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The main diagnostic indicators of ovarian cancer (OC), including carbohydrate antigen 125 (CA125) and human epididymis protein 4 (HE4), show good sensitivity and poor specificity or vice versa. This study investigated changes in CA125 and HE4 expression and their correlation in serum-derived exosomes of 55 patients with OC (OC group), 33 patients with malignant tumors (non-OC group), and 55 normal controls (NC group). We compared serum and exosomal CA125 and HE4 levels to determine whether their contents in exosomes were elevated. We al