Objective To evaluate the clinical significance of K-ras mutation in plasma cell-free DNA from patients with colorec-tal carcinoma .Methods Plasma cell-free DNA in 212 patients with colorectal carcinoma were extracted and identified by Globin gene .K-ras mutation was amplified by RE-PCR and compared with results of pathological biopsy samples DNA .Results Plasma cell-free DNA were successfully obtained from 212 cases .But no plasma cell-free DNA were found in normal control .Out of 212 ca-ses ,34 cases showed K-ras mutation(16 .00% )in cell-free DNA ,and 33 cases showed positive in pathological biopsy samples DNA (15 .57% ) .It was found two kinds of K-ras mutation on code 12-GGT to GAT ;GGT to GTT .K-ras mutation was not related to tumors′position(χ2 =3 .34 ,P=0 .61);to differentiation degree(χ2 =2 .38 ,P=0 .29);to Dukes staging(χ2 = 2 .84 ,P=0 .38);to lymphoid nodes′metastasis(χ2 =0 .98 ,P=0 .37);to age(χ2 =1 .86 ,P=0 .39) .Conclusion Tumor-derived DNA can be detected in plasma of underlying cancer patients .For colorectal carcinoma patients ,detecting K-ras mutation of plasma cell-free DNA have the same clinical significance as biopsy samples .Moreover ,it′s more convenient and non-invasive .

Objective To estimate the effect of a cis-imidazoline derivative,nutlin-3,on the biological behavior of A375 human melanoma cells,and to investigate its mechanism.Methods Cultured A375 cells were divided into several test groups treated with nutlin-3 at different concentrations (2.5,5,10 μmol/L) for 24,48 and 72 hours,and a control group treated with dimethyl sulfoxide (DMSO) only.Then,methyl thiazolyl tetrazolium (MTT) assay was performed to evaluate cellular proliferative activity,Western blot to measure the expression of p53 protein,flow cytometry to estimate cell cycle phase distribution and apoptosis rate,and Transwell assay to evaluate migratory activity,of A375 cells.Statistical analysis was carried out by repeated-measures analysis of variance (ANOVA).Results After treatment with nutlin-3 of 2.5,5 and 10 μmol/L for 24,48 and 72 hours,significant differences were observed among different time points at each concentration and among different concentrations at the same time point in proliferation inhibition rate (F =67.43,135.58,respectively,both P ＜ 0.01),p53 protein expression level (F =1255.00,9196.00,respectively,both P ＜ 0.01),percentage of cells at G2 phase (F =831.38,267.99,respectively,both P ＜ 0.01),apoptosis rate (F =809.45,723.83,respectively,both P ＜ 0.01),migration inhibition rate (F =1100.00,1667.00,respectively,both P ＜ 0.01).The influence of nutlin-3 on cellular proliferative activity increased with the increase in its concentration,and that on percentage of cells at G2 phase,apoptosis rate and migratory activity increased with the increase in its concentration and treatment duration.There was a significant interaction between the treatment duration and concentration of nutlin-3 for p53 protein expression level in (F =826.79,P ＜ 0.01),percentage of cells at G2 phase in (F =21.602,P ＜ 0.01),apoptosis rate in (F =44.48,P ＜ 0.01),migratory activity of (F =313.09,P ＜ 0.01),and cellular proliferative activity of (F =26.95,P ＜ 0.01),A375 cells.Conclusion Nutlin-3 may inhibit the proliferation and migration of,but promote cell cycle arrest and apoptosis in,A375 cells,through accumulation of p53 protein.

Objective To study the effects of UVR or H2O2 on the expression of p53 in human melanocytes,and that of nutlin-3 and PFT-α on the DNA oxidative damage,and to investigate the role of p53 in the antioxidative stress.Methods The effect of UVR,H2O2,nutlin-3 and PFT-α on the expression of p53 of human melanocytes was detected by Western blot analysis,and that of nutlin-3 and PFT-α on UVR or H2O2 DNA damage assessed by single cell electrophoresis (comet assay).Determination of the effect of nutlin-3 on H2O2 DNA damage was detected by γ-H2AX immunofluorescence.Results UVR and H2O2 could induce p53 protein expression,accompanied by increased phosphorylation of p53 on serine 15 residue,and nutlin-3 and PFT-α could induce and inhibit p53 protein in human melanocytes respectively; nutlin-3 decreased the tail moment of DNA oxidative damage of UVR or H2O2 in human melanocytes,but PFT-α increased the tail moment of DNA oxidative damage of UVR or H2O2 in human melanocytes,and there were significant differences among the control and exposed groups; nutlin-3 decreased expression of γ-H2AX.Conclusions p53 plays a very important role in the antioxidative stress in melanocyte exposed to UV or H2O2.

Objective To sum up the imaging features of tuberous sclerosis.Methods CT and MRI findings of brain in 20 patients with tuberous sclerosis proved by clinic,imaging or pathology were retrospectively studied. Results Among 20 cases,on CT,the lesions appeared as subependymal calcified noduli in 16 cases (multiple noduli in 14 cases and single nodule in 2) and subependymal uncalcified noduli in 2,the noduli were 2~12 mm in diameter,2 cases were normal.On MRI,the subependymal noduli were multiple in 19 cases and single in one case,the noduli were iso-or hypointensity on T1WI and iso-,hypo or hyperintensity on T2WI.In addition,the lesions within cortical or sub-cortical matter were demonstrated by MRI in 19 cases,and the abnormal signals were showed in local patterns of cortical tubers.The abnormal findings of white matter were radial linear or wedge-shaped or irregular type in 7 cases.The subependymal noduli were enhanced,and the most of cortical lesions were not enhanced after contrast-enhanced MR scans in 9 cases.Conclusion There are characteristic findings of tuberous sclerosis both on CT and MRI.

