Prognostic value of P-glycoprotein and proliferative index in advanced low grade serous ovarian carcinomas.

The aim of this study was to test the prognostic value of p-glycoprotein expression and the proliferative index of tumor cells on the clinical response to chemotherapy, on the brief disease-free interval (< 12 months) and on cause-specific survival in advanced ovarian carcinoma. We evaluated 83 ovarian carcinoma patients homogeneous for stage, type and grade histological. Brief disease-free interval and cause-specific survival rates (Kaplan-Meier method) were compared using the log rank test. Multivariate analysis (Cox proportional hazards models) was used to determine the independent effect of each variable on prognosis. In the univariate analysis, P-glycoprotein expression (P < 0.0005) and proliferative index (P = 0.0003 and P = 0.0006) were independent predictors of survival and brief disease-free interval; residual disease was associated with survival (P = 0.021). In multivariate analysis (Cox proportional hazards models), P-glycoprotein expression (P = 0.001 and P = < 0.0005) and proliferative index (P = 0.081 and P = 0.041) were independent predictors of brief disease-free interval and survival. P-glycoprotein expression (P < 0.0005) and proliferative index (P = 0.008) were associated with clinical response to chemotherapy.