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Journal Article
Research Support, Non-U.S. Gov't
Paclitaxel and cisplatin sensitivity of ovarian carcinoma cell lines tested with the 96-well plate clonogenic assay.
Anticancer Research 1996 July
Platinum based chemotherapy is the cornerstone of treatment in advanced ovarian carcinoma. Paclitaxel, an unique antimicrotubule agent has shown significant clinical activity in cisplatin-resistant tumours, indicating a lack of cross-resistance. To compare the in vitro sensitivity of ovarian carcinoma to cisplatin and paclitaxel, we tested 7 ovarian carcinoma cell lines with the 96-well plate clonogenic assay. Chemosensitivity was expressed as the IC50 value i.e. the drug concentration causing 50% inhibition of clonogenic survival. IC50 values were obtained from dose-response curves after fitting the data to the linear quadratic equation. The IC50 values for paclitacel were 0.4-3.4 nM, showing an 8.5-fold difference between various cell lines. The IC50 values for cisplatin were 0.1-0.45 ug ml-1 showing only a 4.5-fold difference. This variance is clearly smaller than the 25-fold difference observed with the same method in endometrial carcinoma cell lines (Rantanen et al, Br J Cancer 69: 482-86, 1994). In accordance with clinical findings, no cross-resistance or correlation between sensitivity to paclitaxel and cisplatin could be demonstrated.
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