1 Department of Biochemistry, Medical Faculty, Patrice Lumumba Peoples' Friendship University, Moscow, Russian Federation
2 Department of Pathogenetic Mechanisms of Metastasis, R. E. Kavetskii Institute for Problems in Oncology, Academy of Sciences of the Ukrainian SSR, Kiev, Ukraine
3 All-Union Research Institute of Applied Enzymology, Vilnius, Lithuania
4 Department of Biochemistry of Cancer, Center for Adult Pathology, Osaka, Japan