title: The absence of a B allele in acquired B blood group phenotype confirmed by a DNA based genotyping method.
abstract: A case of an 87 year old woman with carcinomatous sigmoid colon, found to be of group A1 with acquired B status, is reported. The acquired B phenotype was confirmed by the absence of a B allele in the patient using denaturing gradient gel electrophoresis of a DNA fragment amplified from the ABO locus by the polymerase chain reaction.
authors.affiliation: Department of Health Science, Hong Kong Polytechnic University, Kowloon.
authors.forename: S P
authors.initials: SP
authors.lastname: Yip
authors.forename: W L
authors.initials: WL
authors.lastname: Choy
authors.forename: C W
authors.initials: CW
authors.lastname: Chan
authors.forename: C H
authors.initials: CH
authors.lastname: Choi
mesh_terms: D000017:ABO Blood-Group System / Q000235:genetics*; D000368:Aged; D000369:Aged, 80 and over; D000483:Alleles; D005260:Female; D005838:Genotype; D006801:Humans; D010641:Phenotype; D016133:Polymerase Chain Reaction; D012811:Sigmoid Neoplasms / Q000097:blood*
chemical_list: D000017:ABO Blood-Group System