RecruitingPhase 2Drug trialTrial of Neratinib Plus Capecitabine in Subjects With HER2-Negative Metastatic Breast Cancer With Brain Metastases and Abnormally Active HER2 SignalingThe purpose of this research is to look at the safety and effectiveness of a HER2-targeted therapy neratinib when given with capecitabine, a chemotherapy, for breast cancer patients with brain metastases whose tumors were HER2-negative by standard tests but showed abnormal HER2 activity based on the CELsignia results.