Objective To investigate the mechanism of the fluorouracil(FU)drug resistance and to prove deeply the role of serum dihydropyrimidine dehydrogenase(DPD)activity in patients with gastric cancer resistance to FU with the level of cell culture. Methods The peripheral blood was collected from 45 patients with advanced gastric cancer before chemotherapy to detect the activity of DPD by high performance liquid chromatography(HPLC).The patients were divided into two groups(high activity group and low activity group)according to the results. The FU drug inhibitory rate of gastric cancer cell cultured in vitro were tested with MTT to compare the effects of the two groups. Result The FU drug inhibitory rate of gastric cancer cell cultured in vitro was obviously lower in high activity group than that in low activity group,(47.6±±4.0)%,(53.7±8.0)%respectively. Conclusion The activity of serum DPD may be simple and convenient indicators in predicting the resistance to FU.

Forty rats were randomly divided into four groups and intraperitoneal injection of 1%lidocaine 400mg/kg (group Ⅰ)、1%lidocaine-?-cyclodextrin 400mg/kg (group Ⅱ)、1%alkalinized lidocaine 400mg/kg(group Ⅰ)and 1% alkalinized lidocaine-?-cyclodextrin 400mg/kg(group Ⅳ) respectively. The results showed that there was a significant difference of lethal time between group Ⅰ and Ⅱ, and no significant difference between gronp Ⅲ and Ⅳ; the times of toxic and lethal effects of group Ⅲ and Ⅳ were shortened markedly as compared to group Ⅰ and Ⅱ. It is concluded that ?-cyclodextrin can postpone the release and absorbance of lidocaine,and alkalizer can weaken this action of ?—cyclodextrin.

Objective To study the pathogenetic role of HPV infection and vascular endothelial growth factor-C in the development of cervical carcinomas. Methods HPV16 DNA was tested in cervical intraepithelial neoplasia(CIN) 11I, cervical carcinomas and norma1 cervical tissue by PCR.and the expression of vascular endothelial growth factor-C protein was examined by immunohistochemistry. Results The expression of VEGF-C became stronger and stronger with the progression of cervical diseases from chronical inflammation to CIN and to invasive carcinoma of cervix uteri, but no expression in normal cervical tissue. There was significant correlation between HR-HPV and VEGF-C expression in CIN and cervical carcinomas(odds ratio are 19.12 and 20.49; 95 % confidence interval are 2.31-157.8 and 3.28-226.09). Conclusions The expression of VEGF-C, maybe a sensitive maker, is closely related to HR-HPV infection.

Objective To investigate the risk factors of incision infection in elderly patients of general surgery.Methods The clinical data of 306 elderly patients of general surgery were analyzed retrospectively.The risk factors of incision infection were analyzed.Results The rate of incision infection was 10.5％ (32/306).The rate of incision infection in chronic disease patients was higher than that in non-chronic disease patients [12.9％(27/210) vs.5.2％(5/96)],the rate of incision infection in summer was significantly higher than that in spring,autumn and winter[16.3％(15/92) vs.8.4％(7/83),8.5％(6/71) and 6.7％ (4/60)],the rate of incision infection in operative time longer than 120 min patients was higher than that in operative time less than 120 min patients [15.0％ (18/120) vs.7.5％ (14/186)],the rate of incision infection in emergency surgery patients was higher than that in non-emergency surgery patients [12.3％ (20/162) vs.8.3％(12/144)],there had significantly difference (P＜ 0.05).Conclusion Chronic disease,summer,operative time longer than 120 min,emergency surgery in elderly patients are the mainly risk factors of incision infection in general surgery.

ObjectiveTo explore the imaging of the thrombosis after pharmacological triggering of plaque rupture in atherosclerotic rabbit model by using 3.0 T high-resolution magnetic resonance imaging.MethodsTwenty male New Zealand white rabbits were divided into an experimental group (n = 16) and a control group (n = 4).The aortic wall injuries were induced by an intravascular balloon in experimental group rabbits after high cholesterol diet.The pharmacological triggering with Russell's viper venom and histamine was performed after 3 months of establishment of model.All of the animals underwent pre-trigger and post-trigger MR examinations including 3D time of fight (3D TOF),T1 WI,T2WI and post contrast T1 WI.Euthanasia was performed in all rabbits and gross anatomy and histological specimen of aorta were obtained.Comparing the location and length of the thrombus between MRI images and histopathology was used Pearson test.Comparing the calculated indexes of abdominal aorta between rabbits with and without thrombosis was used AVONA test and LSD-t test.Results After triggering,8 in 14 survived rabbits developed thrombosis in experimental group,meanwhile,no thrombus was found in control group.The accuracy of multi-sequences MRI for detecting of thrombus was 87.1％ (27/31).MRI data correlated with the histopathology regarding thrombus length ( r = 0.85,P ＜ 0.01 ) and thrombus location ( r = 0.94,P＜0.01 ).Compared with rabbits without thrombosis,the rabbits with thrombosis had narrower lumen of abdominal aorta in the pre-triggered MR images [ ( 5.71 ± 2.38 )mm2 vs.( 8.93 ± 5.36) mm2,P ＜ 0.01 ].ConclusionMRI is useful tool to determine the thrombosis and plaque rupture in atherosclerotic rabbit model.

