KEY FINDINGS: Genomic testing in patients with early-stage breast cancer is associated with decreased use of chemotherapy and lower costs in younger patients, and slightly increased use of chemotherapy and higher costs in older patients. Genomic testing in actual practice may "rule out" chemotherapy in younger women, and "rule in" chemotherapy in older women. THE QUESTION. The promise of personalized genomic testing is that it can reduce unnecessary care and costs by predicting which patients are most likely to benefit from a treatment. After surgery, women with early-stage breast cancer face the decision of whether to undergo expensive and potentially toxic chemotherapy to prevent recurrence, although most will not have a recurrence. The 21-gene recurrence score test (RS) was developed in 2004 to predict this risk, and its use in clinical medicine is increasing. In this study of actual treatment patterns, LDI Senior Fellows Andrew Epstein and Peter Groeneveld and colleagues investigate how genomic testing of women with early-stage breast cancer affects subsequent chemotherapy use and medical spending in the year after diagnosis. Journal of Clinical Oncology December 2015.
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