Evaluation of Biomarkers Associated With Response to Subsequent Therapies in Subjects With HER2-Positive Metastatic Breast Cancer

This was a multicenter, open-label, Phase II study in subjects with Human epidermal growth factor receptor (HER2)-positive metastatic breast cancer who received at least 2 prior lines of anti-HER2-targeted therapies of which at least one included a Trastuzumab-containing regimen. This study was a post-approval commitment with regulatory authorities. It was designed to evaluate whether treatment with Dual blockade promoted changes to biomarkers associated with immunomodulation.