Siow ZR, De Boer RH, Lindeman GJ, Mann GB. Spotlight on the utility of the Oncotype DX^® breast cancer assay. Int J Womens Health. 2018 Feb 21;10:89-100.

Summary: Genomic assays such as Oncotype DX have changed the landscape for the treatment of ER-positive early breast cancer. In a USA-based study, there has been a 13% decline in the use of adjuvant chemotherapy in 2006–2008, which has been largely attributed to the introduction of the Oncotype DX in 2004.78 While the Oncotype DX is expensive, the potential cost savings from chemotherapy avoidance and reduced exposure to the side effects of cytotoxic therapy appear to be cost-effective in most jurisdictions. The development and eventual validation of other genomic assays could potentially reduce test costs. While Oncotype DX is currently well validated in the node-negative population, its optimal use remains to be defined for cohorts of patients with intermediate-risk RS, as well as for patients with lymph node-positive disease. Results from the prospective TAILORx and RxPONDER trials will help shed light on these questions.