Maintenance Therapy Improves Survival Outcomes in Patients with Advanced Non-small Cell Lung Cancer

We read with great interest the recent article entitled ‘‘Maintenance Therapy Improves Survival Outcomes in Patients with Advanced Non-small Cell Lung Cancer: A Meta-analysis of 14 Studies’’ published in Lung by Lu et al. [1]. The article demonstrated that single agent (SA) switch maintenance therapy (MT) is associated with improved overall survival (OS) and progression-free survival (PFS) of advanced non-small cell lung cancer (NSCLC) patients. Nevertheless, we had a few queries and would appreciate if the authors could provide further clarification.