ITGB2 and small cell lung carcinoma: Expression analysis by qRT-PCR (Figure 1E-F) confirmed the results obtained by RNA-seq (Figure 1D), high ITGB2 levels were detected in SCLC cell lines (P = 0.005 and P = 0.001), whereas A549 cells showed high ITGB6 levels (P = 0.023 and P = 0.019).