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Poster display

2950 - Prospective evaluation of the impact of the 21-gene recurrence score® assay on adjuvant treatment decisions for women with node-positive breast cancer in Ontario, Canada


10 Oct 2016


Poster display


Sofia Torres


Annals of Oncology (2016) 27 (6): 43-67. 10.1093/annonc/mdw364


S. Torres1, M. Trudeau1, S. Gandhi1, E. Warner1, S. Verma1, K. Pritchard1, T. Petrella1, E. Slodkowska1, M. Hew-Shue1, C. Chao2, A. Eisen1

Author affiliations

  • 1 Medical Oncology, Sunnybrook Odette Cancer Center, Sunnybrook HSC, M4N 3M5 - Toronto/CA
  • 2 Medical Affairs, Genomic Health, Inc., CA 94063 - Redwood City/US


Abstract 2950


The 21-gene Recurrence Score® (RS) assay is reimbursed by the single payer Ontario Health Ministry for node-negative early-stage breast cancer (EBC). We carried out a prospective study to evaluate the impact of the RS® assay on treatment decisions for women with node-positive (N+), estrogen receptor-positive (ER+) EBC.


Women with ER + , human epidermal growth factor receptor 2-negative, EBC and 1-3 positive axillary lymph nodes, who were candidates for adjuvant chemotherapy (CT), in addition to hormonal treatment, were eligible. Primary objective was to characterize how the results of the RS assay impacted decision making processes of medical oncologists by evaluating recommendations for adjuvant therapy prior to and after the RS assay. Secondary objectives were to characterize changes in physician level of confidence in their recommendation, whether the results of the RS assay affected patients' preferences and level of confidence in treatment recommendations, and to evaluate the actual treatment administered.


From October 2014 to May 2016, 68 patients were recruited (target:70 patients); RS assay results are currently available for 64 patients. Mean age was 61 (range: 41-84); 70% were post-menopausal. Tumor size was ≤2 cm in 47%, >2-5 cm in 45% and >5cm in 8%. Tumors were grade 1 in 22%, grade 2 in 58% and grade 3 in 20%. RS was low (


The RS assay resulted in a substantial decrease in the number of N+ patients who would receive CT and in an increase of the physicians' and patients' confidence in the adjuvant treatment recommendations.

Clinical trial identification

NCT02347449 First received: November 17, 2014 Last updated: January 4, 2016 Last verified: January 2016

Legal entity responsible for the study

Sunnybrook Odette Cancer Centre


Genomic Health, Inc


S. Torres: Received fellowship support from Genomic Health. C. Chao: Senior Director, Medical Affairs at Genomic Health, Inc. Stock ownership in Genomic Health Inc. A. Eisen: Principle investigator of the present study. All other authors have declared no conflicts of interest.

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