In addition, a higher incidence of various types of carcinomas is observed for blood group A and B individuals compared with blood group O individuals (5, 6, 7, 8, 9,10, 11, 12,13).Transfection of the A or B enzymes??? cDNA or selection of A-positive subpopulations of human colorectal carcinoma cell lines showed that the presence of the A and B antigens was associated with a reduced motility on ma