A recent PHAR, LLC study evaluated treatment recommendations for patients with lymph node-positive, estrogen receptor-positive breast cancer. Specifically, investigators sought to determine the effect of the 21-gene recurrence score (RS) assay results on physician decision making for such patients. The findings show that the RS result was used in determining treatment more often when patients had tumors less than 5 cm and one to three positive lymph nodes than when tumors were larger and patients had four or more positive nodes. Use of the RS also resulted in an overall reduction in recommendations for chemotherapy. This research was published in the Journal of Oncology Practice.