National survey report on the current situations and development requirements of emergency testing / 中华检验医学杂志

Objective:To investigate the current situations and development requirements of emergency testing among secondary and tertiary hospitals in China.Methods:The data were collected from secondary and tertiary hospitals via online questionnaire across 31 provinces in China from February 1 to March 1, 2021. The questionnaire involves various aspects of emergency testing, including area of emergency laboratory, staffs and equipment configuration, inspection items, Turn-around time (TAT), reagents and consumables management, pre-analysis quality control, laboratory information system, critical values management and biosafety, etc.Results:A total of 2 187 questionnaires were obtained, and 1 503 valid questionnaires from 755 secondary hospitals and 748 tertiary hospitals were finally analyzed. The research data showed that daily average number of patients visiting emergency department exceeding 300 person-time in 29.41% (220/748) tertiary hospitals, but that number was less than 100 person-time in 76.69% (579/755) secondary hospitals; daily average emergency tests exceeding 5 000 was reported in 24.47% (183/748) tertiary hospitals, and less than 2 000 was reported in 93.51% (706/755) secondary hospitals; the area of emergency laboratory was less than 100 m 2 in 68.79% (238/346) tertiary hospitals with independent emergency testing laboratory; there were no fixed staffs of emergency testing in 56.02% (842/1 503) hospitals; the biochemical/immunoassay analyzer in 8.65% (130/1 503) hospitals did not have STAT position; one hundred and twenty-six hospitals (8.38%) did not have stock in and stock out record for reagents and consumes materials; the conventional statistical analysis of unqualified specimen was not carried out in 24.62% (370/1 503) hospitals; priority on emergent specimen was not set in 58.62% (881/1 503) hospitals; whole process monitoring function was not equipped in 48.64% (731/1 503) hospitals; there was no conventional communication working mechanism with clinicians on critical value in 7.32% (110/1 503) hospitals; overall, 50.23% (755/1 503) participants did not consider that biosafety risks exist in their emergency testing laboratory. Conclusions:This survey objectively presents the current situations and future development requirements of emergency testing among secondary and tertiary hospitals in China. The survey also reflects that some important process and concepts need to be improved, and extensive attention should be paid by laboratory and hospital administrator, in the area such as communication with clinician, site construction and staff configuration, administration on the priority of emergency testing, administration on the reagent and consumable materials, laboratory informatization construction, laboratory biosafety, and so on.

Circulating tumor cell detection approaching to clinical application / 中华检验医学杂志

As "seeds" of tumor metastasis, circulating tumor cell (CTC) has important clinical application value in early diagnosis, immunotherapy and prognosis evaluation of tumors. With a deep understanding of CTC, its applied research has switched from cell enumeration to the molecular typing and single-cell sequencing. However, the standardization of CTC detection is still at a primary stage, opportunities and challenges coexist. This paper will review the current status and challenges in clinical applications of CTC detection, and make some suggestions for future development.

Circulating tumor cell detection approaching to clinical application / 中华检验医学杂志

As "seeds" of tumor metastasis, circulating tumor cell (CTC) has important clinical application value in early diagnosis, immunotherapy and prognosis evaluation of tumors. With a deep understanding of CTC, its applied research has switched from cell enumeration to the molecular typing and single-cell sequencing. However, the standardization of CTC detection is still at a primary stage, opportunities and challenges coexist. This paper will review the current status and challenges in clinical applications of CTC detection, and make some suggestions for future development.

Application of next generation sequencing technology in personalized medicine of lung cancer / 中华检验医学杂志

Lung cancer is the most common malignant tumor in the world and the leading cause of cancer-related deaths. Like other tumors, lung cancer is heterogeneous in the process of tumor development. A comprehensive understanding of heterogeneity can achieve personalized medicine in the true sense, which is the essence of precision medicine. In recent years, nextgeneration sequencing technology has provided novel and important technical means for precision medicine based on its advantages of high-throughput and multi-target analysis. It plays an increasingly important role in molecular typing, targeted drug selection and prognosis prediction of lung cancer.

