Specific [3H]fucose-labeled glycoproteins were found in the serum of rats bearing Zajdela hepatoma, which possess different isoelectric points in comparison with serum glycoproteins from normal rats. The electrophoretic profile of the serum glycoproteins is significantly altered. There is approximately a 2.5 times increase of [3H]fucose incorporation into serum glycoproteins from rats with an ascitic form of hepatoma, compared with normal rats and to animals bearing a solid form of the tumor (which have a considerably greater survival). Serum fucoproteins identical for the two forms of hepatoma were isolated, as well as glycoproteins strongly specific for each of the forms.
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