A Study of Pyrotinib Plus Capecitabine in Patients With Brain Metastases From HER2-positive Metastatic Breast Cancer

Brain metastases occur in 30-50% of patients with metastatic HER2-positive breast cancer. In the case of solitary brain metastases, surgery or stereotactic radiosurgery are the preferred therapeutic approaches.Chemotherapy is used after further progression of disease but it has limited effectiveness. In HER2-positive tumours, trastuzumab therapy has been postulated to be associated with an increased risk of development of brain metastases.Thus new therapeutic options are urgently needed to improve patients'outcome. Pyrotinib is an oral tyrosine kinase inhibitor targeting both HER-1 and HER-2 receptors. We designed the study to explore the possibility of pyrotinib plus capecitabine for brain metastases from HER2-positive metastatic breast cancer.