To accomplish this goal, we evaluated the ability of the FITC-conjugated CPE peptide to label the freshly established primary ovarian tumor cultures in flow cytometry experiments; in parallel, we also evaluated VERO cells (positive controls, [20]), and healthy ovarian cells, fibroblasts, peripheral blood lymphocytes (PBL), lymphoblastoid cell lines (LCL), and healthy human keratinocytes, which do not express detectable levels of claudin-3 or -4 (negative controls). Here, CLDN3 is linked to ovarian neoplasm.