[No authors listed]
An obstacle in chemotherapy of ovarian cancer is the development of drug resistance. Taxol (paclitaxel)-resistance-associated gene-3 (TRAG-3/CSAG2) was found to be overexpressed in a paclitaxel-resistant ovarian carcinoma cell line. However, clinical impact of TRAG-3 in ovarian carcinoma has not been demonstrated previously. For demonstration of potential clinical impact of TRAG-3, immunohistochemistry was applied to determine TRAG-3 protein expression in specimens obtained from ovarian carcinoma patients (n=37) who received a paclitaxel-based chemotherapy at two different time points, initial laparotomy before chemotherapy, and secondary cytoreduction after chemotherapy. The TRAG-3-specific immunohistochemical staining was correlated with clinical outcome. In ovarian carcinoma specimens obtained at the initial laparotomy, an advantage in overall (P < 0.001) and progression-free (P = 0.003) survival for patients with weak TRAG-3 expression could be demonstrated. Tumor specimens excised at secondary cytoreduction procedure were not predictive for clinical outcome. In summary, TRAG-3 was found to be a prognostic factor for the prediction of clinical outcome after the application of paclitaxel-based chemotherapy.
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