scholarly journals Alterations in Gastric Mucosal Microbiota in Gastric Carcinogenesis: A Systematic Review and Meta-Analysis

2021 ◽  
Vol 8 ◽  
Author(s):  
Yingyun Yang ◽  
Ruoyu Ji ◽  
Xinyu Zhao ◽  
Xinyuan Cao ◽  
Qiang Wang ◽  
...  
Keyword(s):  
Gastric Cancer ◽  
Systematic Review ◽  
Relative Abundance ◽  
Alpha Diversity ◽  
Gastric Carcinogenesis ◽  
Case Control Studies ◽  
Bacterial Phyla ◽  
Cancer Group ◽  
Gastric Microbiota ◽  
Gastric Cancer Group

Background: The gastric microbiota profile alters during gastric carcinogenesis. We aimed to identify the alterations in the alpha diversity and relative abundance of bacterial phyla and genera of gastric microbiota in the development of gastric cancer (GC).Methods: The systematic review was performed based on a published protocol with the registration number CRD42020206973. We searched through PubMed, EMBASE and Cochrane databases, as well as conference proceedings and references of review articles (May 2021) for observational studies reporting either the relative abundance of bacterial phyla or genera, or alpha diversity indexes in both GC and non-cancer groups. Selection of studies and data extraction were performed independently by two researchers, with disagreements resolved through discussion. Risk of bias was assessed using the self-modified Newcastle-Ottawa Scale. Results of random-effects meta-analyses were presented as mean differences (MD).Results: Our systematic review included 751 GC patients and 792 non-cancer patients from 14 case-control studies. Gastric cancer group had fewer operational taxonomic units (OTUs) (MD = −68.52, 95%CI: −126.65 to −10.39) and a lower Simpson index (MD = −0.13, 95%CI: −0.20 to −0.07) compared with non-cancer group. At the phylum level, gastric cancer group had a higher abundance of Firmicutes (MD = 7.11, 95%CI: 1.76 to 12.46). At the genus level, Streptococcus (MD = 3.03, 95%CI: 0.07 to 6.00) and Lactobacillus (MD = 5.15, 95%CI: 1.27 to 9.04) were found to be enriched in GCgroup. The relative abundance of the rest bacterial phyla or genera analyzed in our study did not significantly differ between two groups. Subgroup analyses indicated that the source of samples was the major source of interstudy heterogeneity.Conclusion: This systematic review suggested that gastric microbiota dysbiosis occurred in gastric carcinogenesis, with alpha diversity declined and microbiota composition altered.

Expression and Clinical Significance of Serum Exosomal miR-375 in Patients with Gastric Cancer

2021 ◽  
Vol 7 (5) ◽  
pp. 3896-3904
Author(s):  
Daoting Deng ◽  
Hong Zhang ◽  
Junxi Liu ◽  
Lina Ma ◽  
Xinrui Lei ◽  
...  
Keyword(s):  
Gastric Cancer ◽  
Cancer Patients ◽  
Cox Regression ◽  
Prognostic Significance ◽  
Cox Regression Analysis ◽  
Healthy Group ◽  
Cancer Group ◽  
Kaplan Meier ◽  
Gastric Cancer Patients ◽  
Gastric Cancer Group

To explore exosomal miR-375 expression in gastric cancer patients and its relationship with patient prognosis. A total of 53 patients diagnosed with gastric cancer in our hospital from May 2014 to May 2016 were included as the gastric cancer group, and 46 healthy women who came to our hospital for physical examination during the same period were enrolled as the healthy group. Exosomal miR-375 expression level was detected using qRT-PCR, and the diagnostic performance and prognostic significance of exosomal miR-375 in gastric cancer were explored. The gastric cancer group showed increased exosomal miR-375 expression than the healthy group (P< 0.05); Kaplan-Meier survival analysis exhibited that serum exosomal miR-375 has an AUC of 0.778, sensitivity of 69.57%, and specificity of 75.47%, whereas Cox regression analysis showed that the miR-375 expression in exosomes was an independent risk factor affecting the prognosis of gastric cancer patients (P< 0.05). Patient with gastric cancer showed upregulated miR-375 expression in serum exosomes. Serum exosomal miR-375 was found to has positive sensitivity and specificity in the diagnosis of gastric cancer, which may be associated with poor prognosis of gastric cancer patients.

