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• W2095696085 abstract "P-glycoprotein (P-gp) expression and DNA topoisomerase (Topo) II are important variables in multidrug resistant tumor cell lines. The aim of this study was to evaluate P-gp expression and Topo I and II activity in benign and malignant epithelial ovarian tumors. P-gp expression was analyzed immunohistochemically in cryostat sections of fresh tumor specimens. In the same specimens Topo I and II activity were measured by, respectively, relaxation of supercoiled plasmid pBR322 DNA and decatenation of kinetoplast DNA. P-gp expression (range, 5-100% positive staining cells) was found in 3 of 6 cystadenomas, 0 of 2 borderline tumors, 15 of 21 untreated ovarian cancers, and 8 of 13 platinum/cyclophosphamide treated ovarian cancers. Median Topo I and II activity were elevated in malignant ovarian tumors compared to benign and borderline tumors. No difference was found between median Topo I activity in untreated ovarian cancer and platinum/cyclophosphamide treated ovarian cancer. High Topo II activity (greater than or equal to 8 x 10(2) units/mg protein) was more frequent in untreated compared to platinum/cyclophosphamide treated samples. Respectively, 8- and 16-fold differences in Topo I and II activity were found in the malignant tumors. Topo II activity in malignant tumors correlated with Topo I activity (r = 0.36, P less than 0.05) and the tumor volume index (r = 0.35, P less than 0.05). However, this last weak correlation cannot explain the 16-fold differences in Topo II activity in malignant tumors. Mitotic index and P-gp expression did not correlate with Topo I or II activity. A large variability in P-gp expression and Topo I and II activity was observed in patients with ovarian cancer." @default.
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• W2095696085 date "1991-11-01" @default.
• W2095696085 modified "2023-09-23" @default.
• W2095696085 title "P-glycoprotein expression and DNA topoisomerase I and II activity in benign tumors of the ovary and in malignant tumors of the ovary, before and after platinum/cyclophosphamide chemotherapy." @default.
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