A-kinase anchoring protein 3 (AKAP3) is a sperm protein and its expression appears to be restricted to the testis in normal adult tissues. We investigated AKAP3 mRNA expression in 20 normal ovaries and 54 ovarian cancers of different histological types, grades and stages by reverse transcriptionpolymerase chain reaction (RT-PCR). The PCR products were analyzed by conventional agarose gel electrophoresis and capillary electrophoresis on a microtip device to determine the expression semiquantitatively. Little or no expression was observed in the 20 normal ovarian specimens. High AKAP3 mRNA expression was observed in 15 ovarian cancer specimens (28 %). Ovarian cancer represents the fifth leading cause of death from cancers in women, and the first in gynecological malignancies. 1 Because of difficulties in detection, diagnosis and treatment, the overall survival rate of ovarian cancer patients is still poor. 2,3 It is therefore necessary to overcome these difficulties. Since the discovery of human tumor antigens recognized by T-lymphocytes, 4 immunotherapy has received particular attention as one of the new modalities for cancer therapy. 5 Cancer/testis (CT) antigens, which express only in the testis in normal adult tissues and a variety of cancers, would be potential targets for human cancer vaccination. 6 There are now more than 14 genes or gene families coding for CT antigens, 6,7 e.g., MAGE, SSX, NY-ESO-1/LAGE, SCP-1 and OY-TES-1.A-kinase anchoring proteins (AKAPs) are a group of structurally diverse proteins that bind to the regulatory subunit of protein kinase A (PKA). They localize in discrete sites in a cell and enable PKA to be exposed to cAMP efficiently. 8 Recently, it has been demonstrated that AKAP-mediated PKA activation inhibited cell growth in the muscle 9 and T lymphocytes. 10,11 Paclitaxel, docetaxel and vincristine, which were shown to damage microtubules, also activate PKA and induce hyperphosphorylation of Bcl-2, cause growth arrest and apoptosis. 12,13 Chemotherapy using a paclitaxel-based regimen is now commonly used for the treatment of postoperative ovarian cancer patients. 14,15 In our study, we investigated AKAP3 mRNA expression in normal ovary and ovarian cancer, semiquantitatively using capillary electrophoresis on a microtip. A previous study showed that AKAP3 belonged to sperm proteins and the mRNA expression was observed only in the testis in normal adult tissues. 16 We showed that high AKAP3 mRNA expression was observed in ovarian cancer and the expression was correlated to the histological grade and clinical stage of the tumor. The expression in the normal ovary was only marginal. Thus, AKAP3 appeared to be a cancer/testis (CT) antigen. Furthermore, we investigated the relationship between AKAP3 mRNA expression and prognosis. We showed that AKAP3 mRNA expression was an independent and favorable prognostic factor in patients with poorly differentiated ovarian cancer.
MATERIAL AND METHODS
Patients and specimensFifty-four patients were investigated in our study with a median age of 54 ...