Expression differences of serum tumor markers in different molecular subtypes of breast cancer and their correlations with recurrence and metastasis / 临床检验杂志

Objective@#To investigate the expression differences of serum tumor markers, such as CEA, CA125 and CA15-3, in different molecular subtypes of breast cancer and their correlations with recurrence and metastasis. @*Methods@#The medical records and follow-up data from 212 patients with breast cancer were retrospectively analyzed. According to the expression of hormone receptor, breast cancer were divided into four molecular subtypes: Luminal A, Luminal B, Her-2 overexpression and Basal-like. The clinical characteristics and levels of CEA, CA125 and CA15-3 in different molecular subtypes of breast cancer patients before operation were compared, and the factors influencing the recurrence and metastasis of breast cancer were analyzed. @*Results@#There were differences in the expression levels of tumor markers for different molecular subtypes of breast cancer. The expression levels of CA15-3 in patients with Her-2 overexpression were significantly higher than that with Luminal A, Luminal B or Basal-like (χ 2 =7.98,P=0. 04). The differentiation degree of tumor cells in different molecular subtypes of breast cancer was different, and the proportion of low differentiation in the patients with Her-2 overexpression was significantly higher than that with Luminal A, Luminal B or Basal-like (χ 2 =12.42,P=0.006). There was also differences in the recurrence and metastasis of tumor for 4 subtypes of breast cancer, and the highest recurrence and metastasis rate existed in the patients with Her-2 overexpression (F=8.69,P=0.034). The multivariate Cox regression analysis showed that tumor diameter, degree of tissue differentiation and presence or absence of vascular tumor thrombus were independent risk factors for the recurrence and metastasis of breast cancer patients (all P＜0.05). @*Conclusion@#The breast cancer patients with Her-2 overexpression have high levels of CA15-3 and poor prognosis, which suggests that the individualized treatment of breast cancer should be combined with molecular subtyping, tumor markers and related risk factors.

Enhanced effect of immunomagnetic beads on micro-CT scan of the lung adenocarci-noma mouse model / 中国肿瘤临床

Objective:To study the signal enhancement of lung adenocarcinoma nude mice after injection of immunomagnetic bead solution (magnetic beads conjugated with monoclonal antibody NJ001) in micro-CT scan. Methods:The models of lung adenocarcino-ma nude mice were established by injecting SPC-A1-luc cells through the tail vein and were validated by bioluminescence imaging (BLI). The nude mice were divided into three groups: physiological saline group, bare magnetic bead group, and immunomagnetic bead group. Three groups of nude mice were injected with physiological saline, 750 nm bare magnetic bead solution, and immuno-magnetic bead solution via the tail vein every week, and micro-CT scan was taken before and 4 h after injection. Immunohistochemis-try (IHC) was used to detect the expression of antigen SP70 in tumor tissues. Results:The tumor was detected in the immunomagnetic bead group at the fourth week, whereas in the physiological saline and bare magnetic bead groups, the tumor was undetectable until the sixth week. The tumor intensities detected at the sixth week by micro-CT scan in the physiological saline, bare magnetic bead, and immunomagnetic bead groups were 59.05 ± 0.66, 60.69 ± 0.55, and 58.25 ± 0.32 before injection and 60.30 ± 1.83, 61.05 ± 0.68, and 67.41±3.82 after injection, respectively. Compared with the tumor intensities before injection, they significantly increased after injec-tion in the immunomagnetic bead group;the difference was statistically significant (P=0.0079). By contrast, no statistical significance was observed in the tumor intensities before and after injection in the physiological saline and bare magnetic bead groups (P=0.1867 and P=0.3839, respectively). Conclusion:The immunomagnetic beads had enhanced effect on micro-CT scan of lung adenocarcinoma nude mouse models.

Development and Evaluation of a Duplex Real-Time PCR Assay With a Novel Internal Standard for Precise Quantification of Plasma DNA

BACKGROUND: Circulating levels of cell-free DNA increase in many pathologic conditions. However, notable discrepancies in the quantitative analysis of cell-free DNA from a large number of laboratories have become a considerable pitfall, hampering its clinical application. METHODS: We designed a novel recombinant DNA fragment that could be applied as an internal standard in a newly developed and validated duplex real-time PCR assay for the quantitative analysis of total cell-free plasma DNA, which was tested in 5,442 healthy adults and 200 trauma patients. RESULTS: Compared with two traditional methods, this novel assay showed a lower detection limit of 0.1 ng/mL, lower intra- and inter-assay CVs, and higher accuracy in the recovery test. The median plasma DNA concentration of healthy males (20.3 ng/mL, n=3,092) was significantly higher than that of healthy females (16.1 ng/mL, n=2,350) (Mann-Whitney two-sample rank sum test, P<0.0001). The reference intervals of plasma DNA concentration were 0-45.8 ng/mL and 0-52.5 ng/mL for healthy females and males, respectively. The plasma DNA concentrations of the majority of trauma patients (96%) were higher than the upper normal cutoff values and were closely related to the corresponding injury severity scores (R²=0.916, P<0.0001). CONCLUSIONS: This duplex real-time PCR assay with a new internal standard could eliminate variation and allow for more sensitive, repeatable, accurate, and stable quantitative measurements of plasma DNA, showing promising application in clinical diagnosis.

