Research Report
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World J Gastroenterol. Jun 7, 2014; 20(21): 6547-6553
Published online Jun 7, 2014. doi: 10.3748/wjg.v20.i21.6547
Dual-priming oligonucleotide-based multiplex PCR using tissue samples in rapid urease test in the detection of Helicobacter pylori infection
Woo Chul Chung, Sung Hoon Jung, Jung Hwan Oh, Tae Ho Kim, Dae Young Cheung, Byung Wook Kim, Sung Soo Kim, Jin Il Kim, Eun Young Sin
Woo Chul Chung, Sung Hoon Jung, Jung Hwan Oh, Tae Ho Kim, Dae Young Cheung, Byung Wook Kim, Sung Soo Kim, Jin Il Kim, Department of Internal Medicine, the Catholic University of Korea, Seoul 130-709, South Korea
Eun Young Sin, The Research Institute of St. Vincent Hospital, the Catholic University of Korea, Suwon 442-723, South Korea
Author contributions: Chung WC and Jung SH designed the study, drafted and revised the manuscript, and approved the final version of the manuscript; Oh JH, Kim TH, Cheung DY and Sin EY collected and analyzed data; Kim BW, Kim SS and Kim JI supervised the study, and extensively revised the manuscript.
Supported by Research grant from Jeil Pharma.Co., Seoul, South Korea
Correspondence to: Sung Hoon Jung, MD, Department of Internal Medicine, the Catholic University of Korea, St. Paul’s Hospital, 180 Wangsan-ro, Dongdaemun-gu, Seoul 130-709, South Korea. shjung74@catholic.ac.kr
Telephone: +82-2-9582114 Fax: +82-2-9687250
Received: July 18, 2013
Revised: December 13, 2013
Accepted: January 8, 2014
Published online: June 7, 2014
Abstract

AIM: To investigate whether tissue samples processed by the rapid urease test (RUT) kit are suitable for dual-priming oligonucleotide-based multiplex polymerase chain reaction (DPO-PCR) to detect Helicobacter pylori (H. pylori).

METHODS: A total of 54 patients with specific gastrointestinal symptom were enrolled in this study. During endoscopy, gastric biopsy specimens were taken for histology, RUT, and DPO-PCR. DPO-PCR was performed on gastric biopsy samples and tissue samples that were analyzed by RUT at 2 separate institutes. In detecting H. pylori, the concordance rate of the DPO-PCR tests between the tissue samples that had been submitted to RUT and the gastric biopsy samples was investigated.

RESULTS: H. pylori co-occurred with 76.0% (19/25) of gastric ulcers, 64.3% (9/14) of duodenal ulcers, and 33.3% (4/12) of gastritis cases. H. pylori infection was found in 100% (3/3) of the patients with both gastric and duodenal ulcers. Overall, H. pylori was detected in 35 of 54 (64.8%) patients. The diagnostic sensitivities of histology, RUT, and DPO-PCR were 85.7% (30/35), 74.3% (26/35), and 97.1% (34/35), respectively (P = 0.02). The positive predictive value (PPV) of DPO-PCR was 94.4%, whereas the negative predictive value (NPV) was 94.7%. In the rapid urease test (CLOtest)-negative cases, the frequency of positive DPO-PCR and histologic results was 20.0% (7/35). The concordance rate of the DPO-PCR tests between the tissue samples from the RUT kit and the gastric biopsy samples was 94.4% (51/54). The rate of DPO-PCR and silver stain positivity in the RUT-negative cases was 20.0% (7/35).

CONCLUSION: In diagnosing H. pylori infection, DPO-PCR can be performed on tissue samples that have been processed by the RUT kit. Particularly, in patients with RUT-negative results, DPO-PCR on these tissue samples could be helpful in detecting of H. pylori infection.

Keywords: Helicobacter pylori, Diagnosis, Dual-priming oligonucleotide-based multiplex polymerase chain reaction

Core tip: The rapid urease test (CLOtest) alone is unreliable in diagnosing Helicobacter pylori (H. pylori) infection and does not provide information about resistance to clarithromycin. Therefore, we investigated whether tissue samples that have been analyzed by the CLOtest kit are suitable for dual-priming oligonucleotide-based multiplex PCR (DPO-PCR) to detect H. pylori. Our results demonstrated that the DPO-based multiplex PCR test using tissue samples processed by the CLO kit is appropriate for detecting H. pylori and clarithromycin resistance. Particularly, in patients with CLO-negative results, this method is helpful for diagnosing H. pylori infection. Moreover, it would be beneficial in economical aspects.