Abstract 5408: Elevated level of serum miR-1290 is correlated with high-grade serous ovarian epithelial ovarian cancer and might be a potential biomarker

Abstract Objective: There is a critical need for improved diagnostic markers to detect ovarian high grade serous ovarian cancer (HGSOC). MicroRNAs (miRNAs) stably exist in circulating blood, reflecting tissue or organ conditions and present in circulating microvesicles such as exosomes. Recent studies have confirmed the potential use of miRNAs profiling as a novel non-invasive biomarker for diagnosis of HGSOCs. The aim of this study is to identify which miRNAs are highly produced from HGSOCs and analyze whether serum miRNA can discriminate patients with HGSOC from healthy controls. Methods: Secreted exosomes from ovarian cancer cell lines were collected and exosomal miRNAs extracted. miRNA microarray was performed and several elevated miRNAs specific to HGSOCs were picked up. Among these, we focused on miR-1290. Serum from 71 pre-operative, 46 post-operative ovarian cancer patients and 13 healthy controls were gathered and its expression levels were detected by quantitative Real Time PCR. Results: In HGSOC patients, miR-1290 emerged overexpressed compared to healthy controls (3.52-fold). ROC analysis showed that at the cut-off of 1.61(healthy controls ; 1), the sensitivity and specificity were 63 % and 85 % respectively for detecting HGSOC (AUC = 0.71). The AUC of CA125 + miR-1290 combination was 1.00. Its expression singnificantly decreased after operation(5.87 → 1.17 ; P < 0.01). In advanced stage HGSOC patients, moreover, it expressed marginally higher than early stage ones(4.23 VS 1.58 ; P = 0.23). Conclusions: Serum miR-1290 can be a potential diagnostic biomarker for HGSOC. Citation Format: Masaki Kobayashi, Sawada Kenjiro, Yoshimura Akihiko, Miyamoto Mayuko, Nakatsuka Erika, Kodama Michiko, Hashimoto Kae, Mabuchi Seiji, Kimura Tadashi. Elevated level of serum miR-1290 is correlated with high-grade serous ovarian epithelial ovarian cancer and might be a potential biomarker [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 5408.