Correlation between Urine HCMV Virus Load and Liver Function Indications among HCMV-Infected Infants / 现代检验医学杂志

Objective To quantifying the urine human cytomegalovirus(HCMV)DNA from the HCMV infection infants and its corresponding liver function indications,and investigate the relationship between their concentrations.Methods The u-rine samples were collected from HCMV infection infants.HCMV DNA was measured by fluorescence quantitative polymer-ase chain reaction (FQ-PCR).Serum ALT,AST,ALP,GGT,T-Bil and D-Bil liver function indications were detected and the positive rate was analyzed,simultaneously.The correlation between the logarithm urine HCMV DNA (log HCMV DNA) concentration and ALT,AST,ALP,GGT,T-Bil and D-Bil were analyzed by Spearman correlation analysis.Results The dis-tribution range ofurine log HCMV DNA in 444 HCMV infection infants was <2.70~7.90;the positive rate of serum ALT, AST,ALP,GGT,T-Bil and D-Bil were 24.8%,59.0%,95.7%,31.1%,16.7% and 16.3%,respectively.The urine log HC-MV DNA was associated with GGT and the correlation coefficient was 0.099 (P < 0.05),but no associated with ALT, AST,ALP,T-Bil and D-Bil.Conclusion The positive rate of liver function indications will rise in HCMV infection infants, the urine log HCMV DNA was associated with GGT,but not associated with other liver function indications.

In vitro expression of the pancreatic cancer specific antigen NJ001 and its clinical significance / 中华检验医学杂志

Objective To detect the changes of the NJ001 specific antigen expression before and after surgery, and evaluate whether the NJ001 specific antigen could be used as a serum biomarker for the diagnosis of pancreatic cancer.Methods With the method of sandwich ELISA, the serum samples from 85 pancreatic cancer patients, 22 pancreatic benign tumor and 40 healthy controls were detected respectively. The results of the NJ001 specific antigen in the serum samples from 85 pancreatic cancer patients were compared with CA19-9 detected by ECLIA.Results The positive rate of NJ001 for the pancreatic cancer group was obviously higher than that for the benign pancreatic tumor and health control groups[50.6%(43/85) vs 18.2%(4/22), χ2 =7.451, P0.05].The positive rate in the group of pancreatic cancer before surgery was higher than that after surgery[50.6%(43/85) vs 23.5%(20/85),χ2=13.341, P<0.05].In addition, the results from 85 pancreatic cancer patients showed the specificity of NJ001 specific antigen was up to 87.1%.Although the positive rate of NJ001 specific antigen for pancreatic cancer was lower than that of CA19-9[50.6%(43/85) vs 75.3%(64/85), χ2 =11.121, P<0.05], it was higher when they combined [ 85.9%( 73/85 ) ] .Conclusions It shows high positive rate of NJ001 specific antigen in the patients of pancreatic cancer in this study, which suggests that NJ001 specific antigen might be a potential valuable biomarker for the diagnosis of pancreatic cancer.

Establishment of internal quality control system for automated hematology analyzer according to ISO 15189 / 国际检验医学杂志

Objective To establish a proper internal quality control(QC) system for the automated hematology analyzer accord‐ing to the corresponding stipulation by ISO15189 :2012 .Methods The high ,normal and low levels of controls offered by the instru‐ment were used to detect 22 items in whole blood cells routine analysis ,draw the Levey‐Jennings chart ,analyze and evaluate the quality control data for each month or each batch .Results A proper QC system was established ,including quality goals setting , new QC target value and standard deviation calculating and the QC rules choosing .In setting the target value for new batch of con‐trol ,MCV ,HCT and MCHC should adopt the mean values of at least 20 values ,while other items could adopt the mean values of 10 values ;the difference of CV values for some items existed in different QC levels ,different brands or different instruments in the same brand .Therefore ,the quality goals and standard deviation for new batch should be set according to different levels and differ‐ent instruments .Due to the QC characteristics and existence of QC chart drift phenomenon ,therefore MCV ,HCT and MCHC should adopt the 13 s and 22 s rules .For the other items ,the 13 s ,22 s and 10x rules were adoted .Conclusion Under the corresponding stipulations of ISO15189 and by combining with the laboratory practical situation ,a set of applicable internal quality control system is established .

