ANA 선별 검사가 음성이면 ENA 자가항체 검사는 안해도 되는가?: IIFA에 의한 ANA 선별 검사 결과와 LIA에 의한 Ro60과 Ro52 자가항체 검사 결과의 연관성 분석 (Is there no need to perform an additional ENA antibody test when the ANA screening test is negative? : Association Analysis between the results of ANA screening test by IIFA And those of Ro60 and Ro52)

서지정보

· 발행기관 : 고신대학교(의대) 고신대학교 의과대학 학술지
· 수록지 정보 : 고신대학교 의과대학 학술지 / 22권 / 2호 / 120 ~ 125페이지
· 저자명 : 황현용, 김종국

초록

Background: Differently from a theory, the test results of anti-extractable nuclear antigen antibody (ENA Ab) are sometimes positive when those of antinuclear antibody are negative in the same patient. We performed the association analysis between the result of ANA and that of R060 and Ro52 ENA Abs which are prevalently identified in the laboratory practice.
Methods: From January 2006 to June 2007, a total of 133 patients’ test results of ANA by indirect immunofluorescence assay (IIFA) and 13 ENA Abs by line immunoassay (LIA) were analyzed. The patients were divided into 3 groups depending on the results of Ro antibodies: 1) Ro60 (+)-Ro52 (+), 2) Ro60 (+)-Ro52 (-), 3) Ro60 (-)-Ro52 (+). The associations between the results of IIFA and those of LIA in between the groups were analyzed. The associations between the results of IIFA and those of LIA and the prevalence of ENA Abs were analyzed in the ENA (+) group. The prevalence of ENA Abs in the IIFA (-)-LIA (+) group was analyzed. The distributions of ENA Abs identified in the same patient were analyzed in LIA (+), IIFA (+)-LIA (+), and IIFA (-)-LIA (+) groups.
Results: There were no statistical differences between the results of ANA and those of ENA Abs in between the groups, but significant difference was suspected between the Ro60 (+)-Ro52 (+) and the Ro60 (-)-Ro52 (+) groups (p=0.052). The prevalence of Ro60 and Ro52 were high among 13 ENA Abs identified (18.8% and 24% respectively). Statistically significant association between the results of ANAs and those of Ro60 was observed (p=0.005). The prevalence of Ro52 was highest in the IIFA (-)-LIA (+) group (28.6%). The numbers of ENA Abs identified in the same patient decreased in the IIFA (-)-LIA (+) group.
Conclusion: When the autoimmune diseases associated with Ro52 autoantibody are suspected, an ENA profile test should be performed regardless of the ANA results.

영어초록

Background: Differently from a theory, the test results of anti-extractable nuclear antigen antibody (ENA Ab) are sometimes positive when those of antinuclear antibody are negative in the same patient. We performed the association analysis between the result of ANA and that of R060 and Ro52 ENA Abs which are prevalently identified in the laboratory practice.
Methods: From January 2006 to June 2007, a total of 133 patients’ test results of ANA by indirect immunofluorescence assay (IIFA) and 13 ENA Abs by line immunoassay (LIA) were analyzed. The patients were divided into 3 groups depending on the results of Ro antibodies: 1) Ro60 (+)-Ro52 (+), 2) Ro60 (+)-Ro52 (-), 3) Ro60 (-)-Ro52 (+). The associations between the results of IIFA and those of LIA in between the groups were analyzed. The associations between the results of IIFA and those of LIA and the prevalence of ENA Abs were analyzed in the ENA (+) group. The prevalence of ENA Abs in the IIFA (-)-LIA (+) group was analyzed. The distributions of ENA Abs identified in the same patient were analyzed in LIA (+), IIFA (+)-LIA (+), and IIFA (-)-LIA (+) groups.
Results: There were no statistical differences between the results of ANA and those of ENA Abs in between the groups, but significant difference was suspected between the Ro60 (+)-Ro52 (+) and the Ro60 (-)-Ro52 (+) groups (p=0.052). The prevalence of Ro60 and Ro52 were high among 13 ENA Abs identified (18.8% and 24% respectively). Statistically significant association between the results of ANAs and those of Ro60 was observed (p=0.005). The prevalence of Ro52 was highest in the IIFA (-)-LIA (+) group (28.6%). The numbers of ENA Abs identified in the same patient decreased in the IIFA (-)-LIA (+) group.
Conclusion: When the autoimmune diseases associated with Ro52 autoantibody are suspected, an ENA profile test should be performed regardless of the ANA results.

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