6[1]Isalah J Filder. Tumor heterogeneity and biology of cancer invasion and metatasis[J]. Cancer Res, 1978, 38,2 651 -2 660.
7[2]Magne Bryne, Per S Thrane, Erik Dabelsteen. Loss of expression of blood antigen H is associated with cellular invasion and spread of oral squamous cell ca rcinomas[J]. Cancer, 1991,67,617-618.
8[3]Isaiah J Fidler. Critical factors in the biology of human cancer metstasis:yweety-eighth G. H. A. clows menorial award lectuve[J]. Cancer Res ,1990,(50) :6 130-6 138.
9[4]Gloria H Hheppner. Tumor heterogeity[J]. Cancer Res, 1984,44:2 259-2 265.
10[6]Bryne M, Thrane Dabelsteen E. Loss of blood groop antigen his associated with cellular invasion and spread of oral squamous cell carcinoma[J]. Cancer,1991,67:618-623.