Breast Cancer Research and Treatment

, Volume 127, Issue 1, pp 133–142 | Cite as

Comparison of the prognostic and predictive utilities of the 21-gene Recurrence Score assay and Adjuvant! for women with node-negative, ER-positive breast cancer: results from NSABP B-14 and NSABP B-20

  • Gong Tang
  • Steven Shak
  • Soonmyung Paik
  • Stewart J. Anderson
  • Joseph P. Costantino
  • Charles E. GeyerJr.
  • Eleftherios P. Mamounas
  • D. Lawrence Wickerham
  • Norman Wolmark
Clinical trial

Abstract

The Oncotype DX® Recurrence Score® (RS) is a validated genomic predictor of outcome and response to adjuvant chemotherapy in ER-positive breast cancer. Adjuvant! was developed using SEER registry data and results from the Early Breast Cancer Clinical Trialists’ overview analyses to estimate outcome and benefit from adjuvant hormonal therapy and chemotherapy. In this report we compare the prognostic and predictive utility of these two tools in node-negative, ER-positive breast cancer. RS and Adjuvant! results were available from 668 tamoxifen-treated NSABP B-14 patients, 227 tamoxifen-treated NSABP B-20 patients, and 424 chemotherapy plus tamoxifen-treated B-20 patients. Adjuvant! results were also available from 1952 B-20 patients. The primary endpoint was distant recurrence-free interval (DRFI). Cox proportional hazards models were used to compare the prognostic and predictive utility of RS and Adjuvant!. Both RS (P < 0.001) and Adjuvant! (P = 0.002) provided strong independent prognostic information in tamoxifen-treated patients. Combining RS and individual clinicopathologic characteristics provided greater prognostic discrimination than combining RS and the composite Adjuvant!. In the B-20 cohort with RS results (n = 651), RS was significantly predictive of chemotherapy benefit (interaction P = 0.031 for DRFI, P = 0.011 for overall survival [OS], P = 0.082 for disease-free survival [DFS]), but Adjuvant! was not (interaction P = 0.99, P = 0.311, and P = 0.357, respectively). However, in the larger B-20 sub-cohort (n = 1952), Adjuvant! was significantly predictive of chemotherapy benefit for OS (interaction P = 0.009) but not for DRFI (P = 0.219) or DFS (P = 0.099). Prognostic estimates can be optimized by combining RS and clinicopathologic information instead of simply combining RS and Adjuvant!. RS should be used for estimating relative chemotherapy benefit.

Keywords

Breast cancer Oncotype DX Recurrence Score Adjuvant! Node-negative ER-positive 

Supplementary material

10549_2010_1331_MOESM1_ESM.doc (220 kb)
Supplementary material 1 (DOC 220 kb)

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Copyright information

© Springer Science+Business Media, LLC. 2011

Authors and Affiliations

  • Gong Tang
    • 1
    • 2
  • Steven Shak
    • 4
  • Soonmyung Paik
    • 1
  • Stewart J. Anderson
    • 1
    • 3
  • Joseph P. Costantino
    • 1
    • 3
  • Charles E. GeyerJr.
    • 1
    • 5
  • Eleftherios P. Mamounas
    • 1
    • 6
  • D. Lawrence Wickerham
    • 1
    • 5
  • Norman Wolmark
    • 1
    • 5
  1. 1.National Surgical Adjuvant Breast and Bowel Project Operations and Biostatistical Centers, and Pathology DivisionPittsburghUSA
  2. 2.Department of Biostatistics, Graduate School of Public HealthUniversity of PittsburghPittsburghUSA
  3. 3.Department of Biostatistics, Graduate School of Public HealthUniversity of PittsburghPittsburghUSA
  4. 4.Genomic Health IncRedwood CityUSA
  5. 5.Allegheny General HospitalPittsburghUSA
  6. 6.Aultman Health FoundationCantonUSA

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