Elevated preoperative platelet to lymphocyte ratio associated with decreased survival of women with ovarian clear cell carcinoma.

This study was conducted to establish whether the preoperative platelet to lymphocyte ratio (PLR) is predictive of survival of women with ovarian clear cell carcinoma (OCCC). A PLR > 300 was deemed elevated. Progression-free survival (PFS) was estimated using the Kaplan-Meier method. Cox proportional hazard analysis was used to determine the independent effect of PLR. Thirty-six patients were reviewed. Elevated PLRs were more commonly noted in patients with an advanced vs an early stage of disease (88.9% vs 11.1%). Women with elevated PLR carried a higher rate of disease progression during primary therapy than that those in the normal PLR group (44.4 vs 22.2%). The median PFS for patients with elevated PLR was notably worse than that for patients with normal PLR (10 vs 34 months). Despite the impact of elevated PLR on PFS, it was found to be marginally significant when controlling for commonly applied prognostic markers. It, however, trended toward significance (HR=4.76; 95%CI, 0.95-23.8). In conclusion, an elevated PLR appears to be directly associated with adverse survival rather than being a surrogate for other indicators of a poor prognosis. PLR may be a useful biomarker for predicting survival of women with OCCC and merits further large-scale studies.