[Critical observations on changes in gamma-glutamyl-transpepdidase in hepatopathies].

The behaviour of gamma-glutamyl transpeptidase was compared with other serum enzyme activities and functional parameters in a carefully selected and relatively extensive series of patients with liver disease, including alcoholics, in an investigation of the underlying pathogenesis and its clinical expression. Reference. to the literature and to personal data showed that increased gamma-glutamyl transpeptidase levels could be attributed to enzyme induction (caused by drugs or alcohol), liver damage in the broad sense, and intra- or extrahepatic cholestasis. These causes were individually predominant, or nearly so, on occasions, though their concomitance was more common. High levels, however, were not pathognomonic for a given disease. In alcoholism, they were highly indicative, especially if accompanied by GLD changes. They were a virtually constant, early, and typical finding in intra- and extra-hepatic cholestasis, and tended to persist for a time after the resolution of icterus. Lastly, they were an aid in the early diagnosis of aggressive hepatitis and liver cancer.