Detection of H.pylori in a Group of Iraqi Patients with Colonic Cancer (Histological and Molecular Study)
Iraqi Postgraduate Medical Journal,
2013, Volume 12, Issue 1, Pages 153-159
H. pylori is a one of the gastrointestinal organism which infects more than half the population of the world. H.pylori had been recognized as a class I human carcinogen by the International Agency for Research on Cancer. Recently H. pylori were detected in the mucosa of normal colon. Certain studies suggested a possible relationship between CagA (Cytotoxin Associated Gene A) positive H.pylori and Colonic Cancer while other studies did not find causal relationship between CagA positive H.pylori and Colonic Cancer.
We studied and isolated H.pylori from at or near by the site of lesion of Colonic Cancer and it is found to assess a possible relationship between CagA positive H.pylori and Colonic Cancer.
PATIENTS AND METHODS:
Study involved 30 patients of colonoscopically and Histopathologicaly determined Colonic Cancer (CC group) compared with patients with normal colon (n=90) as a control group (NC group). Patients divided into <20 years age group, 20-40 years age group and >40 years age group. Endoscopic specimens were tested for Biopsy Urease Test (BUT) and Hematoxylin & Eosin (H&E) method for detection of H. pylori also the detection of CagA mRNA using In Situ Hybridization technique with a biotin labeled probe.
There was 66.7% H.pylori positive in patients with Colonic Cancer (by BUT) and 60% by (H&E) compared to 33.3% (by BUT) and 26.7% (H&E) in patients with normal colon (Control). A comparison between NC&CC groups regarding H.pylori infection using H&E method revealed significant difference (P=0.001).Using In Situ Hybridization technique, there was 66.7% CagA positive H.pylori in CC group in correspondence to 25% in NC group. CagA positive H.pylori infection between CC and NC groups revealed significant difference (P=0.008)
H.pylori detected at or near by the site of lesion of Colonic Cancer. In addition it was found that there is a statistical relationship between CagA positive H.pylori infection and Colonic Cancer which suggested a possible role of CagA positive H.pylori in Colonic Cancer.
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