Abstract
BACKGROUND/OBJECTIVES: Platinum resistant ovarian cancer represents a treatment challenge due to lack of efficient treatments and the absence of prognostic biomarkers. The circulating tumor DNA (ctDNA), methylated homebox A9 (meth-HOXA9), has been suggested as a biomarker for ovarian cancer, and might have a clinical impact in terms of predicting progression and supporting clinical decision making. Hence, this study investigated the prognostic value of meth-HOXA9 in platinum resistant recurrent ovarian cancer (PR-ROC) treated with bevacizumab and tocotrienol. METHODS: Twenty patients with platin-resistant recurrent ovarian cancer were prospectively enrolled in this non-randomized phase II study. The treatment consisted of bevacizumab (Avastin) 10 mg/kg intravenously every three weeks and tocotrienol (Traptol) capsules 300 mg orally three times daily as a continuous treatment. The Level of meth-HOXA9 was measured at baseline and every three weeks. RESULTS: The overall survival (OS) in the cohort was 7.5 months (95% CI 3.0-10.0), and the progression free survival was 4 months (95% CI 1.4-6.6). Comparing meth-HOXA9 ctDNA levels at baseline, there was no statistic significant difference in OS (p = 0.23). CONCLUSIONS: Treatment was well tolerated in this heavily pretreated cohort of PR-ROC patients with expected poor prognostic outcomes, with a few individuals showing extraordinary response in terms of progression free survival. The study was not powered to reproduce evidence of potential of meth-HOXA9 as a prognostic biomarker in PR-ROC.