Results in Figure 2B show that neither the pancreatic carcinoma cell lines, IMIM-PC-1, IMIM-PC-2 and RWP-1 nor the new added cell lines Hs 766 T, BxPC-3 and PANC-1 express the longer 5′UTR MDR1 mRNA, suggesting a generalized translational control of Pgp expression in human pancreatic carcinoma cell lines, since the new added cell lines were also negative for Pgp expression in Western blot analysis (data not shown). This evidence concerns the gene ABCB1 and exocrine pancreatic carcinoma.