pylori Virulence Factors Show Trends of Being Positively or Negatively Associated with Patient's Clinical Presentation In our study the frequency of cag E -positive isolates obtained from patients with nonulcer dyspepsia, peptic ulcer dyspepsia, or GC patients was 49.4%, 68.4%, and 88.9%, respectively, but this apparent positive association with more severe disease did not reach statistical significance ( P = 0.198).
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<i>Helicobacter pylori</i> Pathogenicity Factors Related to Gastric Cancer.
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