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Egger’s funnel plot estimated the publication bias of the correlation between SMAD4 and the clinicopathological parameters of NSCLC patients. (A) Age, (B) sex, (C) differentiation, (D) lymph node metastasis, and (E) TNM stage. NSCLC = non-small cell lung cancer, SMAD4 = SMAD family member 4, TNM = tumor node metastasis.
