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The efficacy of anti-angiogenic agents (AAAs) in epithelial ovarian cancer (EOC) remains unclear. Therefore, we conducted a systematic review and network meta-analysis (NMA) to synthesize evidence of their comparative effectiveness for improving overall survival (OS) among EOC patients. We searched six databases for randomized controlled trials (RCTs) from their inception to February 2021. We performed an NMA with hazard ratios (HRs) and 95%-confidence intervals (CIs) to evaluate comparative effectiveness among different AAAs in chemotherapy-naïve and recurrent EOC. P-score was used to provide an effectiveness hierarchy ranking. Sensitivity NMA was carried out by focusing on studies that reported high-risk chemotherapy-naïve, platinum-resistant, and platinum-sensitive EOC. The primary outcome was OS. We identified 23 RCTs that assessed the effectiveness of AAAs. In recurrent EOC, concurrent use of trebananib (10 mg/kg) with chemotherapy was likely to be the best option (P-score: 0.88, HR 1.67, 95% CI 0.94; 2.94). The NMA indicated that bevacizumab plus chemotherapy followed by maintenance bevacizumab (P-score: 0.99) and pazopanib combined with chemotherapy (P-score: 0.79) both had the highest probability of being the best intervention for improving OS in high-risk chemotherapy-naïve and platinum-resistant EOC, respectively. AAAs may not play a significant clinical role in non-high-risk chemotherapy-naïve and platinum-sensitive EOC.

BackgroundThe efficacy of anti-angiogenic agents (AAAs) in epithelial ovarian cancer (EOC) remains unclear. Therefore, we conducted a systematic review and network meta-analysis (NMA) to synthesize evidence of their comparative effectiveness for improving overall survival (OS) among EOC patients. MethodsWe searched six databases for randomized controlled trials (RCTs) from their inception to February 2021. We performed a NMA with hazard ratios (HRs) and 95% confidence intervals (CIs) to evaluate comparative effectiveness among different AAAs in two disease settings, chemotherapy naïve, and recurrent EOC. P-score was used to provide an effectiveness hierarchy ranking. Sensitivity NMA was carried out by focusing on studies that reported high-risk disease chemotherapy-naïve, platinum-resistant, and platinum-sensitive EOC. The primary outcome was OS.FindingsWe identified 23 RCTs (n=11,560) which assessed effectiveness of eight different AAAs. NMA results showed no significant OS difference among anti-angiogenic agents in chemotherapy-naïve. In recurrent EOC, concurrent use of trebananib (10mg/kg) and chemotherapy was likely to be the best option (P-score: 0.88, NMA estimate versus chemotherapy: HR= 1.67, 95% CI: 0.94; 2.94). The sensitivity NMA indicated that bevacizumab plus chemotherapy with maintenance treatment (P-score: 0.99) and pazopanib plus chemotherapy (P-score: 0.79) had the highest probability of being the best intervention for improving OS in high-risk chemotherapy-naïve and platinum-resistant setting, respectively. InterpretationAAAs may not play a significant clinical role in chemotherapy-naïve and platinum-sensitive EOC. Conversely, the concurrent use of trebananib with chemotherapy was likely to be the best intervention in recurrent EOC.

Introduction: 40-45% of patients with High Grade Serous Ovarian Cancer (HGSOC) will eventually relapse with platinum resistant disease. Tothill et al and TCGA are two independent gene expression datasets which have demonstrated the presence of a mesenchymal molecular subgroup, characterised by upregulation of angiogenesis regulating genes. Angiogenesis is known to be an integral pathological feature of HGSOC and anti-angiogenics have dominated the field of drug development in EOC. However, despite this, anti-angiogenic agents have failed to demonstrate a significant impact on overall survival (OS) benefit. In this study, we asked if platinum resistance could be associated with an improved response to anti-angiogenic agents and what the underlying biological rationale for this could be. Methods: A meta-analysis of 14 phase II and III clinical trials in EOC were used to investigate the association between platinum resistance and response to anti-angiogenic agents. In addition, we analysed gene expression in 12 matched pre- and post-chemotherapy EOC samples. Novel isogenic cisplatin-resistant HGSOC cell lines were established to study the development of an angiogenic phenotype. Further studies were performed in novel ascites-derived primary cell lines from HGSOC patients with known outcomes following platinum-based chemotherapy. Result: In the clinical trial meta-analysis, an OS benefit for antiangiogenics was observed in platinum-resistant disease (p=0.029), whilst platinum-sensitive EOC only derived progression free survival (PFS) (p= Discussion: We have demonstrated that previous platinum therapy for EOC is associated with an increase in tumor PDGFα and VEGF-A expression, correlating with a response to anti-angiogenic therapies. This data suggests that platinum therapy resistance may inform the selection of EOC patients for novel antiangiogenic therapies in future clinical trials. Citation Format: Aya El Helali, Nuala McCabe, Christopher Steele, Lara Dura Perez, Christina L. O'Neill, Naomi Dickson, Niamh McGivern, Caolan Harkin, Andrena McCavigan, Reinhold J. Medina, Laura A. Knight, Stephen McQuaid, Jacqueline A. James, Caroline O. Michie, Charlie Gourley, W Glenn McCluggage, Denis P. Harkin, Richard H. Wilson, Alan W. Stitt, Richard D. Kennedy. Platinum resistance in epithelial ovarian cancer is dependent on a PDGFR alpha-VEGF-A signalling mechanism that activates downstream angiogenesis pathways [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2018; 2018 Apr 14-18; Chicago, IL. Philadelphia (PA): AACR; Cancer Res 2018;78(13 Suppl):Abstract nr 7.

5578Background: Patients with High Grade Serous Ovarian Cancer (HGSOC) initially respond to SOC platinum based treatment but most will eventually relapse with platinum resistant disease. Angiogenes...

12111Background: Unsupervised hierarchical clustering of gene expression data from 265 high grade serous ovarian cancer (HGSOC) patients identified 3 major molecular subgroups. One subgroup is driv...