E-ISSN: 2587-0831 ISSN: 2587-0831
The Correlation of Magee Equations<sup>TM</sup> and Oncotype DX<sup>®</sup> Recurrence Score From Core Needle Biopsy Tissues in Predicting Response to Neoadjuvant Chemotherapy in ER+ and HER2- Breast Cancer
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Original Article
VOLUME: 16 ISSUE: 2
P: 117-123
April 2020

The Correlation of Magee EquationsTM and Oncotype DX® Recurrence Score From Core Needle Biopsy Tissues in Predicting Response to Neoadjuvant Chemotherapy in ER+ and HER2- Breast Cancer

Eur J Breast Health 2020;16(2):117-123
DOI: 10.5152/ejbh.2020.5338
Atilla Soran 1
Kaori Tane 1,2
Efe Sezgin 3
Rohit Bhargava 4
1. Division of Breast Surgery and Lymphedema Program, Magee-Womens Hospital of University of Pittsburgh Medical Center, Suite 2601, 300 Halket Street, Pittsburgh, PA, USA
2. Division of Breast Surgery, Hyogo Cancer Center, Akashi, Hyogo, Japan
3. Department of Food Engineering, Laboratory of Nutrigenomics and Epidemiology, İzmir Institute of Technology, İzmir, Turkey
4. Department of Pathology, Magee-Womens Hospital of University of Pittsburgh Medical Center, Pittsburgh, PA, USA
No information available.
No information available
Received Date: 17.12.2019
Accepted Date: 09.02.2020
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ABSTRACT

Objective:

Oncotype DX® recurrence score (RS) can be predicted from Magee EquationsTM (MS) postoperatively. The aim of this study is to investigate correlation of MS with RS from pretreatment core needle biopsy (CNB) tissues, and their clinical usefulness in prediction of response to neoadjuvant chemotherapy (NCT) in estrogen receptor-positive and human epidermal growth factor receptor 2-negative (ER+/HER2-) breast cancer (BC).

Materials and Methods:

Pretreatment CNB tissue samples from 60 patients with ER+/HER2- invasive BC were analyzed for MS and RS correlation. MS and RS were categorized as follows: low (<18), intermediate (18–30), and high (≥ 31). Percentage Tumor size Reduction (%TR) was used to assess tumor response to NCT, and substantial %TR was defined as at least 50% reduction (≥50%TR). Correlation between MS and RS, and predictive factors for the ≥50%TR achievement were assessed.

Results:

MS and RS represented a strong correlation (Spearman's correlation; r=0.58, p<0.0001) as a continuous variable. As a categorical variable, the concordance between MS and RS was 43.3%, and it increased to 80% (r=0.61, p=0.003) with the exclusion of the intermediate risk categories. Although, there was pathologic complete response (pCR), MS showed the highest predictive power for the ≥50% TR achievement, none of the factors were statistically significant (p≥0.07).

Conclusion:

Our study demonstrated that there was a strong correlation between MS and RS from pretreatment biopsy tissue samples in ER+ and HER2- invasive BC.