The pooled OR from 137 lung adenocarcinoma (ADC) and 124 squamous cell carcinoma (SCC) revealed that there was no significant difference of NF-κB expression between ADC and SCC (OR = 1.20, 95% CI = 0.71–2.01, P = 0.50) (Fig 3A). This evidence concerns the gene NFKB1 and squamous cell carcinoma.