Circular RNA expression in extracellular vesicles isolated from serum of patients with endometrial cancer

We aimed to explore the roles of circular RNAs (circRNAs) in extracellular vesicles (EVs) isolated from serum of patients with endometrial cancer. EVs were isolated from serum samples of three patients with stage III adenocarcinoma aged 50-60 years and three matched healthy controls. RNA was extracted from the EVs and analyzed using RNA-seq technique. We got 209 upregulated circRNAs and 66 downregulated circRNAs. Kyoto Encyclopedia of Genes and Genomes pathway analysis indicated that the differentially expressed circRNAs were enriched in five pathways. The expression level of hsa_circ_0109046 and hsa_circ_0002577 was confirmed using real-time quantitative PCR. We identified 275 differentially expressed circRNAs and the expression level of two circRNAs was confirmed using real-time quantitative PCR.