Pretest results indicated that the APs had prior knowledge of genetic testing to inform practice, primarily of BRCA1, BRCA2, HER/ErbB, and Oncotype DX as indicated by write-in responses to questions A, B, C, and D. Contrary to tumor-centered testing, participants reported limited clinical experience with or education regarding patients’ genomic variations affecting medication efficacy in the breast cancer setting. This evidence concerns the gene EGFR and breast carcinoma.