These data combined with the high expression of claudin-3 and -4 receptors recently reported in other biologically aggressive epithelial human tumors, such breast, prostate, lung, endometrial, thyroid and pancreatic cancer [20,23-25] provide further evidence to suggest that CPE peptide may have great potential for diagnostic and/or radiometabolic therapy of ovarian carcinomas as well as other aggressive human tumors after labeling with suitable chemotherapeutics, radionuclides or toxins. This evidence concerns the gene CLDN3 and familial pancreatic carcinoma.