scholarly journals Association between green tea intake and risk of gastric cancer: a systematic review and dose–response meta-analysis of observational studies

2017 ◽  
Vol 20 (17) ◽  
pp. 3183-3192 ◽  
Author(s):  
Yanhong Huang ◽  
Hongru Chen ◽  
Liang Zhou ◽  
Gaoming Li ◽  
Dali Yi ◽  
...  
Keyword(s):  
Gastric Cancer ◽  
Systematic Review ◽  
High Temperature ◽  
Relative Risk ◽  
Green Tea ◽  
Dose Response ◽  
Observational Studies ◽  
Meta Analysis ◽  
Case Control ◽  
Case Control Studies

AbstractObjectiveTo examine and quantify the potential dose–response relationship between green tea intake and the risk of gastric cancer.DesignWe searched PubMed, EMBASE, Web of Science, CBM, CNKI and VIP up to December 2015 without language restrictions.SettingA systematic review and dose–response meta-analysis of observational studies.SubjectsFive cohort studies and eight case–control studies.ResultsCompared with the lowest level of green tea intake, the pooled relative risk (95 % CI) of gastric cancer was 1·05 (0·90, 1·21, I2=20·3 %) for the cohort studies and the pooled OR (95 % CI) was 0·84 (0·74, 0·95, I2=48·3 %) for the case–control studies. The pooled relative risk of gastric cancer was 0·79 (0·63, 0·97, I2=63·8 %) for intake of 6 cups green tea/d, 0·59 (0·42, 0·82, I2=1·0 %) for 25 years of green tea intake and 7·60 (1·67, 34·60, I2=86·5 %) for drinking very hot green tea.ConclusionsDrinking green tea has a certain preventive effect on reducing the risk of gastric cancer, particularly for long-term and high-dose consumption. Drinking too high-temperature green tea may increase the risk of gastric cancer, but it is still unclear whether high-temperature green tea is a risk factor for gastric cancer. Further studies should be performed to obtain more detailed results, including other gastric cancer risk factors such as smoking and alcohol consumption and the dose of the effective components in green tea, to provide more reliable evidence-based medical references for the relationship between green tea and gastric cancer.

scholarly journals Interdisciplinary insights into the link between gut microbiome and gastric carcinogenesis—what is currently known?

2021 ◽  
Author(s):  
Karolina Kaźmierczak-Siedlecka ◽  
Agnieszka Daca ◽  
Giandomenico Roviello ◽  
Martina Catalano ◽  
Karol Połom
Keyword(s):  
Gastric Cancer ◽  
Gut Microbiome ◽  
Short Chain Fatty Acids ◽  
Gastric Carcinogenesis ◽  
Point Of View ◽  
Molecular Techniques ◽  
Nitroso Compounds ◽  
Gastric Microbiota ◽  
Development Of Gastric Cancer

AbstractCurrently, gastric cancer is one of the leading death-related cancer globally. The etiopathogenesis of gastric cancer is multifactorial and includes among others dysbiotic alterations of gastric microbiota. Molecular techniques revealed that stomach is not a sterile organ and it is resides with ecosystem of microbes. Due to the fact that the role of Helicobacter pylori infection in development of gastric cancer is established and well-studied, this paper is mainly focused on the role of other bacterial as well as viral and fungal gut microbiota imbalance in gastric carcinogenesis. Notably, not only the composition of gastric microbiota may play an important role in development of gastric cancer, but also its activity. Microbial metabolites, such as short-chain fatty acids, polyamines, N-nitroso compounds, and lactate, may significantly affect gastric carcinogenesis. Therefore, this paper discussed aforementioned aspects with the interdisciplinary insights (regarding also immunological point of view) into the association between gut microbiome and gastric carcinogenesis based on up-to-date studies.

scholarly journals Changes in gastric mucosal microbiota in gastric carcinogenesis: a systematic review protocol

