ObjectiveTo determine the level of CDH1 gene promoter hypermethylation in human gastric carcinoma by establishing MS-PCR method, and analyze retrospectively the possible statistical relationship between CDH1 gene promoter hypermethylation in human gastric carcinoma and HP infection, tumor differentiation, invasion, lymph nodal and distant metastasis, respectively. MethodsThe bisulfite conversion MS-PCR method was adopted to examine the level of CDH1 gene promoter hypermethylation in 40 cases of human gastric carcinoma tissue collected between January 2008 and December 2009. The statistical relationship between CDH1 gene promoter hypermethylation in human gastric carcinoma and HP infection, tumor differentiation, invasion, lymph nodal and distant metastasis were examined respectively with SPSS statistical tools. ResultsThe positive rate of CDH1 gene promoter hypermethylation in gastric carcinomas (67.5%) was higher than that in paired normal gastric mucosae (12.5%), and the difference was significant (P<0.05). In gastric carcinomas, the positive rate of CDH1 gene promoter hypermethylation in well differentiated or moderately differentiated groups (22.2%) was lower than that in poorly differentiated groups (80.6%), and the difference was significant (P<0.05). The positive rate of CDH1 gene promoter hypermethylation in HP positive groups (78.1%) was higher than that in HP negative groups (25.0%), and the difference was significant (P<0.05). ConclusionCDH1 gene promoter hypermethylation may play an important role in the process of tumor carcinogenesis in gastric carcinomas. Meanwhile, the CDH1 gene promoter hypermethylation may lead to poor differentiation in gastric carcinomas. CDH1 gene promoter hypermethylation is related to HP infection in the original gastric carcinomas, which shows that HP may get involved in the process of tumor suppressor gene methylation/inactivation and tumor development process.
ObjectiveTo explore the clinical application of electronic crossmatch technique in the preparation of blood in operation. MethodsBetween January 2012 and December 2012, in the donor and the application operation preparation of blood in patients with ABO/RhD, blood type was detected and antibody was screened. The donors with correct blood type and negative antibody and the patients with accordant results of two blood identification and negative antibody underwent electronic cross-matching by electronic cross-matching rules, and completed the blood preparation program. At the same time, the patients underwent traditional blood cross-matching method for preparation to ensure the blood compatibility and to compare the advantages and disadvantages of the two kinds of preparing methods. ResultsIn 7721 blood samples, 7647 samples matched the electronic cross-matching rules; no incompatibility of ABO/RhD was found using electronic cross-matching by computer system. Also, no incompatibility was found using cross-matching by traditional serum method in 7647 blood samples; the average time was 10 minutes, while 100% occupation of blood preparation for operation was found. ConclusionElectronic cross-matching techniques for preparing operation can save manpower and material resources, and also may optimize the operation process, improve the work efficiency and the safety of blood transfusion.