Abstract
In four cases of cyst of the liver, CA19-9 in the cyst wall was explored immunohistologically.
Three cases without renal failure showed serum CA19-9 level of less than 37 U/ml. Remarkably higher CA19-9 levels in the cystic fluid than the serum ones were shown, namely, more than 10, 000 U/ml in 2 cases and 1, 300 U/ml in one case. In the remaining case with renal failure, CA19-9 was 1, 300 U/ml in the serum or more than 10, 000 U/ml in the cystic fluid. Localized CA19-9 in the epithelial cells of the cyst wall of the liver was found in all the four cases.
From the above findings, it is suggested that the epithelial cells of the hepatic cyst wall secrete CA19-9 into the cystic fluid.
