The 21-gene recurrence score assay is a gene-expression assay that provides prognostic and predictive information in hormone receptor positive breast cancer.
The recurrence score based on the 21-gene assay ranges from 0 to 100 and is predictive of chemotherapy benefit when it is higher than 25.
1. Sparano JA et al, N Engl J Med 2018 Sparano JA, Gray RJ, Makower DF, Pritchard KI, Albain KS, Hayes DF, et al. Adjuvant chemotherapy guided by a 21-gene expression assay in breast cancer. N Engl J Med 2018;379(2):111-121.
2. Paik S, Tang G, Shak S, Kim C, Baker J, Kim W, et al. Gene expression and benefit of chemotherapy in women with node-negative, estrogen receptor-positive breast cancer. J Clin Oncol; 2006;24(23):3726-3734