title: Deletion of histo-blood group A and B antigens and expression of incompatible A antigen in ovarian cancer.
abstract: Expression of histo-blood group ABH antigens in 53 cases of ovarian cancer was examined by immunoperoxidase staining of Formalin-fixed as well as frozen histological sections with various monoclonal antibodies, including those defining type 1, 2, 3, and 4 chain A. Findings of major interest were (a) deletion of A and B determinants in tumors from histo-blood group A and B individuals, and a high incidence of H antigen deletion in tumors from group O individuals were observed and (b) strong expression of incompatible A antigen in two of 10 samples from group B patients and in two of nine samples from group O patients was demonstrated. A antigen expression was defined by monoclonal antibody AH21, which reacts with monofucosyl type 1 chain A (ALed), but not by other types of anti-A antibodies directed to difucosyl type 1 chain A (ALeb), mono- or difucosyl type 2 chain A, or type 3 or type 4 chain A. The reactivity of monoclonal antibody AH21 was abolished by alpha-N-acetylgalactosaminidase from chicken liver. These findings clearly identified the specific expression of incompatible A antigen with the structure monofucosyl type 1 chain A (ALed) in tumors from histo-blood group B and O individuals.
authors.affiliation: Biomembrane Institute, Seattle, WA 98119.
authors.forename: R
authors.initials: R
authors.lastname: Metoki
authors.forename: K
authors.initials: K
authors.lastname: Kakudo
authors.forename: Y
authors.initials: Y
authors.lastname: Tsuji
authors.forename: N
authors.initials: N
authors.lastname: Teng
authors.forename: H
authors.initials: H
authors.lastname: Clausen
authors.forename: S
authors.initials: S
authors.lastname: Hakomori
mesh_terms: D000017:ABO Blood-Group System / Q000276:immunology*; D005260:Female; D006801:Humans; D007124:Immunoenzyme Techniques; D007519:Isoantigens / Q000032:analysis*; D010051:Ovarian Neoplasms / Q000276:immunology*
chemical_list: D000017:ABO Blood-Group System; D007519:Isoantigens