Des-gamma-carboxy (abnormal) prothrombin as a serum marker of primary hepatocellular carcinoma

H A Liebman, B C Furie, M J Tong, R A Blanchard, K J Lo, S D Lee, M S Coleman, B Furie
New England Journal of Medicine 1984 May 31, 310 (22): 1427-31
We detected des-gamma-carboxy prothrombin, an abnormal prothrombin, in the serum of 69 of 76 patients (91 per cent) with biopsy-confirmed hepatocellular carcinoma (the mean level of the abnormal prothrombin was 900 ng per milliliter). In contrast, levels of the abnormal prothrombin were low in patients with chronic active hepatitis (mean, 10 ng per milliliter) or metastatic carcinoma involving the liver (mean, 42 ng per milliliter), and undetectable in normal subjects. In five patients treated with vitamin K there was no reduction in abnormal prothrombin, indicating that its presence was not due to vitamin K deficiency. Surgical resection of tumors in two patients and chemotherapy in one patient markedly reduced abnormal-prothrombin concentrations, which later increased with recurrence of disease. Serum alpha-fetoprotein levels correlated poorly with abnormal-prothrombin levels. Together, the assay for abnormal prothrombin and the alpha-fetoprotein assay identified 64 of 76 patients with hepatoma (84 per cent). Abnormal prothrombin may be useful in the laboratory diagnosis of primary hepatocellular carcinoma.

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