The levels of tumour-associated antigens CEA, CA19-9, and SPan-1 were detected at 98.0 ng ml−1, 5.8, and 6.0 U ml−1 in OCUM-12 cells and 68.7 ng ml−1, 22.3, and 7.5 U ml−1 in OCUM-12/Hypo cells. This evidence concerns the gene CEACAM5 and neoplasm.