I read your question and I understand your concern. First I must tell you GGT is a very sensitive test which can be alterel by many factors like alcohol, some antibiotics, some sedatives, some anti-allergic medication and painkillers so I you have taken any of those substances in the days preceding the test that could be the cause. If that is not the case then the causes could be many possible diseases of liver, biliary tract and pancreas. Among those many causes is also cancer but there are many other possible alternatives. Anyway GGT is rarely involved in isolation, usually there are alterations of other liver, biliary or pancreatic tests which guide the possible hypothesis. So I wouldn t go too far ahead in panic and make assumptions if only the GGT is increased, without evaluation of other tests. I hope to have been of some help.