ENPP2 and benign neoplasm: To elucidate the clinical significance of ATX expression in patients with EOC, the expression level of ATX from liquid biopsies was analysed in the ascites in patients with benign tumours (n = 27) and EOC (n = 138) and the serum samples from healthy individuals (n = 40) and patients with EOC (n = 79) using ELISA.