ITGA2 and small cell lung carcinoma: To assess whether ITGB2, ITGB6 and ITGA2 are expressed in SCLC, we performed qRT-PCR-based expression analysis using total RNA extracted from retrospectively collected formalin-fixed paraffin embedded (FFPE) human lung tissues from SCLC patients (n = 5) and control donors (Ctrl, n = 4; Table S2 and Figure 1B).