Carcinogenic Helicobacter pylori in gastric pre-cancer and cancer lesions: Association with tobacco-chewing

Arvind Pandey, Satyendra Chandra Tripathi, Sutapa Mahata, Kanchan Vishnoi, Shirish Shukla, Sri Prakash Misra, Vatsala Misra, Suresh Hedau, Ravi Mehrotra, Manisha Dwivedi, Alok C. Bharti

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


Aim: To investigate the low gastric cancer incidence rate relative to the highly prevalent Helicobacter pylori (H. pylori) infection; data relevant to H. pylori infection during gastric carcinogenesis in Indian patients is currently lacking. Methods: The present study examines the prevalence of H. pylori infection in DNA derived from 156 endoscopic gastric biopsies of different disease groups that represent gastric pre-cancer [intestinal metaplasia (n = 15), dysplasia (n = 15)], cancer [diffuse adenocarcinoma (n = 44), intestinal adenocarcinoma (n = 21)], and symptomatic but histopathologically-normal controls (n = 61). This was done by generic ureC polymerase chain reaction (PCR) and cagA -specific PCR that could specifically identify the carcinogenic H. pylori strain. Results: Our analysis showed the presence of H. pylori infection in 61% of symptomatic histopathologically- normal individuals, however only 34% of control tissues were harboring the cagA+ H. pylori strain. A similar proportion of H. pylori infection (52%) and cagA (26%) positivity was observed in the tumor tissue of the gastric cancer group. In comparison, H. pylori infection (90%) and cagA positivity (73%) were the highest in gastric pre-cancer lesions. In relation to tobacco and alcohol abuse, H. pylori infection showed an association with tobacco chewing, whereas we did not observe any association between tobacco smoking or alcohol abuse with prevalence of H. pylori infection in the tissue of any of the patient groups studied. Conclusion: High incidence of H. pylori infection and carcinogenic cagA positive strain in pre-cancer lesions during gastric carcinogenesis may be associated

Original languageEnglish (US)
Pages (from-to)6860-6868
Number of pages9
JournalWorld Journal of Gastroenterology
Issue number22
StatePublished - 2014


  • CagA
  • Dysplasia
  • Gastric adenocarcinoma
  • Intestinal metaplasia
  • Tobacco chewing
  • UreC

ASJC Scopus subject areas

  • Gastroenterology


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