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13.07.2019 | Preclinical study | Ausgabe 3/2019

Breast Cancer Research and Treatment 3/2019

Genomic comparison of paired primary breast carcinomas and lymph node macrometastases using the Oncotype DX Breast Recurrence Score® test

Zeitschrift:
Breast Cancer Research and Treatment > Ausgabe 3/2019
Autoren:
Susan K. Boolbol, Manju Harshan, Manjeet Chadha, Laurie Kirstein, Jean-Marc Cohen, Paula Klein, Joseph Anderson, Deborah Davison, Debbie M. Jakubowski, Frederick L. Baehner, Stephen Malamud
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Abstract

Purpose

Adjuvant therapy decisions may in part be based on results of Oncotype DX Breast Recurrence Score® (RS) testing of primary tumors. When necessary, lymph node metastases may be considered as a surrogate. Here we evaluate the concordance in gene expression between primary breast cancers and synchronous lymph node metastases, based on results from quantitative RT-PCR-based RS testing between matched primary tumors and synchronous nodal metastases.

Methods

This retrospective, exploratory study included patients (≥ 18 years old) treated at our center (2005–2009) who had ER+ , HER2-negative invasive breast cancer and synchronous nodal metastases with available tumor blocks from both sites. Paired tissue blocks underwent RS testing, and RS and single-gene results for ER, PR, and HER2 were explored between paired samples.

Results

A wide distribution of RS results in tumors and in synchronous nodal metastases were modestly correlated between 84 paired samples analyzed (Pearson correlation 0.69 [95% CI 0.55–0.78]). Overall concordance in RS group classification between samples was 63%. ER, PR, and HER2 by RT-PCR between the primary tumor and lymph node were also modestly correlated (Pearson correlation [95% CI] 0.64 [0.50–0.75], 0.64 [0.49–0.75], and 0.51 [0.33–0.65], respectively). Categorical concordance (positive or negative) was 100% for ER, 77% for PR, and 100% for HER2.

Conclusions

There is modest correlation in continuous gene expression, as measured by the RS and single-gene results for ER, PR, and HER2 between paired primary tumors and synchronous nodal metastases. RS testing for ER+ breast cancer should continue to be based on analysis of primary tumors.

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