Breast Cancer Index (BCI), a molecular gene expression–based test used for determining which patients with early-stage, hormone receptor (HR)–positive breast cancer benefit from extended endocrine therapy, is now included in the National Comprehensive Cancer Network (NCCN) Guidelines for breast cancer, according to Biotheranostics, Inc.
Per NCCN recommendations, BCI can be used for consideration of extended adjuvant endocrine therapy with a 2A category of evidence and consensus, which indicates uniform consensus from the organization that the recommendation is appropriate.