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KMID : 0603820130190020153
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Journal of Experimental & Biomedical Science
2013 Volume.19 No. 2 p.153 ~ p.157
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Performance of Quantitative Real-Time PCR for Detection of Tuberculosis in Granulomatous Lymphadenitis Using Formalin-Fixed Paraffin-Embedded Tissue
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Jijgee Munkhdelger
Khalilullah Mia-Jan
Lee Dong-Sup
Park Sang-Jung
Kim Sung-Hyun
Choi Yeon-Im
Wang Hye-Young
Jeon Bo-young
Lee Hye-Young
Park Kwang-Hwa
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Abstract
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Although culture is the gold standard method to identify mycobacteria, its use in tuberculous lymphadenitis (TBL) is limited due to formalin fixation of the submitted specimens. We evaluated the performance of quantitative real-time PCR (q-PCR) for Mycobacterium Tuberculosis (MTB) in granulomatous lymphadenitis using formalin-fixed paraffinembedded (FFPE) tissues. From 2000 to 2010, a total number of 117 cases of lymph node samples with granulomatous inflammation which were surgically removed and fixed in formalin were studied. Hematoxylin & Eosin (H&E) and Ziehl-Neelsen-stained (ZN) slides were reviewed. qPCR using Real TB-Taq® was performed for all cases to identify Mycobacterium tuberculosis. Thirteen non-tuberculous lymphadenopathy cases were used as negative control. Cervical lymph nodes were more frequently affected (60%, 70/117) than other sites. ZN stain for acid fast bacilli was positive in 19 (16.24%) cases. qPCR for tuberculosis was positive in 92 (78.63%) cases. Caseous necrosis was found in 103 (88.03%) cases. While the ZN stain and qPCR were both negative in all control cases, the qPCR showed a significantly higher positive rate (78.63% vs. 16.24%) compared to ZN stain in histologically diagnosed TBL. Quantitative real-time PCR proves to be more sensitive than ZN stain for diagnosis of tuberculous lymphadenitis.
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KEYWORD
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Granulomatous lymphadenopathy, Mycobacterium tuberculosis, Real-time polymerase chain reaction
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