To evaluate and to compare the effectiveness of CA-125 and HE4 serum levels in epithelial ovarian cancer (OC) in follow-up in terms of time to detection of elevation after the end of the first line treatment. To evaluate the lead-time of the rise of marker levels before epithelial OC recurrence diagnosis by Computed tomography (CT) imaging method. To evaluate the appropriate HE4 cut-off value for follow-up of patients after the treatment of ovarian, Fallopian tube and primary peritoneal cancer.
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Inclusion Criteria: * advanced ovarian cancer, stage FIGO III and IV * histology types: high-grade serous, low-grade serous, endometrioid, clear cell, undifferentiated * completed ovarian cancer surgery and platinum-based chemotherapy Exclusion Criteria: * positivity of tumor markers CA 125 and HE4 during study enrollment * signs of cancer at computed tomography scan during study enrollment