Objective To investigate expressions of STAT3 and phosphorylated STAT3(p-STAT3)in cutaneous malignant melanoma(CMM)lesions, and to explore their significance. Methods The expressions of STAT3 and p-STAT3 were detected with an immunohistochemical method using polymer enzyme-labeled secondary antibodies in skin specimens from 22 CMM lesions and 23 pigmented nevus lesions. The effects of STAT3 and p-STAT3 expressions on lymph node metastasis of CMM were evaluated. Results The expression rate of STAT3 was significantly higher in CMM lesions than in pigmented nevus lesions (95.5% vs. 56.5%, χ2 = 9.23, P < 0.05), so was that of p-STAT3 (90.9% vs. 43.5%, χ2 =11.38, P < 0.05). STAT3 expression in CMM lesions had no obvious effects on lymph node metastasis of CMM (P > 0.05), while the elevated expression of p-STAT3 in CMM lesions was a predictive factor for lymph node metastasis in CMM (OR = 1.88, 95% CI: 1.05 - 3.38, P < 0.05). Conclusion Increased expression of STAT3 and p-STAT3 in CMM may play important roles in the pathogenesis of CMM, and elevated p-STAT3 expression may contribute to invasion and metastasis of CMM.

The new cataloguing rules, RDA, have been implemented in NLM and more RDA bibliographic data can thus be accessed in domestic medical libraries when the Western documents are catalogued by offloading their bibliographic data.The differences in RDA and AACR2 were compared, the common modified fields and descrip-tive contents were described when the RDA bibliographic data were changed into AACR2 bibliographic data in order to provide certain reference for cataloguing of Western documents using the RDA bibliographic data.

Objective To investigate the effects of all -trans retinoic acid (ATRA),acitretin and tazarotene on apoptosis and active caspase-3 of human melanoma cells A375 and to discuss the relevant significance.Methods The effects of retinoids on apoptosis and active caspase-3 of A375 cells were examined in vitro.Early apoptosis analysis by double staining with annexin V-FITC and PI,and active caspase 3 analysis by the staining of FITC conjugated monoclonal rabbit anti active caspase-3 antibody were measured by flow cytometer.Results ATRA and acitretin induced apoptosis of A375 cells (both P＜0.05),but tazarotene was not effective (P＞0.05).ATRA and acitretin elevated the cell population with detectable active caspase-3 (both P＜0.05),but tazarotene was not effective either (P＞0.05).Acitretin played a most prominent role among the retinoids. Early apoptosis ratio was significantly and positively correlated with active caspase-3 percentage in both ATRA and acitretin (P＜0.05).Conclusions Acitretin and ATRA induce apoptosis of A375 cells in which caspase is critical.Retinoids are prospectively applied as an assisting alternative for treating melanoma.

Objective To explore the relationship of the plasma ox-LDL level and endothelium flow mediated vasodilation(FMD)in acute coronary syndrome patients(ACS).Methods From March to October 2004,in the Department of Cardiology,the Fourth PLA Hospital,51 patients with ACS were divided into 2 groups:AMI group(22patients)and UAP group(29 patients).20 subjects with normal coronary angiograms served as the control group.Nitrir oxide(NO)and plasma ox-LDL was measured by spectrophotometer and Sandwich ELISE method,respectively.The brachial arterial hyperemia-induced flow mediated vasodilation(FMD)and sublingual nitroglycerin(NTG)mediated vasodilation were measured by high resolution ultrasound.Results (1)The FMD in ACS group was significantly decreased compared with the control group[(7.2?1.42)、(7.6?1.12)vs(15.46?1.2),P0.05).(2)The No in ACS group was sigificantly lower than that in control group;the NO in AMI group was even lower[(48.46?12.44)、(60.42?10.30)vs(94.72?12.34)?mol/L,P1,which meant ox-LDL was a risk factor;the OR of FMD was

Objective To investigate the role of oxidized LDL and coronary endothelial dysfunction in the development and progress of coronary heart disease(CHD).Methods 29 patients with unstable angina(UA),25 patients with stable angina(SA) and 20 patients without coronary heart disease(control) were studied.Oxidized low-density lipoprotein(ox-LDL)、 Nitric oxide(NO),and circulating endothelial cells(CEC) were measured in both coronary sinus and peripheral blood during percutaneous coronary intervention(PCI).Results The level of NO in coronary sinus in patients with CHD was lower,while the level of ox-LDL and CEC was markedly higher than those in the control group.In CHD patients,the level of NO in coronary sinus blood was lower,while the level of ox-LDL and CEC was higher than that in peripheral blood.It was no siginificant difference between coronary sinus and peripheral blood was observed in the control group.Conclusion Oxidized LDL not only plays an important role in coronary endothelial dysfunction,but also contributes to the progress in the cornornary heart disease.It may be one of the pathophysiological basis of acute coronary incidents.

