Background and purpose: Accumulation of genetic and epigenetic changes that lead to the activation of proto-oncogenes or inactivation of tumor suppressor genes play important roles in development and progression of bladder cancer. We aimed to investigate the methylation patterns of TWIST1 gene in bladder cancer. Methods:A total number of 78 histologically conifrmed bladder tumor samples and paired 75 urine samples constituted the study group and was compared with 75 age-matched and gender-matched non-cancerous individuals. DNA was puriifed from both tumor, adjacent tissues and urine samples. The methylation status of the TWIST1 gene was analyzed by methylation-specific polymerase chain reaction (MSP) in both urinary bladder cell carcinoma samples, adjacent tissues and urine samples. Sensitivity and speciifcity values of the method were assessed and compared with the results of the cytology test. Results:Methylation of TWIST1 was detected in 88.5%of carcinoma samples and 84%of the paired urine samples,respectively;11.5%carcinoma adjacent tissues and 5.3%control urine sample was methylated. The sensitivity by urine cytology detection method was 49.3%in in bladder cancer patients, and was 17.3%in control group. The sensitivity of TWIST1 genes was 66.7%for low-grade cases. The sensitivity of urine cytology was 33.3%for the same low-grade cases. Conclusion:The methylation analysis of TWIST1 gene may be a simple, non-invasive, sensitive, and speciifc method for early detecting bladder cancer cells in urine.

Objective To verify the performance of VITROS 5600 automatic biochemical analyzer.Methods According to laboratory accreditation criteria and performance verification documents of American CLIA'88,the precision,accuracy,liner range,clinical reportable range and biological reference interval were verified for the test of 17 conventional biochemical indicators performed on VITROS 5600 automatic biochemical analyzer.Results The precision、accuracy、liner range、clinical reportable range and biological reference interval of VITROS 5600 automatic biochemical analyzer were all acceptable.Conclusion VITROS 5600 automatic biochemical analyzer could fully meet the requirements in clinical application.

Objective To investigate the changes of urine conductivity in common kidney diseases and the relationship between urine conductivity and cystatin C.Methods A total of 723 patients in the First Affiliated Hospital of Dalian Medical University were selected in this study and divided into IgA nephropathy group(81 patients),diabetic nephropathy group(104 patients),ne-phritic syndrome group(130 patients),multiple myeloma group(89 patients),chronic glomerulonephritis group(1 1 5 patients),renal calculus group(101 patients)and chronic renal failure group(103 patients).Other 205 healthy persons were recruited into control group.The urine samples were analyzed by Sysmex automatic urinary sediment analyzer UF 1000i to determine the urine conductivi-ty,while the serum samples were analyzed by Hitachi automatic biochemical analyzer 7600 to determine the cystatin C.All the re-sults were statistically analyzed by SPSS1 9.0 software.Results The urine conductivity in kidney patients was significant lower than that of healthy people (P <0.05).There was a significant negative correlation between urine conductivity and the cystatin C in the kidney patients(P <0.05).Conclusion The urine conductivity might serve as an important index in evaluating the kidney func-tion and urine concentration.

Objective To understand the distribution situation of respiratory viral infection among adult inpatients with respiratory infection in the emergency department.Methods The detection results data of 5 kinds of viruses RSV,IVA,IVB,PIV1,PIV2,PIV3 and ADV by indirect immune fluorescence assay in 384 adults patients with respiratory infection in the emergency department of our hospital from January 2014 to December 2015 were collected.The epidemic characteristics of different viruses were analyzed.Results Among 384 specimens,208 cases were positive in respiratory virus IgM antibody,the viral infection positive rate was 54.17%.The mixed virus infection and influenza B virus infection were most common,their viral positive rates were 26.56% and 23.44% respectively,In the mixed viral infection,the positive rate of IVA + IVB mixed infection was highest,accounting for 87.25%,which was higher than that of other kinds of mixed viral infection.The viral infection positive rate had no statistical difference between different genders(P>0.05).The viral infection rate was higher in autumn and winter,which were 66.06% and 68.37% respectively and higher than 42.31% and 34.25% in spring and summer,the difference was statistically significant(P<0.05).The viral infection rates of youth (18-45 years old) and middle-aged (>45-60 years old) were 64.94% and 63.86% respectively,which were higher than 48.45%,44.92% and 55.56% in pre-elderly (>60-75 years old),elderly (>75-90 years old) and longevous elderly (>90 years old),the differences were statistically significant(P<0.05).Conclusion The respiratory virus mixed infection and IVB infection are most common in the emergency wards,moreover the viral infection situation shows the seasonal and age characteristics,but which is not affected by sex factor.