GAPDH and non-small cell lung carcinoma: Five putative RGs (ESD, BTF3, HIST1H2BC, RPL30, YAP1) selected from a meta-analysis of geneChip experiments [21] were validated along with ACTB, GAPDH, RNA18S, PPIA, PGK1, RPLP0 and POLR2A by qPCR assessment of their expression levels on 18 paired normal lung and NSCLC samples.