Objective To investigate the changes and clinical significance of the plasma cytokines and endothelium function in patients with chronic pulmonary heart failure disease at high altitude area.Methods Plasma levels of tumor necrosisfactor-alpha(TNF-?),interleukin-6(IL-6),endothelin-1(ET-1) were measured in 278 chronic pulmonary heart patients with various degrees of heart failure and in 48 healthy controls.Left ventricular ejection fraction(LVEF),Right ventricular ejection fraction(RVEF) and Pulmonary(PASP) were examined with echocardiography.Results Plasma levels of TNF-?,IL-6,ET-1 were elevated in patients of functional classes Ⅱto Ⅳ as compared with age-matched control subjects and were progressively elvated with the decreasing functional status of the patients.The levels of TNF-?,IL-6,ET-1 respectively were positively correlated with PASP but negtively correlated with LVEF and RVEF(P

Objective:To explore the role of PDCA cycle in the standardized residency training in the department of hematology.Methods:Thirty residents trained in the department of hematology of Peking University Third Hospital from January 2019 to September 2019 were enrolled into experimental group, and 36 residents trained from January 2018 to December 2018 were enrolled into control group. Experimental group received the PDCA cycle teaching method and control group did the traditional one. At the end of the training, the results of theory examination and practical operation skills examination of the two groups were compared. The statistical significance was analyzed on the assessment scores and teaching satisfaction between the two groups. SPSS 20.0 was used for t test. Results:Compared with the control group, the examination scores and teaching satisfaction of the residents in the experimental group were higher than those in the control group ( P < 0.05). Conclusion:The teaching mode of PDCA cycle is conducive to improving the effect of standardized residency training in the department of hematology.

AIM:To study the mechanism of oleanolic acid induced apoptosis and its influence on cell cycle in HL-60 cells in vitro.METHODS:The HL-60 cells were treated with different concentrations of oleanolic acid and then cultured for 12 h,24 h,48 h and 72 h,respectively.MTT assay was used to evaluate the inhibitory effect of oleanolic acid on HL-60 cells in vitro.The argarose gel electrophoresis was used to detect the chromatin DNA fragmentation.FACS was used to analyze the cell cycle of HL-60 cells.Western blotting was used to detect the activation of caspase-3 which has been confirmed the last execution of apoptosis pathway.RESULTS:MTT assay showed that oleanolic acid dramatically inhibited the growth of HL-60 cells in vitro,more than 50% HL-60 cells were inhibited when the cells were treated with 80 ?mol/L oleanolic acid for 48 h;the apparent DNA ladder was detected after exposure of HL-60 cells to oleanolic acid for 48 h.FACS analysis showed that cell cycle of HL-60 cells was arrested in G1 phase,the inhibition ratio of HL-60 cells achieved 63.24% and 67.90% after treated with oleanolic acid for 48 h and 72 h correspondingly.Western blotting detected the activation of caspase-3 after exposure of HL-60 cells to 80 ?mol/L oleanolic acid for 48 h.CONCLUSION:These results suggest that oleanolic acid induces apoptosis and the cell cycle of HL-60 cells is arrested in G1 phase.

Objective To investigate the current situation of healthcare-associated infection(HAI)management in secondary and above medical institutions in Shaanxi Province,analyze development trend,and put forward sugges-tions for improvement.Methods In May-June,2016,170 secondary and above hospitals in 10 cities were selected for surveying through stratified random sampling method.Survey content included basic situation of hospitals,HAI management,HAI monitoring,and so on.Results Available questionnaires were obtained from 165 hospitals (43 tertiary hospitals,and 122 secondary hospitals).Of 165 hospitals,more than 90% have established HAI manage-ment organizations and regulations,but hospital risk management should be paid more attention,only 63.03% of hospitals perfected the risk management system and 66.06% conducted risk assessment.99.09% of hospitals im-plement training on HAI to all staff regularly and 88.41% conducted effective feedback.In the aspect of staff alloca-tion,88.48% of the hospitals assigned enough professionals for HAI management,but only 34.55% have specific training programme for these personnel.Only 33.94% of hospitals have special funds for HAI control;in the aspect of monitoring on HAI,21.21% of hospital installed and used HAI monitoring software;In the aspect of implemen-tation of monitoring programme,about 90% of hospitals developed monitoring on HAI cases and environmental hy-giene,but only 34.55% and 23.64% of hospitals conducted targeted monitoring on intensive care unit and neonatal intensive care unit respectively.Conclusion Organizational structure of HAI management in Shaanxi Province is perfect,relevant rules and regulations are basically established,basic monitoring projects are universal,but the awareness of risk management needs to be strengthened,professional allocation and professional quality develop-ment are both imbalance,informational monitoring is inadequate.

Objective To investigate the antitumor effect and its mechanism of microbubble contrast combined with Mitoxantrone exposed to low-frequency ultrasound on human breast cancer cell MCF-7. Methods MTT method was applied to examine the growth inhibition of MCF-7 treated with Mitoxantrone. MCF-7 cells were randomly divided into 4 groups:Mitoxantrone group (group D), ultrasound+Mitoxantrone group (group U+D), ultrasound+microbuble +Mitoxantrone group (group U+M+D) and control group (group C). The cytoactive of each group was examined with MTT. The intracellular drug content in each group was measured with high performance liquid chromatography. The morphology of MCF-7 cells apoptosis was observed with transmission electron microscopy (TEM). Results The IC_(50) of Mitoxantrone was 2.87 μg/ml. The differences of cytoactive among all groups were significant (P<0.05). The intracellular drug content of group U+M+D was higher than that of group U+D, and the latter was higher than that of group D. The morphological changes of apoptosis were observed with TEM. Conclusion Low-frequency ultrasound can promote intracellular drug content as to enhance the sensitivity of chemotherapy drugs on tumor cells, and this effect can be enhanced by microbubble contrast exposure to low-frequency ultrasound.