Clinical and biomarker results from phase I/II study of PI3K inhibitor BYL 719 (alpelisib) plus nab-paclitaxel in HER2-negative metastatic breast cancer.

1018Background: Activation of Phosphatidylinositol-3-kinase (PI3K) pathway may confer resistance to taxanes and in preclinical models concomitant inhibition of the PI3K pathway enhances efficacy of...