Treatment for metastatic HER2-negative breast cancer is becoming increasingly individualized as more of the tumor landscape is described and drugs are developed to target its pathways. Survival can be prolonged by CDK4/6 inhibitors in patients with hormone receptor–positive tumors and by immunotherapy in those with triple-negative disease. In patients with BRCA1/2 mutations, PARP inhibitors delay disease progression. Antibody–drug conjugates are expected to become critical components of the treatment landscape, and targeted drugs are proving to benefit small subsets of patients.
Disclosures: Dr. Gradishar has disclosed serving as a scientific advisor for AstraZeneca Pharmaceuticals LP, Daiichi-Sankyo Co., Eli Lilly and Company, ImmunoGen, Inc., MacroGenics, Puma Biotechnology, and Seattle Genetics, Inc.; and receiving honoraria from AstraZeneca Pharmaceuticals LP, Biotheranostics, Daiichi-Sankyo Co., ImmunoGen, Inc.