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      Gastric cancer screening by combined assay for serum anti- Helicobacter pylori IgG antibody and serum pepsinogen levels — “ABC method”

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          Abstract

          The current status of screening for gastric cancer-risk (gastritis A, B, C, D) method using combined assay for serum anti- Helicobacter pylori ( Hp) IgG antibody and serum pepsinogen (PG) levels, “ABC method”, was reviewed and the latest results of our ongoing trial are reported. It was performed using the following strategy: Subjects were classified into 1 of 4 risk groups based on the results of the two serologic tests, anti- Hp IgG antibody titers and the PG I and II levels: Group A [ Hp(−)PG(−)], infection-free subjects; Group B [ Hp(+)PG(−)], chronic atrophic gastritis (CAG) free or mild; Group C [ Hp(+)PG(+)], CAG; Group D [ Hp(−)PG(+)]), severe CAG with extensive intestinal metaplasia. Continuous endoscopic follow-up examinations are required to detect early stages of gastric cancer. Asymptomatic Group A, which accounts for 50–80% of all the subjects may be excluded from the secondary endoscopic examination, from the viewpoint of efficiency. Hp-infected subjects should be administered eradication treatment aimed at the prevention of gastric cancer.

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          Most cited references52

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          Effect of eradication of Helicobacter pylori on incidence of metachronous gastric carcinoma after endoscopic resection of early gastric cancer: an open-label, randomised controlled trial.

          The relation between Helicobacter pylori infection and gastric cancer has been proven in epidemiological studies and animal experiments. Our aim was to investigate the prophylactic effect of H pylori eradication on the development of metachronous gastric carcinoma after endoscopic resection for early gastric cancer. In this multi-centre, open-label, randomised controlled trial, 544 patients with early gastric cancer, either newly diagnosed and planning to have endoscopic treatment or in post-resection follow-up after endoscopic treatment, were randomly assigned to receive an H pylori eradication regimen (n=272) or control (n=272). Randomisation was done by a computer-generated randomisation list and was stratified by whether the patient was newly diagnosed or post-resection. Patients in the eradication group received lansoprazole 30 mg twice daily, amoxicillin 750 mg twice daily, and clarithromycin 200 mg twice daily for a week; those in the control group received standard care, but no treatment for H pylori. Patients were examined endoscopically at 6, 12, 24, and 36 months after allocation. The primary endpoint was diagnosis of new carcinoma at another site in the stomach. Analyses were by intention to treat. This trial is registered with the UMIN Clinical Trials Registry, number UMIN000001169. At 3-year follow-up, metachronous gastric carcinoma had developed in nine patients in the eradication group and 24 in the control group. In the full intention-to-treat population, including all patients irrespective of length of follow-up (272 patients in each group), the odds ratio for metachronous gastric carcinoma was 0.353 (95% CI 0.161-0.775; p=0.009); in the modified intention-to-treat population, including patients with at least one post-randomisation assessment of tumour status and adjusting for loss to follow-up (255 patients in the eradication group, 250 in the control group), the hazard ratio for metachronous gastric carcinoma was 0.339 (95% CI 0.157-0.729; p=0.003). In the eradication group, 19 (7%) patients had diarrhoea and 32 (12%) had soft stools. Prophylactic eradication of H pylori after endoscopic resection of early gastric cancer should be used to prevent the development of metachronous gastric carcinoma. Hiroshima Cancer Seminar Foundation.
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            Oncogenic mechanisms of the Helicobacter pylori CagA protein.

            Infection with strains of Helicobacter pylori that carry the cytotoxin-associated antigen A (cagA) gene is associated with gastric carcinoma. Recent studies have shed light on the mechanism through which the cagA gene product, CagA, elicits pathophysiological actions. CagA is delivered into gastric epithelial cells by the bacterial type IV secretion system, where it deregulates the SHP2 oncoprotein. Intriguingly, CagA is noted for its variation, particularly at the SHP2-binding site, which could affect the potential of different strains of H. pylori to promote gastric carcinogenesis.
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              Predicting the development of gastric cancer from combining Helicobacter pylori antibodies and serum pepsinogen status: a prospective endoscopic cohort study.

              Helicobacter pylori infection and gastric atrophy are both risk factors for gastric cancer. We aimed to elucidate the natural history of gastric cancer development according to H pylori infection and gastric atrophy status. A total of 9293 participants in a mass health appraisal programme were candidates for inclusion in the present prospective cohort study: 6983 subjects revisited the follow up programme. Subjects were classified into four groups according to serological status at initial endoscopy. Group A (n = 3324) had "normal" pepsinogen and were negative for H pylori antibody; group B (n = 2134) had "normal" pepsinogen and were positive for H pylori antibody; group C (n = 1082) had "atrophic" pepsinogen and were positive for H pylori antibody; and group D (n = 443) had "atrophic" pepsinogen and were negative for H pylori antibody. Incidence of gastric cancer was determined by annual endoscopic examination. Mean duration of follow up was 4.7 years and the average number of endoscopic examinations was 5.1. The annual incidence of gastric cancer was 0.04% (95% confidence interval (CI) 0.02-0.09), 0.06% (0.03-0.13), 0.35% (0.23-0.57), and 0.60% (0.34-1.05) in groups A, B, C, and D, respectively. Hazard ratios compared with group A were 1.1 (95% CI 0.4-3.4), 6.0 (2.4-14.5), and 8.2 (3.2-21.5) in groups B, C, and D, respectively. Age, sex, and "group" significantly served as independent valuables by multivariate analysis. The combination of serum pepsinogen and anti-H pylori antibody provides a good predictive marker for the development of gastric cancer.
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                Author and article information

                Journal
                Proc Jpn Acad Ser B Phys Biol Sci
                PJAB
                Proceedings of the Japan Academy. Series B, Physical and Biological Sciences
                The Japan Academy (Tokyo, Japan )
                0386-2208
                1349-2896
                25 July 2011
                : 87
                : 7
                : 405-414
                Affiliations
                [*1 ]Japan Research Foundation of Prediction, Diagnosis and Therapy for Gastric Cancer (JRF PDT GC), Tokyo, Japan.
                Author notes
                []Correspondence should be addressed: K. Miki, Japan Research Foundation of Prediction, Diagnosis and Therapy for Gastric Cancer (JRF PDT GC), 1-17-2-604 Shirokane, Minato-ku, Tokyo 108-0072, Japan (e-mail: mikik@ 123456gastro-health-now.org ).

                (Communicated by Takashi SUGIMURA, M.J.A.)

                Article
                pjab-87-405
                10.2183/pjab.87.405
                3171284
                21785258
                622ef933-09aa-42e4-89ae-87095573c8b5
                © 2011 The Japan Academy

                This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

                History
                : 13 December 2010
                : 13 May 2011
                Categories
                Review

                Life sciences
                gastric cancer,cancer screening,pepsinogen (pg) i, ii,anti-helicobacter pylori (hp) igg antibody,serum pepsinogen test method (pg method),screening for gastric cancer-risk (gastritis a, b, c, d) method (abc method)

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