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The Korean Journal of Pathology 2010;44(3): 259-266.
doi: https://doi.org/10.4132/KoreanJPathol.2010.44.3.259
Comparison of Various Detection Methods of Mycobacterium Species in Formalin-Fixed Paraffin-Embedded Tissue with Chronic Granulomatous Inflammation.
Hyun Seung Lee, Hyoungnam Lee, Soyoung Im, Yun Su Lee, Kyo Young Lee, Yeong Jin Choi
Department of Hospital Pathology, The Catholic University of Korea College of Medicine, Seoul, Korea. mdyjchoi@catholic.ac.kr
ABSTRACT
BACKGROUND: To determine the most effective method for detecting mycobacteria in formalin- fixed paraffin-embedded (FFPE) tissue, we compared the results of Ziehl-Neelsen stain (ZNS) and mycobacterial culture with those of polymerase chain reaction (PCR) and real-time quantitative PCR (RQ-PCR). METHODS: We analyzed 54 cases diagnosed as chronic granulomatous inflammation. In all cases, ZNS and nested PCR using three different primers, IS6110, Mpb64 and IS6110/Rpobeta were done. RQ-PCR with the IS6110/Rpobeta primer was done in 51 cases. RESULTS: Mycobacteria were identified by ZNS in 15/54 (27.8%) cases. RQ-PCR had the highest sensitivity (80.0%) compared to PCR with IS6110 (73.3%), Mpb64 (60.0%) and IS6110/Rpobeta (73.3%). Specificity was higher in all PCR experiments (79.5-82.1%) than in RQ-PCR (69.4%) experiments. The false negative rate was lowest for RQ-PCR (20.0%) than for PCR with IS6110 (26.7%), Mpb64 (40.0%) and IS6110/Rpobeta (26.7%). The false positive rate was highest for RQ-PCR (30.6%) compared to PCR with IS6110 (20.5%), Mpb64 (17.9%) and IS6110/Rpobeta (20.5%). CONCLUSIONS: RQ-PCR had the highest sensitivity, and the lowest false negative rate, but it also had a higher false positive rate than PCR for detection of mycobacteria in FFPE tissues.
Key Words: Polymerase chain reaction; Stain; Mycobacterium; Granulomatous disease, chronic