Purpose To explore the relationship between epicardial adipose tissue (EAT) volume and ascending aortic stiffness by CT,so as to early evaluate the lesions of ascending aortic by measuring EAT.Materials and Methods 169 patients with suspected coronary artery disease who underwent coronary CT angiography and coronary angiography in First Affiliated Hospital of Jinzhou Medical University from January 2016 to September 2016 were enrolled.According to the presence of coronary atherosclerosis or not,the patients were divided into research group (109 cases) and control group (60 cases).The research group were further divided into slight,mild,moderate and severe group according to the Gensini score of coronary atherosclerosis.The recorded threshold of EAT volume was 107.2 cm3.The patients with EAT volume higher than 107.2 cm3 belonged to the exposure group,and the rest belonged to the non exposure group.The EAT volume and ascending aortic stiffness were measured,and the relationship between them was assessed.The relationship between EAT volume and coronary atherosclerosis was also analyzed.Results In the control group,there was no correlation between EAT volume and ascending aortic stiffness (r =-0.156,P＞0.05).However,there were negative correlations between EAT volume and ascending aortic stiffness in slight,mild,moderate and severe group (r=-0.378,-0.340,-0.514 and-0.459,P＜0.05).The EAT volumewas an independent risk factor of ascending aortic stiffness (β=-0.009,t=-2.653,P＜0.05).The incidence of CAD in the exposure group was 9.318 times of that in the non exposure group.Conclusion There is obvious correlation between EAT volume and ascending aortic stiffness in patients with CAD.The evaluation of EAT volume can provide an effective reference for the early prediction of ascending aortic lesions in patients with CAD.

Objective To realize intelligent and refined management of medical war storage materials by designing a management platform based on context awareness.Methods The conditions of medical war storage materials and its storage environment were monitored dynamically,and technologies of context awareness,radio frequency identification,temperature and humidity sensing and etc were used to establish the platform.Results The platform improved the traditional medical war storage materials management system in intelligence and refinement,and implemented auto update and intelligent alarm for the information on medical war storage materials.Conlusion The platform fulfills automatic and intelligent medical war storage materials management,and thus has practical values for medical service support.

Objective To observe the change of neuron-specific enolase (NSE) an d glial fibrillary acidic protein (GFAP) in neonatal rats' cerebral cortex with hypoxic-ischemic brain damage (HIBD). Methods The 7 day- old SD rats were subjected to the ligation of right carotid artery, then were pu t into a hypoxic box to establish a HIBD model. The immunohistochemical method w as used to detect the expression of NSE and GFAP in rats' cerebral cortex. Results ① The NSE decreased in damaged cerebral cortex in HIBD 24 h group, after 7 days it gradually increased but was still lower than that of the controls. ② The expression of GFAP was limited and scarce in control and it did not change in HIBD 24 h group, while in HIBD 7 d group GFAP expression was increased and spread widely in the damaged cerebral cortex. Conclu sion ① The NSE decreases in damaged cerebral cortex in early stage of neonatal rat HIBD, suggesting that NSE is a specific marker for neuron damage . ② The GFAP increases in damaged cerebral cortex in the recovery stage of neon atal rat HIBD, suggesting that GFAP participates the repair of lesion region.

Hazards of noise-induced hearing loss (NIHL) to crowd who are long-term exposured and work in the noisy environment is increasingly prominent. But just part of the individuals who are exposed to the same noisy environment have hearing loss, and the severity of hearing loss are different, which indicates genetic predisposition might be associated with NIHL. In recent years, many experts and scholars at home and abroad have done a lot of research in this field, this article summarizes all available studies.
Genetic Predisposition to Disease ; Hearing Loss, Noise-Induced ; genetics ; Humans ; Noise, Occupational ; adverse effects

Objective To design and realize hospital special information system and solve the information management questions of special diagnosis, such as emergency observation, radiation therapy, hemodialysis, assisted reproductive of bear and rear better children. Methods The main problems of hospital special medical in China were analyzed and defined the basic concept of hospital special medical. The main flow and system of hospital special medical from 13 aspects were introduced. Results The work mode and management methods about special medical were changed and solved the limitations of traditional management. Conclusion The design and realization of hospital special medical information systems can be improved work efficiency, medical quality effectively and the informationization level of the hospital.

Objective To develop a set of hospital material management information system with the mature technique of barcode so as to realize the whole flow management of material.Methods By analyzing the main problems in present hospital material management,we put forward ways and procedures of material management,and gave an overall introduction to the composition of the system from three aspects: warehouse management on material and drugs,the second level storehouse management,such as material management in department,inspect reagent consumptive material management,no stock for high-cost medical consumables management,etc and the cost accounting and collecting system.The key technologies and implementation methods adopted in the designing process of this system were also introduced.Results The achievement of whole flow tracking management from material purchase to material consumption not only ensures a real whole flow management of materials,but effectively reduces the consumption of hospital materials.Conclusion With the mature and advanced technique of barcode and wireless network,the management of material can be better achieved.