Clinical application of quantitative detection of plasma DNA in evaluating the effect of chemotherapy on chronic leukemia / 医学研究生学报

Objective Plasma circulating DNA can be em-ployed in place of bone marrow examination for the auxiliary diagnosis of leukemia.This study aimed to explore the clinical application of the plasma DNA level in evaluating the effect of chemotherapy on chronic leukemia. Methods We collected blood samples from 52 patients with chronic myelogenous leukemia (CML) (33 in the chronic phase, 7 in the acceleration phase, and 12 in the blast phase) , 85 with chron-ic lymphocytic leukemia (CLL) (28 with complete remission, 27 with partial remission, and 30 with no remission), 4 patients with hairy cell leukemia (HCL), and 80 healthy subjects.We simultaneously obtained plasma DNA and recombinant plasmid DNA using the BI-LATEST DNA Kit and examined the human β-actin gene and the level of plasmid DNA by real-time quantitative PCR. Results Before chemotherapy, the median value of plasma DNA was 149.46(30.63-496.91)ng/ml in the CML and 101.54(69.10-258.14) ng/ml in the CLL patients, both significantly higher than in the healthy controls (19.05[12.67-25.92]ng/ml) (P<0.01).After chemotherapy, the plasma DNA level of the CML patients was remarkably decreased, but still higher than that of the controls ( P<0.01).The CML patients in the chronic phase showed a markedly higher level of plasma DNA (302.89[93.33-541.52]ng/ml) than those in the blast phase (43.19[23.54-70.03]ng/ml) and acceleration phase (28.11[16.21-92.07]ng/ml) (P<0.05).The CLL patients with CR exhibited a significantly lower level of plasma DNA (24.29[14.64-30.74]ng/ml) than those with PR (106.88 [96.23-143.25]ng/ml) and NR (460.73[284.57-653.38〗ng/ml) (P<0.01), but all dramatically higher than that of the healthy controls (P<0.01) Conclusion The quantification of plasma DNA has a clinical application value in evaluating the effect of chemo-therapy on chronic leukemia.

Detection of drug resistance genes in integron of Shigella sonnei from six cities of Jiangsu Province in 2011 / 中华传染病杂志

Objective To investigate the resistance status of different integrons of Shigella sonnei (S.sonnei) and to analyze the distribution of resistant genes in integrons in Jiangsu Province.Methods A total of 32 strains of S.sonnei isolated from six cities of Jiangsu Province in 2011 were collected.The antibiotic susceptibility was tested by disk diffusion method.The molecular homology was analyzed by pulsed field gel electrophoresis (PFGE).The detection and classification of integrons were achieved by analyzing the positive polymerase chain reaction (PCR) products using restriction fragment length polymorphism (RFLP).RFLP and DNA sequencing were used to analyze the resistance genes in integrons.Results Multi-drug resistance (MDR) was detected in 28 (87.5％) S.sonnei strains.The resistant rates to ampicillin,nalidixic acid and tetracycline were highest (87.5％,respectively).However,it was sensitive to norfloxacin.PFGE analysis showed that there were 3 kinds of homologous clones involving 31 strains of the 32 S.sonnei strains.Among them,2,5 and 24 strains had the same clones,respectively.Accordingly,they spread within one,two and five different cities.The detection rates of class 1,class 2 and the atypical class 1 integrons in S.sonnei were 62.5％ (20/32),81.3％ (26/32) and 21.9％ (7/32),respectively,and no class 3 integron was detected.Sequence analysis of class 1 integron variable area revealed that it contained multiple resistant genes (aacA4-cmlA1 and dfrA1-aadA 1) ; dfrA1-sat 1-aadA 1 from class 2 integron and blara-30-aadA 1 from atypical class 1 integron were also identified.Conclusions In 2011,homologous S.sonnei strains spread among different cities in Jiangsu Province.MDR strains are prevalent and integrons are widespread which mediated the emergence of MDR strains.

