CYP1A1 and lung adenocarcinoma: For instance, arsenite potentiates CYP1A1 mRNA basal level in human lung adenocarcinoma (H1355) cells (Wu et al., 2008[419]), but has no effect on its basal or inducible protein levels in human lung adenocarcinoma (CL3) cells (Ho and Lee, 2002[151]).