BMJ Open ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. e045810
Author(s):  
Ruoyu Ji ◽  
Xinyu Zhao ◽  
Xinyuan Cao ◽  
Yizhen Zhang ◽  
Yingyun Yang
Keyword(s):  
Systematic Review ◽  
Conference Proceedings ◽  
Data Extraction ◽  
Alpha Diversity ◽  
Gastric Carcinogenesis ◽  
Ethical Approval ◽  
Registration Number ◽  
Newcastle Ottawa Scale ◽  
Review Protocol ◽  
Quantitative Analyses

IntroductionThe human stomach is a complex and diverse microbial ecosystem. Consecutive alternations of gastric microbiota occur in gastric carcinogenesis, while the changing pattern during this process remains controversial across studies. We aim to identify the changes in the diversity and composition of gastric mucosal microbiota in gastric tumorigenesis.Methods and analysisWe will search through PubMed, EMBASE and Cochrane databases, as well as conference proceedings and references of review articles for observational articles reporting either the relative abundance of bacteria at the phylum or genus level or at least one of the alpha diversity indexes respectively and clearly in both gastric cancer and non-cancer groups. Selection of studies and data extraction will be performed independently by two researchers. Disagreements will be resolved through discussion. Risk of bias will be assessed using the modified Newcastle-Ottawa Scale. Quantitative analyses will be performed using a random effects model, where the effect measurement will be expressed as the MD.Ethics and disseminationEthical approval for this systematic review is not required, as the study is based exclusively on published documents and will not include any individual data. Findings of this study are expected to be disseminated through peer-reviewed journals or conference proceedings.PROSPERO registration numberCRD42020206973.

Identification of a high risk gastric cancer group using serum pepsinogen after successful eradication ofHelicobacter pylori

2012 ◽  
Vol 28 (1) ◽  
pp. 78-83 ◽  
Author(s):  
Masahira Haneda ◽  
Mototsugu Kato ◽  
Saori Ishigaki ◽  
Mio Suzuki ◽  
Masakazu Takahashi ◽  
...  
Keyword(s):  
Gastric Cancer ◽  
High Risk ◽  
Serum Pepsinogen ◽  
Cancer Group ◽  
Gastric Cancer Group

The effect of CTLA-4 and CD28 gene variants and circulating protein levels in patients with gastric cancer

2017 ◽  
Vol 42 (5) ◽  
Author(s):  
Soykan Arikan ◽  
Alper Gümüş ◽  
Özlem Küçükhüseyin ◽  
Cihan Coşkun ◽  
Saime Turan ◽  
...  
Keyword(s):  
Gastric Cancer ◽  
Cancer Patients ◽  
Control Group ◽  
Protein Levels ◽  
Cancer Group ◽  
Pcr Rflp ◽  
Gastric Cancer Patients ◽  
Turkish Patients ◽  
Circulating Levels ◽  
Gastric Cancer Group

AbstractObjective:Gastric cancer is one of the most common malignancies worldwide. The risk factors for gastric cancer include environmental and genetic factors. Inflammation and the immune system are known to contribute to the development of the gastric cancer. We examined the influence of critical polymorphisms of CTLA-4 and CD28 genes and circulating protein levels on the etiology of gastric cancer.Methods:Genotyping of SNPs was performed in 55 gastric cancer patients and 105 healthy individuals using the PCR-RFLP method, and circulating levels of sCTLA-4 and sCD28 were measured.Results:There were no significant differences in the genotype and allele distributions of the evaluated SNPs [CTLA-4-318 C>T (rs5742909), CTLA-4+49 A>G (rs231775), CD28 C>T (rs3116496)] between gastric cancer patients and controls (p=0.36, p=0.78, and p=0.80, respectively). The circulating levels of sCTLA-4 and sCD28 were significantly different between the gastric cancer group and the control group (p<0.001 and p<0.001, respectively).Conclusion:The present results suggest that the CTLA-4 and CD28 gene polymorphisms that were evaluated do not play an important role in Turkish patients with gastric cancer. However, sCTLA4 and sCD28 levels were higher in cancer patients and may be useful as an auxiliary parameter in the diagnosis and monitoring of gastric cancer.