The significance of protein SP70 detection for differentiating benign and malignant pleural effusion / 中华检验医学杂志

Objective To investigate the diagnostic value of detection of protein SP70 in differentiating benign and malignant pleural effusion.Methods A case-control study was conducted from July 2011 to February 2012.108 cases of pleural effusion from patients with clinically proven lung cancers and 122 cases of benign pleural effusion were collected.SP70 was detected by Sandwich ELISA,while CEA,CYFRA21-1,NSE were measured by electrochemiluminescence immunoassay for comparison.Meanwhile,protein SP70 on exfoliated cells in pleural effusion was detected by direct immunofluorescence,and was compared with the results of HE staining.The differences between the groups were evaluated by the chisquare test Fisher' s exact test.Results Positive rates of SP70,CEA,CYFRA21-1,NSE were 72.2％,58.3％,52.8％ and 30.6％ in malignant pleural effusion,obviously higher than benign pleural effusio (9.8％,13.1％,23.0％ and 19.7％).The specificity of SP70,CEA,CYFRA21-1,NSE were 90.2％,86.9％,77.0％ and 80.3％,NSCLC had significantly higher positive rate than SCLC(74.3％ ＞0.0％,P =0.02 ＜ 0.05),detection of protein SP70 in malignant pleural effusion had significantly higher coincidence rate than HE staining(72.2％ vs 47.2％,x2 =14.03,P ＜ 0.05).Conclusion Determination of the protein SP70 in pleural effusion and in exfoliated cells,can improve the sensitivity and specificity of the diagnosis of malignant pleural effusion.

A preliminary study on serum protein SP70 as a novel biomarker for the detection of non-small cell lung cancer / 中华检验医学杂志

Objective To evaluate whether the protein SP70 could be used as a serum biomarker for the diagnosis of non-small cell lung cancer (NSCLC).Methods Polyclonal antibody was prepared by immunizing New Zealand rabbit with SPC-A1 cells.Sandwich ELISA was carried out by using newly-prepared polyclonal antibody(PcMb) coating assay plates,monoclonal antibody (McAb) NJ001 and HRP goat antimouse antibody as primary antibody and labeling antibody respectively.After optimizing the experiment conditions,serum from 175 lung cancer patients [ 80 NSCLC adenocarcinoma,70 NSCLC squamous carcinoma and 25 small cell lung cancer ( SCLC) ],25 benign lung disease ( BLD) patients and 300 healthy controls (HC) were examined.CEA,NSE,CYFRA21-1 were measured by ECLIA for comparison.Results Positive rates of NSCLC adenocarcinoma,NSCLC squamous carcinoma,SCLC and BLD were 68.8％,51.4％,16.0％ and 12.0％ respectively,obviously higher than that of HC (7.3％).NSCLC (adenocarcinoma,Squamous carcinoma) had significantly higher positive rate than SCLC (60.7％ υs 16.0％,x2 =17.23,P＜0.05)and BLD(60.7％ υs 12.0％,x2 =20.41,P ＜0.05).Among 68 NSCLC patients who had definite staging,positive rates at early stage ( Ⅰ/Ⅱ,n=30) reached up to 76.7％.Meanwhile,positive rates of CEA,NSE and CYFRA21-1 (32.7％,18.0％ and 37.3％) were significantly lower than the targeting antigen to McAb NJ001 in NSCLC(60.7％ υs 32.7％,x2 =23.63,P ＜0.05;60.7％υs18.0％,x2 =57.22,P＜0.05;60.7％ υs37.3％,x2=16.34,P＜0.05).Conclusions It showed high positive rates of SP70 in the serum of NSCLC patients,which suggested thai SP70 might be a potential valuable biomarker for the diagnosis of NSCLC.

