Jin Akiyama (1), Sin Hitotumatu (2), Ikuro Sato (3) (1) Tokyo University of Science, 1-3 Kagurazaka, Shinjuku, Tokyo, Japan,
(2) Research Institute of Mathematical Science, University of Kyoto, Kenya,
(3) Department of Pathology, Research Institute, Miyagi Cancer Center, 47-1,
Medeshima-shiote (Azanodayama), Natori-city, Miyagi, Japan