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Forest plots for objective response rate pooled odds ratio by histology (A), chemotherapy (B) and anti-EGFR-mAb (C): Chemotherapy plus anti-EGFR-mAb versus chemotherapy alone for advanced NSCLC. NSCLC = non-small-cell lung cancer; anti-EGFR-mAb = anti-epidermal growth factor receptor monoclonal antibody; CI = confidence interval; SE = standard error; Ch2 = chi-squared test; df = degree of freedom; I2 = I-squared.
