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Alkaline phosphatase expression in human cell lines derived from primary hepatomas.

Isozyme patterns of alkaline phosphatase (ALP) were electrophoretically examined in human cell lines derived from one hepatoblastoma, five hepatocellular carcinomas (HCCs) and two cholangiocellular carcinomas. Most of the cell lines tested had a liver-type ALP isozyme. In addition, an abnormal ALP isozyme, which was similar to variant ALP, was detected in one hepatoblastoma and two HCC cell lines. One HCC cell line of these variant-like ALP-positive cell lines was alpha-fetoprotein (AFP)-negative. These findings suggest that variant-like ALP may be useful for the identification of human hepatoma cell lines, especially in AFP or albumin-negative cell lines.