title: [Gene engineering EB virus membrane antigen in detection of MA-IgA antibody--comparison with VCA-IgA and EA-IgA antibodies].
abstract: With gene engineering EB virus membrane antigen as the diagnostic antigen, indirect immunofluorescence (IF) assay was used to detect IgA antibody against EB virus membrane antigen (MA-IgA) in sera from 202 nasopharyngeal carcinoma (NPC) patients and 315 controls (normal and patients with other tumors). MA-IgA antibody was positive in 96.8% of the pre-treatment NPC patients with a GMT of 1:36.3. MA-IgA detection by this method was more sensitive than EA-IgA detection by IE. In contrast, patients with tumors other than NPC were negative for MA-IgA antibody. 9.1% of VCA-IgA positive persons were MA-IgA positive with a GMT of less than 1:5. No MA-IgA positive was found in VCA-IgA negatives. The results indicated that this method was relatively specific. In the treatment group, the positive rate and GMT of MA-IgA antibody declined with increase in survival time and the decline was faster than VCA-IgA. When recurrence or distant metastasis developed, similar to VCA-IgA and EA-IgA antibodies, the positive rate and GMT of MA-IgA antibody increased to its pretreatment level. Therefore, MA-IgA detection might be valuable in the early diagnosis and monitor of NPC.
authors.affiliation: Cancer Hospital, Zhongshan Medical College, Guangzhou.
authors.forename: M Z
authors.initials: MZ
authors.lastname: Liu
mesh_terms: D000818:Animals; D000914:Antibodies, Viral / Q000032:analysis*; D000956:Antigens, Viral / Q000276:immunology*; D002213:Capsid / Q000276:immunology; D036022:Capsid Proteins; D005818:Genetic Engineering; D004854:Herpesvirus 4, Human / Q000276:immunology; D006801:Humans; D007070:Immunoglobulin A / Q000032:analysis*; D009303:Nasopharyngeal Neoplasms / Q000276:immunology*; D014162:Transfection; D014763:Viral Matrix Proteins
chemical_list: D000914:Antibodies, Viral; D000956:Antigens, Viral; D036022:Capsid Proteins; C037662:EBV-associated membrane antigen, Epstein-Barr virus; C041788:Epstein-Barr viral capsid antigen; C033305:Epstein-Barr virus early antigen; D007070:Immunoglobulin A; D014763:Viral Matrix Proteins