TNFRSF11B and ovarian cancer: We measured sex steroids (estradiol, estrone, progesterone, and testosterone) and prolactin that are implicated in the development of maternal breast and ovarian cancer [1] and two new biomarkers (osteoprotegerin [OPG] and soluble receptor activator of nuclear factor kappaB ligand [sRANKL]) that have not yet been studied in detail.