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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Human placental alkaline phosphatase in benign and malignant ovarian neoplasia.
Cancer Research 1985 Februrary
In benign and malignant ovarian tumor patients, human placental alkaline phosphatase (HPLAP) was determined in serum and extracts from surgical tumor biopsies using a highly specific enzyme-antigen immunoassay based on a mouse monoclonal antibody (E6) to HPLAP. Serum HPLAP levels greater than or equal to 0.1 unit/liter were found in 58% of ovarian cancer patients. Serum carcinoembryonic antigen levels were positive (greater than 5.4 ng/ml) in 17% of these patients. HPLAP was detected in extracts from 13 of the 14 tumors investigated (range, 2.4 to 557 milliunits/g). Only the mixed heterologous Müllerian sarcoma was negative. The highest HPLAP content of normal ovarian tissue was 1.1 milliunits/g. The amount of heat-stable and L-p-bromotetramisole-insensitive alkaline phosphatase was in all cases much higher than the fraction recognized by E6. The neoplastic origin of HPLAP was confirmed immunohistochemically on paraffin sections by an indirect avidin-biotin-peroxidase staining procedure using E6. The staining pattern was compared to the histochemical distribution of total alkaline phosphatase on adjacent sections. A consistency was found between the amount of HPLAP in tissue extracts and its immunohistochemical distribution. In all the tumors, staining for HPLAP was observed mainly on the plasma membranes of carcinoma cells. In 9 of the 10 carcinomas, the histological distribution of HPLAP and also of total alkaline phosphatase was heterogeneous. HPLAP staining, present in one of five normal ovaries, was restricted to germinal inclusion cysts. The present results support the hypothesis that serous ovarian tumors originate from these cysts.
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