5Chihara Y, Sugano K, Kobayashi A, et al. Loss of blood group A antigen expression in bladder cancer caused by atlelic loss and/or methylation of the ABO gene[J].Lab Invest, 2005, 85(7): 895-907
6Van Loghem, Doff meier, Vanderhart.Two A antigens with abnormal serologic properties. Vox-Sang[J]. 1957, 2(1): 16-24
7Gold ER,Tovey GH,Benney WE, et al.Changes in the group A antigen in a case of leukaemia[J]. Nature, 1959,183(4665): 892- 893
