Point: combination versus single-agent chemotherapy: the argument for sequential single agents.

Metastatic breast cancer is a heterogeneous disease, and treatment decisions depend on several individualized patient and tumor characteristics. Although combination therapy often shows improved response rates in metastatic breast cancer, few studies have shown superiority in overall survival. The choice of combination versus sequential single-agent treatment, therefore, must consider many factors, with no one strategy right for all patients. This article reviews several important clinical trials that address this issue, and argues for single-agent sequential therapy for most patients with metastatic breast cancer.