CDKN2A and neoplasm: We found reduction of expression in AIP-FIPA tumours compared to sporadic adenomas for probe 209644_x_at directed to the Exon 1 of the p19ARF isoform (Fig. 7C and Supplementary Fig. 8F, G), while no difference was found for probe 211156_at directed to the Exon 1 of the p16 isoform or for probe 207039_at directed to the common Exon 3 for both isoforms.