1. Department of Tumor Pathology , Faculty of Medical Sciences, University of Fukui, Eiheiji, Fukui 910-1193 , Japan
2. Institute of Biochemical Sciences , National Taiwan University, Taipei 10617 , Taiwan
3. Department of Obstetrics and Gynecology , Faculty of Medical Sciences, University of Fukui, Eiheiji, Fukui 910-1193 , Japan
4. Institute of Biological Chemistry , Academia Sinica, Taipei 11529 , Taiwan
5. Department of Pharmacology , Kansai Medical University, Hirakata, Osaka 573-1010 , Japan