AIM:To clarify the association between Helicobacter pylori(H.pylori)infection and the risk of esophageal carcinoma through a meta-analysis of published data.METHODS:Studies which reported the association between H.pyl...AIM:To clarify the association between Helicobacter pylori(H.pylori)infection and the risk of esophageal carcinoma through a meta-analysis of published data.METHODS:Studies which reported the association between H.pylori infection and esophageal cancer published up to June 2013 were included.The odds ratios(ORs)and corresponding 95%CIs of H.pyloriinfection on esophageal cancer with respect to health control groups were evaluated.Data were extracted independently by two investigators and discrepancies were resolved by discussion with a third investigator.The statistical software,STATA(version 12.0),was applied to investigate heterogeneity among individual studies and to summarize the studies.A meta-analysis was performed using a fixed-effect or random-effect method,depending on the absence or presence of significant heterogeneity.RESULTS:No significant association between H.pylori infection and esophageal squamous cell carcinoma(ESCC)risk was found in the pooled overall population(OR=0.97,95%CI:0.76-1.24).However,significant associations between H.pylori infection and ESCC risk were found in Eastern subjects(OR=0.66,95%CI:0.43-0.89).Similarly,cytotoxin-associated gene-A(CagA)positive strains of infection may decrease the risk of ESCC in Eastern subjects(OR=0.77,95%CI:0.65-0.92),however,these associations were not statistically significant in Western subjects(OR=1.26,95%CI:0.97-1.63).For esophageal adenocarcinoma(EAC)the summary OR for H.pylori infection and CagA positive strains of infection were 0.59(95%CI:0.51-0.68)and 0.56(95%CI:0.45-0.70),respectively.CONCLUSION:H.pylori infection is associated with a decreased risk of ESCC in Eastern populations and a decreased risk of EAC in the overall population.展开更多
MicroRNAs(miRNAs) are small non-coding RNAs that regulate gene expression at the transcriptional or posttranscriptional level.Many miRNAs are found to play a significant role in cancer development either as tumor supp...MicroRNAs(miRNAs) are small non-coding RNAs that regulate gene expression at the transcriptional or posttranscriptional level.Many miRNAs are found to play a significant role in cancer development either as tumor suppressor genes or as oncogenes.Examination of tumor-specific miRNA expression profiles in diverse cancers has revealed widespread deregulation of these molecules,whose loss and overexpression respectively have diagnostic and prognostic significance.Genetic variations,mostly single-nucleotide polymorphisms(SNPs) within miRNA sequences or their target sites,have been found to be associated with many kinds of cancers.In this review,we summarize the current knowledge of miRNAs including their biogenesis and role in cancer development,and finally,how SNPs among miRNAs affect miRNA biogenesis and contribute to cancer.展开更多
基金Supported by China Postdoctoral Science Foundation,No.2012M521189Zhejiang Provincial Postdoctoral Science Foundation,No.Bsh1202064+2 种基金National Natural Science Foundation ofChina,No.81172081Zhejiang Provincial Natural Science Foundation,No.LY13H160024Wu Jieping Medical Foundation,No.2011,3206750.11059 and 11091
文摘AIM:To clarify the association between Helicobacter pylori(H.pylori)infection and the risk of esophageal carcinoma through a meta-analysis of published data.METHODS:Studies which reported the association between H.pylori infection and esophageal cancer published up to June 2013 were included.The odds ratios(ORs)and corresponding 95%CIs of H.pyloriinfection on esophageal cancer with respect to health control groups were evaluated.Data were extracted independently by two investigators and discrepancies were resolved by discussion with a third investigator.The statistical software,STATA(version 12.0),was applied to investigate heterogeneity among individual studies and to summarize the studies.A meta-analysis was performed using a fixed-effect or random-effect method,depending on the absence or presence of significant heterogeneity.RESULTS:No significant association between H.pylori infection and esophageal squamous cell carcinoma(ESCC)risk was found in the pooled overall population(OR=0.97,95%CI:0.76-1.24).However,significant associations between H.pylori infection and ESCC risk were found in Eastern subjects(OR=0.66,95%CI:0.43-0.89).Similarly,cytotoxin-associated gene-A(CagA)positive strains of infection may decrease the risk of ESCC in Eastern subjects(OR=0.77,95%CI:0.65-0.92),however,these associations were not statistically significant in Western subjects(OR=1.26,95%CI:0.97-1.63).For esophageal adenocarcinoma(EAC)the summary OR for H.pylori infection and CagA positive strains of infection were 0.59(95%CI:0.51-0.68)and 0.56(95%CI:0.45-0.70),respectively.CONCLUSION:H.pylori infection is associated with a decreased risk of ESCC in Eastern populations and a decreased risk of EAC in the overall population.
基金supported by grants from the National Natural Science Foundation of China to K.C.(No.30872172)the Tianjin Science and Technology Committee Foundation(No.08ZCGH202000,09ZCZDSF04400)
文摘MicroRNAs(miRNAs) are small non-coding RNAs that regulate gene expression at the transcriptional or posttranscriptional level.Many miRNAs are found to play a significant role in cancer development either as tumor suppressor genes or as oncogenes.Examination of tumor-specific miRNA expression profiles in diverse cancers has revealed widespread deregulation of these molecules,whose loss and overexpression respectively have diagnostic and prognostic significance.Genetic variations,mostly single-nucleotide polymorphisms(SNPs) within miRNA sequences or their target sites,have been found to be associated with many kinds of cancers.In this review,we summarize the current knowledge of miRNAs including their biogenesis and role in cancer development,and finally,how SNPs among miRNAs affect miRNA biogenesis and contribute to cancer.
