FOXA1 and neoplasm: 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).