Abstract
Sera from 242 South African blacks with hepatocellular carcinoma were assayed for unsaturated vitamin B12 binding capacity (UBBC) and vitamin B12 activity. Six patients were younger than 20 years of age, and 24% were younger than 30 years of age. Eighty-four percent of the patients had a slightly raised UBBC and 86% had a slightly elevated vitamin B12 value, but in no patient was an exceptionally high UBBC present. Serum UBBC and vitamin B12 were not higher in younger patients, and raised UBBC values were not related to serum alpha-fetoprotein values. Serum UBBC and vitamin B12 concentrations were not significantly different in patients with and without coexisting cirrhosis. In none of the patients with a UBBC above 3000 pg/ml was the fibrolamellar variant of hepatocellular carcinoma present. The authors conclude that South African blacks with hepatocellular carcinoma do not secrete an abnormal vitamin B12 binding protein.
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