EGFR and non-small cell lung carcinoma: <h4>Background</h4>This meta-analysis was designed to explore the relationship between the level of serum potassium and the treatment effect of epidermal growth factor receptor (EGFR) antagonist in advanced non-small cell lung cancer (aNSCLC).<h4>Methods</h4>We searched phase II/III prospective clinical trials on treatment with EGFR antagonists for aNSCLC patients.