0.021), which was attributable to the low sensitivity for detection of micrometastases (micromets) due to lower CK19 mRNA expression detected by in situ hybridization (ISH) in SLN micromets than in non-SLN micromets. For primary breast tumors, CK19 mRNA expression showed a significant reduction after NAC (P = 0.040).

Conclusions

The diagnostic accuracy of OSNA for NAC-treated patients is similar to that for NAC-nontreated patients, but its accuracy is significantly lower for SLNs than for non-SLNs. The findings obtained with CK19 mRNA ISH suggest that most SLN micromets cannot be detected by OSNA due to the reduced expression of CK19 mRNA induced by NAC.
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Metadata
Title
One-Step Nucleic Acid Amplification Assay for Detection of Axillary Lymph Node Metastases in Breast Cancer Patients Treated with Neoadjuvant Chemotherapy
Authors
Kaori Takamoto, MD
Kenzo Shimazu, MD
Yasuto Naoi, MD
Atsushi Shimomura, MD
Masafumi Shimoda, MD
Naofumi Kagara, MD
Seung Jin Kim, MD
Yasuhiro Tamaki, MD
Shinzaburo Noguchi, MD
Publication date
01-01-2016
Publisher
Springer US
Published in
Annals of Surgical Oncology / Issue 1/2016
Print ISSN: 1068-9265
Electronic ISSN: 1534-4681
DOI
https://doi.org/10.1245/s10434-015-4693-y

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