In contrast to the findings of Shyian et al., who describe staining of NaPi2b predominantly at the surface membrane of cancer cells in well differentiated serous and endometrioid ovarian cancer [21], we identified pattern C (both membrane and cytoplasm) as the most common pattern for the malignant tumors, represented in 61% of the tumors. Here, SLC34A2 is linked to ovarian endometrioid adenocarcinoma.