Summary. A novel protein designated as hepatoma B12 binder (HBB), the predominant vitamin‐B12‐binding protein in the serum of two adolescents with hepatocellular carcinoma, has been characterized. HBB is more acidic and has different electrophoretic mobility and elution behaviour on gel filtration than normal or chronic myeloid leukaemia transcobalamin I. HBB is a member of the family of‘R’type vitamin‐B12‐binding proteins since it immunologically cross reacts with anti‐R antibody and does not deliver vitamin B12 to the cell. HBB is unique in that it is tumour‐related, elaborated in enormous quantity and possesses physical characteristics best explained by a different carbohydrate composition from that of transcobalamin I.
No takes yet. Share an insight, caveat, or question.
Waxman et al. (1974) studied this question.
Synapse has enriched 4 closely related papers on similar clinical questions. Consider them for comparative context: