TNFRSF11A and neoplasm: This study, therefore, has two main objectives: (i) to investigate whether RANK expression shows a gradation between the three tumor categories (benign, borderline and malignant) of the EOC histotypes (serous, mucinous and endometrioid) and (ii) to explore whether the RANK expression is related to tumor stage within the respective malignant tumor categories of each histotype.