7Dabelsteen E, Gao S, Den R. ABO blood-group antrigens in oral cancer. J of Dental Research,2005,84( 1 ) :21-28.
8Akira Y,Takashi K, Vibha D, et al. Suppressed expression of blood group B antigen and blood group garactosyltransferase in a preleu- kemic subject. Blood, 1985,66 (4) :990-992.