Antimicrobial susceptibility surveillance in China: a MOHNARIN program report (2009-2010) / 中华检验医学杂志

Objective To investigate the bacterial resistance in nationwide and understand the distribution of bacterial and resistance trend.MethodsThe 6507 clinical isolates were collected from 19 hospitals in 17 cities.The susceptibility tests were performed using agar dilution method recommended by Clinical and Laboratory Standards Institute (CLSI) in central laboratory.The values of MIC50,MIC90 and MICrange were calculated by SPSS 17.0 and the susceptibilities of isolates to antimicrobial agents were determined by using CLSI (2010) guideline.Of all 6507 isolates,4691 strains were collected from target wards and 1816 were isolated from others wards.ResultsAmong 4691 strains,1156 were Gram-positive (24.6％ ) and 3535 were Gram-negative (75.4％).Based on the minimum inhibitory concentration results,the prevalence of methicillin resistant Stapylococcus aureus and methicillin resistant Stapylococcus epidermidis are 51.6％ ( 325/630 ) and 87.0％ ( 228/262 ) respectively.Staphylococci showing intermediate or full resistance to vancomycin were not observed. Coagulase negative Staphylococci showed 2.5％ (16/642)intermediate rate and 1.6％ ( 10/642 ) full resistance rate to teicoplanin,and showed 0.5％ ( 3/642 )resistance rate to linezolid.Antibiotic resistance rate of Enterococcus faecalis to ampicillin was 17.1％(19/111),while the resistance rate of Enterococcus faecium to ampicillin reached up to 85.0％(164/193).Three Enterococcus faecium were resistant to glycopeptides.The prevalence of penicillin resistance Streptococcus pneumoniae and penicillin intermediate Streptococcus pneumoniae were 41.2％ ( 145/352) and 37.2％ (131/352) respectively based on oral penicillin criterion,while the prevalence were 0.0％ (0/352) and 6.0％(21/352) based on vein to non-meningitis criterion.A vast majority of Enterobacteriaceae maintained high susceptibility to carbapenems,with resistance rate less than 2.0％.In addition,tigecycline,moxalactam,fosfomycin and amikacin displayed desirable antibacterial activity against Enterbacteriaceae,and resistance rates to these drugs were all less than 10.0％.For non-fermenting Gramnegative isolates,resistance rate of Pseudomonas aeruginosa and Acinetobacter baumannii to imipenem were 23.1％ ( 139/601 ) and 53.5％ (419/784) respectively.Resistance rate of Acinetobacter baumannii was much higher than that during the period 2007 - 2008.Colistin,tigecycline,minocycline and fosfomycin demonstrated good antibacterial activity against Acinetobacter baumannii in vitro.Conclusions Compared with MOHNARIN 2007 -2008year surveillance results, significant increase in resistance rate of Acinetobacter baumannii was demonstrated.Resistant strains to linezolid and tigecycline were found.Bacterial resistance has been a widespread problem in our country,which requires much more attention.

Distribution and drug resistance of major pathogens for urinary tract infections / 中华临床感染病杂志

Objective To investigate the distribution and drug resistance of major pathogens for urinary tract infections in the First Affiliated Hospital of Nanjing Medical University.Methods Strains from midstream urine culture of patients with urinary tract infections were collected during January 1 and December 31,2011.All strains were identified by API system,and disk diffusion method was used for drug sensitivity test.Results Totally 1129 strains were isolated,in which 667 (59.1％ ) were Gram-negative strains,266 (23.5％) were Gram-positive strains,and 196 (17.4) were Candida.Among Gram-negative strains,Escherichia coli,Klebsiella pneumoniae and Proteus mirabilis were highly sensitive to carbapenem antibiotics; while Acinetobacter baumannii and Pseudomonas aeruginosa were highly resistant to most antibiotics including cephalosporins and penicillinase inhibitor,and the resistance rates were over 50％.Among Gram-positive strains,the major strains Enterococcus avium and Enterococcusfaecalis were completely sensitive to vancomycin and teicoplanin,and highly sensitive to linezolid (resistance rate below 10％ ).Candida albicans and Candida glabrata were highly resistant to voriconazole and fluconazole (with the resistance rates of 47.2％ - 60.0％ ), but were completely sensitive to amphotericin and nystatin.Conclusion Gram-negative strains account for most urinary tract infections in the First Affiliated Hospital of Nanjing Medical University with high drug resistance rates.

