TNFRSF11B and ovarian cancer: Due to the demonstrated anti-apoptotic effect of osteoprotegerin in patients with ovarian cancer [24], and the fact of the presence of this protein in soluble form, it seems interesting to know also the systemic changes occurring in the sTRAIL/OPG system and to assess the possible diagnostic usefulness of the determination of the concentration of tested parameters in female serum with ovarian cancer.