JOURNAL ARTICLE
OBSERVATIONAL STUDY
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IL-35-producing B cells in gastric cancer patients.

A significant characteristic of advanced gastric cancer (GC) is immune suppression, which can promote the progression of GC. Interleukin 35 (IL-35) is an immune-suppressing cytokine, and it is generally recognized that this cytokine is secreted by regulatory T (Treg) cells. Recently, studies have found that IL-35 can also be produced by B cells in mice. However, scientific studies reporting that IL-35 is secreted by B cells in humans, specifically in cancer patients, are very rare.Blood samples were collected from 30 healthy controls (HCs) and 50 untreated GC patients, and IL-35-producing B cells in the peripheral blood were investigated. Moreover, Treg cells (CD4CD25CD127), myeloid-derived suppressor cells (MDSCs) (CD14HLA-DR) and other lymphocyte subsets (CD3, CD4, CD8 T cells, activated and memory CD4 T cells, activated CD8 T cells, CD14 monocytes, and IL-10-producing B cells) were also examined.IL-35-producing B cells were significantly upregulated in patients with advanced GC. Furthermore, the frequency of IL-35-producing B cells was positively correlated with the frequencies of Treg cells (CD4CD25CD127), MDSCs (CD14HLA-DR), IL-10-producing B cells, and CD14 monocytes in these GC patients.In summary, the frequency of IL-35-producing B cells is significantly elevated in advanced GC; this outcome implies that this group of B cells may participate in GC progression.

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