The present invention is related to a DNA comprising a nucleotide sequence encoding a polypeptide represented by SEQ ID NO:1 or SEQ ID NO:2. The DNA according to the present invention is highly expressed in prostatic adenocarcinoma and ovarian carcinoma, and is a cancer-associated gene, so that it is possible to inhibit cancer by blocking the binding of the present protein to its ligand. Accordingly, the present antibody is used not only in the detection of the present protein, but also as an agent for the treatment or prevention of cancers such as prostatic adenocarcinoma and ovarian carcinoma.