In multivariate logistic regression analysis (Table 5) with positivity of Napsin A in ovarian tumors as endpoint, clear cell tumors was the only independent predictive factor (OR = 153, 95% C.I. 21–1107, p < 0.001) in analysis together with age, FIGO sub-stages (I / II) and tumor grade (G1/G2 + G3). This evidence concerns the gene NAPSA and ovarian neoplasm.