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Helicobacter. 2013 Oct;18(5):356-62. doi: 10.1111/hel.12051. Epub 2013 Apr 1.

High levels of FOXP3⁺ regulatory T cells in gastric MALT lymphoma predict responsiveness to Helicobacter pylori eradication.

Author information

1
Department of Molecular Pathology, Shinshu University Graduate School of Medicine, Matsumoto, Japan.

Abstract

BACKGROUND:

Although Helicobacter pylori eradication is a first-line treatment of gastric MALT lymphoma, roughly 25% of patients do not respond to treatment. CD4⁺ FOXP3⁺ regulatory T (Treg) cells regulate immune responses in physiological conditions and various inflammatory conditions, including H. pylori-associated diseases. Our goal was to determine how Treg cells affect responsiveness to H. pylori eradication therapy.

MATERIALS AND METHODS:

We performed dual immunohistochemistry for CD4 and FOXP3 to evaluate the prevalence of FOXP3⁺ Treg cells in the stomach of 63 patients with MALT lymphoma and 55 patients with chronic active gastritis. Receiver operating characteristic analysis was carried out to determine the best cut-off point in differentiating H. pylori eradication responders from nonresponders.

RESULTS:

Both the FOXP3⁺/CD4⁺ cell ratio and the absolute number of FOXP3⁺ cells per high-power field in MALT lymphoma were significantly greater in H. pylori eradication responders compared with nonresponders, suggesting that Treg cells function in regression mechanisms of MALT lymphomas. Cut-off points with good sensitivities and specificities were obtained to predict eradication outcome.

CONCLUSIONS:

A high number of Treg cells or a high ratio of Treg cells to the total number of CD4⁺ T cells in gastric MALT lymphoma could predict responsiveness to eradication therapy.

KEYWORDS:

FOXP3; Gastric MALT lymphoma; Helicobacter pylori; eradication responsiveness; regulatory T cell

PMID:
23551894
DOI:
10.1111/hel.12051
[Indexed for MEDLINE]

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