Fulvestrant Plus Anlotinib in HR(+)/HER2(-) Metastatic Breast Cancer With FGFR Mutation

Endocrine therapy resistance is an unsolved problem in the treatment of HR+/HER2- metastatic breast cancer. Previous studies have shown that the FGF signaling pathway is closely related to endocrine therapy resistance in breast cancer, but there is not sufficient evidence for the combination of endocrine therapy and FGFR inhibitors. Anlotinib is a highly effective VEGFRs, FGFRs, PDGFRs multi-target tyrosine kinase inhibitor, which can effectively block the migration and proliferation of endothelial cells and reduce tumor microvessel density. The drug inhibits VEGFRs, FGFRs, PDGFRs to exert anti-angiogenesis effects and to achieve anti-tumor effects. Therefore, we conducted this single-arm, single-center phase II clinical study to evaluate the efficacy and the safety of anlotinib combined with fulvestrant in patients with metastatic HR-positive and HER2-negative breast cancer patients with FGFR mutation and resistance to aromatase inhibitor therapy, to provide new treatment options for these patients.