GAPDH and neoplasm: The relative expression of the archetypal, full-length, transmembrane MUC1 isoform, MUC1-TM, normalised to GAPDH, was significantly greater in the cells from pleural effusion (P<0.0001) and surgically-excised tumour (P=0.001) mesothelioma samples than that in normal mesothelial cells (Figure 2).