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 with the habit of chewing tobacco.
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. pyloriinfection and carcinogenic cagA positive strain in pre-cancer lesions during gastric carcinogenesis may be associated with the habit of chewing tobacco.
Authors: J F Tomb; O White; A R Kerlavage; R A Clayton; G G Sutton; R D Fleischmann; K A Ketchum; H P Klenk; S Gill; B A Dougherty; K Nelson; J Quackenbush; L Zhou; E F Kirkness; S Peterson; B Loftus; D Richardson; R Dodson; H G Khalak; A Glodek; K McKenney; L M Fitzegerald; N Lee; M D Adams; E K Hickey; D E Berg; J D Gocayne; T R Utterback; J D Peterson; J M Kelley; M D Cotton; J M Weidman; C Fujii; C Bowman; L Watthey; E Wallin; W S Hayes; M Borodovsky; P D Karp; H O Smith; C M Fraser; J C Venter Journal: Nature Date: 1997-08-07 Impact factor: 49.962
Authors: Miguel Santibáñez; Estefanía Aguirre; Sofía Belda; Nuria Aragones; Jesús Saez; Juan Carlos Rodríguez; Antonio Galiana; Javier Sola-Vera; Montserrat Ruiz-García; María Paz-Zulueta; Raquel Sarabia-Lavín; Alicia Brotons; Elena López-Girona; Estefanía Pérez; Carlos Sillero; Gloria Royo Journal: PLoS One Date: 2015-03-20 Impact factor: 3.240