PROTHROMBIN AND ANTITHROMBIN III IN PATIENTS WITH HEPATOCELLULAR CARCINOMA
Prothrombin (F.II) and antithrombin III (AT III) levels were measured in 11 patients (mean age 61 years) with hepatocellular carcinoma; F.II antigen (Ag) mean levels (Laurell) were 1.39±0.53 U/ml and F.II activity (Ac) (clotting method) 0.9±0.21 U/ml; AT III Ag mean levels (radial immunodiffusion) were 1.18±0.32 U/ml and AT III heparin cofactor (HC) (amidolytic method) 1.15±0.31 U /ml. In 5 patients F.II Ag was higher than 1.2 U/ml; no patient had F.II Ag lower than 0.8 U/ml (normal range 0.7-1.2 U/ml). F.II Ac was in the normal range in all patients. In 4 patients both AT III Ag and HC were higher than 1.2 U/ml; no patient had AT III Ag and HC lower than 0.8 U/ml (normal range 0.75-1.2 U/ml). Seven patients had a long history of liver cirrhosis and 2 of them sho wed AT III Ag and HC of 1.8 U/ml; one of these two patients had F.II Ag and Ac around 1.00 U/ml, whereas the other had F.II Ag 2.4 U/ml and F.II Ac 1.2 U/ml. In these two patients a prelimina ry more extensive study was performed. In both subjects AT III plasma crossed immunoelectrophoresis was normal in the presence and absence of heparin and AT III crossed immunoelectrofocusing (CIEF) showed a normal pattern of 6 peaks (pH 5.2-4.6) and two additional small peaks at pH 4.5 and 5.4. In the patient with in creased F.II Ag the CIEF of plasma prothrombin showed a large peak with asymmetric branches at pH 5.2-4.9, as in the control, and a large additional peak at pH 5.9; after plasma absorption with Al(OH), the F.II CIEF pattern showed only the abnormal peek. We conclude that in patients with hepatocellular carcinoma F.II and AT III are normal, independently of previous history of cirrhosis; moreover, in agreement with previous studies (N.Engl.J. Med. 310,1427,1984), an abnormal prothrombin, which we demonstra ted characterizable by the CIEF, can be synthesized.