Impact Of Oncotype-Dx Testing On Choice Of Chemotherapy.

e12049Background: The Oncotype DX test has been shown to change treatment plans in ~30% of cases, but it is unclear if it changes the type of chemotherapy offered. We sought to determine if the availability of Oncotype DX testing in BC resulted in a change in the type of chemotherapy regimens used on early stage breast cancer pts. Methods: This was a cohort study in which pts treated in the 2 years prior to the availability of Oncotype Dx testing were compared to pts treated in the 2 years after it became available in BC. Charts were audited and divided into pre- and post- availability of Oncotype DX testing. The groups were compared for differences in length of chemotherapy (12 vs u003e 12 weeks), type of agents used (anthracycline vs non-anthracycline) and myelosuppressive potential of regimen chosen. Results: A total of 831 pts fulfilled enrollment criteria; 360 were seen in the pre Oncotype era and 471 were seen in the post Oncotype era. A total of 250 (30.1%) pts were treated with chemotherapy in both co...