To investigate if discordant results between OSNA-CK19 and histological examination resulted from a sampling bias such that tumor deposits were found exclusively in either slices used for histology, b&d, or slices used for OSNA, a&c, the homogenate of “a” and “c” slices of all these samples was further investigated by QRT-PCR for mRNA markers indicative for epithelial cells (CK19, SFDEF and FOXA1) as well as for CK19 protein by Western Blotting, whenever possible (Table III). This evidence concerns the gene KRT19 and neoplasm.