scholarly journals Alterations in mucosa-associated microbiota in the stomach of patients with gastric cancer

2021 ◽  
Author(s):  
Yilin Deng ◽  
Xuewei Ding ◽  
Qingyuan Song ◽  
Gang Zhao ◽  
Lei Han ◽  
...  
Keyword(s):  
Gastric Cancer ◽  
Cancer Progression ◽  
Chronic Gastritis ◽  
454 Sequencing ◽  
Alpha Diversity ◽  
Sequencing Platform ◽  
Gastric Corpus ◽  
H Pylori ◽  
Gastric Cancer Progression ◽  
Gastric Microbiota

Abstract Purpose The purpose of this study was to characterize alterations in mucosa-associated microbiota in different anatomical locations of the stomach during gastric cancer progression and to identify associations between Helicobacter pylori infection and gastric microbial changes in patients with gastric cancer. Methods Twenty-five H. pylori negative subjects with chronic gastritis and thirty-four subjects with gastric cancer were recruited, including H. pylori negative and positive patients with tumors in the antrum and the corpus. Gastric mucosa-associated microbiota were determined by 16S ribosomal RNA gene sequencing using a 454 sequencing platform. Results We found that individuals with chronic gastritis from three different anatomical sites exhibited different microbiota compositions, although the microbial alpha diversity, richness and beta diversity were similar. Compared to patients with chronic gastritis, the gastric microbiota compositions were significantly different at the order level in the antrum and the corpus of patients with gastric cancer, which was dependent on the H. pylori infection status. Microbial alpha diversity and species richness, however, were similar between chronic gastritis and gastric cancer cases and independent of H. pylori status. The microbial community structure in patients with gastric cancer was distinct from that in patients with chronic gastritis. In addition, we found that the presence of H. pylori markedly altered the structure in gastric corpus cancer, but only mildly affected the antrum. Conclusion Our data revealed distinct niche-specific microbiota alterations during the progression from gastritis to gastric cancer. These alterations may reflect adaptions of the microbiota to the diverse specific environmental habitats in the stomach, and may play an important, as yet undetermined, role in gastric carcinogenesis.

scholarly journals Gastrointestinal Microbiota Changes in Patients With Gastric Precancerous Lesions

2021 ◽  
Vol 11 ◽  
Author(s):  
Dehua Liu ◽  
Si Chen ◽  
Yawen Gou ◽  
Wenyong Yu ◽  
Hangcheng Zhou ◽  
...  
Keyword(s):  
Gastric Cancer ◽  
Precancerous Lesions ◽  
Alpha Diversity ◽  
Intraepithelial Neoplasia ◽  
Rrna Gene ◽  
Gastrointestinal Microbiota ◽  
Microbial Composition ◽  
16S Rrna Gene Analysis ◽  
Gastric Biopsies ◽  
Gastric Microbiota

BackgroundGastric microbiota may be involved in gastric cancer. The relationship between gastrointestinal microbes and the risk of gastric cancer is unclear. This study aimed to explore the gastric and intestinal bacteria associated with gastritis and gastric precancerous lesions. We conducted a case-control study by performing 16S rRNA gene analysis of gastric biopsies, juices, and stool samples from 148 cases with gastritis or gastric precancerous lesions from Anhui and neighboring provinces, China. And we validated our findings in public datasets.ResultsAnalysis of microbial sequences revealed decreased bacterial alpha diversity in gastric bacteria during the progression of gastritis. Helicobacter pylori was the main contributor to the decreased microbial composition and diversity in the gastric mucosa and had little influence on the microbiota of gastric juice and feces. The gastric mucosal genera Gemella, Veillonella, Streptococcus, Actinobacillus, and Hemophilus had the higher degree of centrality across the progression of gastric precancerous lesions. And Acinetobacter may contribute to the occurrence of intraepithelial neoplasia. In addition, the microbial model of H. pylori-positive gastric biopsies and feces showed value in the prediction of gastric precancerous lesions.ConclusionsThis study identified associations between gastric precancerous lesions and gastric microbiota, as well as the changes in intestinal microbiota, and explored their values in the prediction of gastric precancerous lesions.

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