FEZF1‐AS1 acts as an oncogene in gastric cancer by activating Wnt signalling pathway or suppressing p21 expression.11, 15 The oncogenic roles of FEZF1‐AS1 were also observed in colorectal cancer and lung cancer.16, 17 Also, LncRNA FEZF1‐AS1 has been revealed as potential therapeutic target, its expression was significantly associated with the overall survival of patients with hepatocellular carcinoma.18 Similarly, in this study, FEZF1‐AS1 was found as oncogenic lncRNA, which was significantly increased in both serums and EOC tissues. Here, FEZF1 is linked to lung cancer.