alpha 1-Antitrypsin levels were measured in sera of 134 patients with cirrhosis and in 64 with cirrhosis and hepatoma. S-TIC was determined in 105 patients with cirrhosis and in 54 with cirrhosis and hepatoma. The mean alpha 1-at and S-TIC values in patients with cirrhosis were 369.59 +/- 14.072 mg% and 1,808 +/- 0.05 mg/ml respectively. In patients with cirrhosis and hepatoma the mean alpha 1-at level was 406.595 +/- 17.834 mg% and the S-TIC mean values was 2.064 +/- 0.82 mg/ml. Although these values are higher than those found in the healthy controls, the differences are not statistically significant.