ARFGEF3 and lung cancer: Increasing studies have reported that circRNAs play vital roles in cancer.9 In gastric cancer, circ‐KIAA1244 is correlated with cancer progression and patients’ outcome.10 In non‐small cell lung cancer, hsa_circ_0033155 acts as a tumour suppressor to regulate cell proliferation, colony formation and migration.11 However, there are only a few reports exploring circRNAs in ovarian cancer.