Volume 115, Issue 8 pp. 917-923
RESEARCH ARTICLE

Using the 21-gene assay from core needle biopsies to choose neoadjuvant therapy for breast cancer: A multicenter trial

Harry D. Bear MD, PhD

Corresponding Author

Harry D. Bear MD, PhD

Virginia Commonwealth University and Massey Cancer Center, Richmond, Virginia

Correspondence

Harry D. Bear, MD, PhD, Division of Surgical Oncology, VCUHS, Box 980011, Richmond, VA 23298–0011.

Email: [email protected]

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Wen Wan PhD

Wen Wan PhD

Virginia Commonwealth University and Massey Cancer Center, Richmond, Virginia

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André Robidoux MD

André Robidoux MD

Centre Hospitalier de l'Universite de Montreal, Montreal, Quebec, Canada

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Peter Rubin MD

Peter Rubin MD

Cone Health Cancer Center, Greensboro, North Carolina

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Steven Limentani MD

Steven Limentani MD

Carolinas Medical Center, Charlotte, North Carolina

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Richard L. White Jr MD

Richard L. White Jr MD

Carolinas Medical Center, Charlotte, North Carolina

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James Granfortuna MD

James Granfortuna MD

Cone Health Cancer Center, Greensboro, North Carolina

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Judith O. Hopkins MD

Judith O. Hopkins MD

Forsyth Regional Cancer Center, Winston Salem, North Carolina

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Dwight Oldham MD

Dwight Oldham MD

Lynchburg Hematology Oncology Clinic, Lynchburg, Virginia

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Angel Rodriguez MD

Angel Rodriguez MD

Methodist Hospital, Houston, Texas

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Amy P. Sing MD

Amy P. Sing MD

Genomic Health, Inc., Redwood City, California

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First published: 13 April 2017
Citations: 74
Present address of Peter Rubin: Southern Maine Health Care, Biddeford, ME.
Present address of Wen Wan: University of Chicago. Chicago, IL.
Present address of Steven Limentani: Novant Health, Charlotte, NC.
Preliminary results of this study were presented, in part, at the 39th Annual San Antonio Breast Cancer Symposium, December 8, 2016. The work described in this manuscript is original research.
Trial Registration: ClinicalTrials.gov: NCT01293032; CTRP ID: NCI-2010-02342.

Abstract

Objective

We hypothesized that the Oncotype Dx® 21-gene Recurrence Score (RS) could guide neoadjuvant systemic therapy (NST) to facilitate breast conserving surgery (BCS) for hormone receptor positive (HR+) breast cancers.

Methods

This study enrolled patients with HR+, HER2-negative, invasive breast cancers not suitable for BCS (size ≥ 2 cm). Core needle biopsy blocks were tested. For tumors with RS < 11, patients received hormonal therapy (NHT); patients with RS > 25 tumors received chemotherapy (NCT); patients with RS 11-25 were randomized to NHT or NCT. Primary endpoint was whether 1/3 or more of randomized patients refused assigned treatment.

Results

Sixty-four patients were enrolled. Of 33 patients with RS 11-25, 5 (15%) refused assignment to NCT. This was significantly lower than the 33% target (binomial test, P = 0.0292). Results for clinical outcomes (according to treatment received for 55 subjects) included successful BCS for 75% of tumors with RS < 11 receiving NHT, 72% for RS 11-25 receiving NHT, 64% for RS 11-25 receiving NCT, and 57% for RS > 25 receiving NCT.

Conclusions

Using the RS to guide NST is feasible. These results suggest that for patients with RS < 25 NHT is a potentially effective strategy.

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