Clinical significance of peripheral blood circular DNA level measurements in patients with acute myocardial infarction / 中国医疗器械杂志

<p><b>OBJECTIVE</b>To explore clinical value of circular DNA in acute myocardial infarction.</p><p><b>METHODS</b>Venous blood (2 ml/head) of 40 healthy control and 40 patients with acute myocardial infarction within 48h of onset of illness and convalescent period was collected. The level of plasma circular DNA was detected by duplex real-time polymerase chain reaction assay. The levels of myocardial enzyme spectrum and cardiac troponin T (cTnT) were detected by biochemistry method.</p><p><b>RESULTS</b>The level of circular DNA in control group and group of acute myocardial infarction before treatment was (21.5 +/- 10.7) ng/ml and (253.6 +/- 45.7) ng/ml, respectively (P = 0.000). The levels of serum myocardial enzyme spectrum and cTnT before treatment in patients with acute myocardial infarction were significantly higher than those of control group (P < 0.05). The level of circular DNA after treatment in patients with acute myocardial infarction was significantly decreased compared with that before treatment (P = 0.000), the levels of myocardial enzyme spectrum and cTnT were also significantly reduced (P < 0.05). There was significant correlation between the level of circular DNA and those of CK-MB and cTnT, r = 0.613, 0.654, P = 0.032, 0.021.</p><p><b>CONCLUSION</b>Circular DNA can be used as a marker of sensitively reflecting myocardial cell injury.</p>

Serum 25-hydroxy vitamin D status in the second-trimester women in winter / 中华临床营养杂志

ObjectiveTo investigate the serum concentration of 25-hydroxy vitamin D [25(OH)D] in the second-trimester women in winter and explore its correlation with age and blood hemoglobin level. Methods The blood samples of 78 second-trimester women were collected during the 24-28 gestational weeks. Serum 25 (OH) D and blood hemoglobin levels were measured. The correlations of serum 25 (OH) D with age and blood hemoglobin levels were analyzed by Pearson correlation. ResultsOf the 78 pregnant women, the rates of vitamin D deficiency ( ≤25.0 nmol/L), insufficiency [25.0 nmol/L ＜ 25(OH) D≤50.0 nmol/L], and sufficiency were 65.38％, 30.77％, and 3.85％, respectively. Serum concentration of 25 (OH) D was positively correlated with blood hemoglobin level ( r =0.2746, P =0.015 ). ConclusionVitamin D deficiency or insufficiency is common among the second-trimester women in winter, especially among those with low hemoglobin level.

Study of quantitative detection of circulating DNA in the plasma of patients with cervical lesion / 中华妇产科杂志

Objective To quantitatively detect circulating DNA levels in the plasma of patients withcervical lesion and to determine the value for diagnosis of cervical lesion and cervical cancer . Methods Preoperative blood samples were collected from 53 cases of low-grade lesions, 49 cases of high-grade lesions, 44 cases of cervical invasive cancer and 70 cases of healthy women. Plasma DNA was extracted by magnetic bead method (BILATEST DNA kit). The quantity of plasma DNA was determined by duplex real-time quantitative PCR. Results Median plasma DNA level of invasive cervical cancer patients was 61. 59 mg/L (32. 06 - 162. 16 mg/L) , which was significantly higher than that of healthy women [16. 35 mg/L(11. 98 -22.71 mg/L), P 0. 05). Median plasma DNA level of stage I patients was lower than that of stage Ⅱ- Ⅲ patients (46. 02 versus 71. 35 mg/L, P <0. 05). Conclusion Quantitatively detecting plasma circulating DNA may be with some application prospect in the diagnosis of cervical diseases.

Research and development of medical case database: a novel medical case information system integrating with biospecimen management / 生物医学工程学杂志

To meet the needs of management of medical case information and biospecimen simultaneously, we developed a novel medical case information system integrating with biospecimen management. The database established by MS SQL Server 2000 covered, basic information, clinical diagnosis, imaging diagnosis, pathological diagnosis and clinical treatment of patient; physicochemical property, inventory management and laboratory analysis of biospecimen; users log and data maintenance. The client application developed by Visual C++ 6.0 was used to implement medical case and biospecimen management, which was based on Client/Server model. This system can perform input, browse, inquest, summary of case and related biospecimen information, and can automatically synthesize case-records based on the database. Management of not only a long-term follow-up on individual, but also of grouped cases organized according to the aim of research can be achieved by the system. This system can improve the efficiency and quality of clinical researches while biospecimens are used coordinately. It realizes synthesized and dynamic management of medical case and biospecimen, which may be considered as a new management platform.