Relationship between Helicobacter pylori tyrosine-phosphorylated CagA-related markers and the development of diffuse-type gastric cancers: a case-control study.
OBJECTIVE
Tyrosine phosphorylation of the EPIYA motif in Helicobacter pylori CagA (CagA-P) plays an important role in toxic reaction. Diffuse-type gastric cancer (DGC) has a poor prognosis. We tried to clarify the expression level of CagA-P in DGC patients.


METHODS
We enrolled 42 early-stage DGC patients (DGC group; 20 males, 22 females, mean age 58.2 years) and 42 age- and gender-matched atrophic gastritis (AG) patients (AG group) as controls. We evaluated histological and serological gastritis and examined two markers; the serum titer of anti-CagA-P antibody and CagA-P expression in gastric mucosa.


RESULTS
In the DGC group, we found significantly higher corpus histological gastritis scores for activity, atrophy, and intestinal metaplasia. The titer of anti-CagA-P antibody and CagA-P expression in the corpus were significantly higher in the DGC group, especially in females (p < 0.05). Sixteen patients (38.1%) in the DGC group showed both positive markers, and the odds ratio for DGC occurrence was 4.00 (95% CI = 1.07-14.91), while that for females was 9.00 (95% CI = 1.29-62.97).


CONCLUSIONS
CagA-P plays a role in active corpus gastritis, which may link to DGC carcinogenesis. Clinical quantification of CagA-P-related markers may be useful for the evaluation of DGC risk, especially in females.
Wada
Yoshihiro
Y
Department of Medicine and Molecular Science, Graduate School of Biomedical Sciences, Hiroshima University, Hiroshima, Japan.
Ito
Masanori
M
Takata
Shunsuke
S
Tanaka
Shinji
S
Yoshihara
Masaharu
M
Chayama
Kazuaki
K
D000942:Antigens, Bacterial / Q000378:metabolism*; D001426:Bacterial Proteins / Q000378:metabolism*; D014408:Biomarkers, Tumor / Q000378:metabolism; D016022:Case-Control Studies; D016009:Chi-Square Distribution; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D005756:Gastritis / Q000378:metabolism / Q000382:microbiology / Q000473:pathology; D016481:Helicobacter Infections / Q000378:metabolism* / Q000382:microbiology* / Q000473:pathology; D016480:Helicobacter pylori / Q000378:metabolism*; D006801:Humans; D007150:Immunohistochemistry; D008297:Male; D008875:Middle Aged; D010766:Phosphorylation; D018709:Statistics, Nonparametric; D013274:Stomach Neoplasms / Q000378:metabolism* / Q000382:microbiology* / Q000473:pathology; D014443:Tyrosine
D000942:Antigens, Bacterial; D001426:Bacterial Proteins; D014408:Biomarkers, Tumor; C080866:cagA protein, Helicobacter pylori; D014443:Tyrosine