Objective To investigate the effect of the Ras-related tumor suppressor gene aplasia Ras homolog member Ⅰ (ARHI) on angiogenesis in hepatocellular carcinoma (HCC).Methods We generated stable cell lines overexpressing ARHI in Hep3B cells,which lack endogenous ARHI.Cell proliferation was assessed by the MTT assay.The effects of ARHI overexpression on tumor growth and angiogenesis were assessed.Because of the key role of mammalian target of rapamycin (mTOR)signaling in HCC progression,we also tested whether ARHI overexpression affected the mTOR pathway.Results Ectopic expression of ARHI significantly diminished cell proliferation in Hep3B cells (P＜0.01).ARHI overexpression significantly retarded Hep3B xenograft growth by 76.4 ％ in vivo,and caused a marked reduction in tumor angiogenesis assessed by CD31-stained microvessel count.Western blot analysis of the xenografts showed that ARHI overexpression substantially reduced the phosphorylation of two mTOR substrates,S6K1 and 4E-BP1,indicative of an inactivation of the mTOR pathway.Accompanying with the mTOR inactivation,the angiogenic factors,hypoxia-inducible factor 1 alpha and vascular endothelial growth factor,were significantly downregulated.Conclusion These data highlighted an important role for ARHI in controlling HCC growth and angiogenesis,therefore offering a possible therapeutic strategy against this malignancy.

Objective The study was to investigate the feasibility of using an intravascular Loopless Monopole Antenna (ILMA) for 3.0 T MR imaging of water bath and deep-seated arterial walls of experimental animal.Methods A novel intravascular loopless monopole antenna (ILMA) was developed,including a non-shield loach guide-wire and a matching circuit.The non-shield loach guide-wire is used as a receive antenna,with the diameter of 0.019 in( 1 in =2.54 cm) and length of 23.11 in.During the MR scanning,the ILMA was used as a receive-only probe,while body coil was used to transmit the RF pulses.Utilizing the coil in water bath and in-vivo animal experiment,we measured signal-to-noise ratio (SNR) and contrast-to-noise ratio(CNR) of artery wall using the same scanning parameter compared with phased-array coil.Results In the study,the developed novel ILMA conduced to improved SNR of imaging and much higher space resolution( 313 μm).First,the feasibility of acquiring the wall images was demonstrated on phantoms.The SNRs map generated by the matlab software showed that in comparison with the phased-array coil,ILMA generated higher SNR of the phantom wall when using the same sequences,parameters,and slices (86.8 ±0.8 vs.9.9 ±0.1,P ＜0.01 ).When imaging the aorta wall with the ILMA and phased-array coil,the SNRs of the arterial wall with the ILMA is 60.4 ±20.9,61.3 ±22.5,59.8 ±20.4,32.3 ±22.6 (T1WI),51.2 ±21.6,49.8 ± 15.5,50.4 ± 17.2,22.4 ± 18.3 (T2WI),the CNRs of the aorta wall with theILMA is 19.8±8.1,18.9±9.2,19.6±11.8,20.7 ± 13.3(T1WI),17.7±6.4,18.6±6.9,17.2 ± 6.4,17.2 ± 6.4 ( T2 WI),compared with phased-array coil,t values SNR:6.36,3.84,3.51,6.92(T1 WI),3.47,4.89,6.35,4.21 (T2WI),CNR:3.56,3.97,-0.71,4.74 (T1WI),3.99,3.01,4.27,5.03(T2 WI,P ＜ 0.05 ),respectively.Conclusion The study demonstrates the capability of using an MR ILMA to generate 3.0 T MR in-vivo experiments,the developed novel ILMA conduces to increased SNR compared with the conventional phased-array coil.

Objective To investigate the application of low-dose adaptive sequence scan of dual-source CT coronary angiography in patients with high heart rate and evaluate the image quality.Methods Seventy-two patients who underwent coronary CT angiography with heart rate> 70 bpm were divided into 2 groups.Group A was adaptive sequence scan, and Group B was retrospective ECG-gating helical scan.Examinations were performed on a dual-source CT scanner (Somatom Definition) .All images were transferred to a workstation for further processing and analysis.The image quality was evaluated using same criteria.The image quality of coronary artery segments was compared in two groups using rank sum test, and the radiation dose was compared using t test Results A total of 501 coronary artery segments were evaluated in group A and 400 segments in group B.The mean ranks in image quality of coronary artery segments in group A was 475.42, whereas 420.41 in group B.There was a statistical difference in image quality between the two groups (Z= - 3.509,P=0.000).The effective dose was on average (6.2±0.9) mSv in group A, whereas on average (14.7±1.9) mSv in group B, there was a statistical difference between the two groups(t= - 27.011, P=0.000).Conclusions Adaptive sequence scan in dual-source CT coronary angiography is feasible in patients with high heart rates.This scan mode can substantially reduce radiation dose and maintain the diagnostic image quality.

Objective To investigate the value of contrast enhancement T1 mapping in detection of diffuse myocardial fibrosis in cardiomyopathy, and the relationship between myocardial fibrosis and cardiac function. Methods From September 2013 to September 2014, 76 cases of cardiomyopathy patients (including myocarditis) and 33 cases of healthy controls were enrolled in our study. All the subjects underwent cardiac MR (CMR) examination. Scan sequences included cine MR, pre-contrast and post-contrast T1 mapping and late gadolinium enhancement (LGE) imaging. The pre-/post-contrast left ventricle average T1 value and cardiac function of patients and controls were measured and compared by using independent-samples t test. According to the LGE imaging, all the subjects were subsequently divided into LGE positive group, LGE negative group and control group. The myocardial average T1 value and cardiac function among the three sub-groups were compared by using one-way ANOVA, and the relationship among them were analyzed by using Pearson correlation. Results Among the 76 cases of non-ischemia cardiomyopathy patients, 51 cases (67.1%) had LGE. Compared with controls, cardiomyopathy patients presented with higher pre-contrast T1 value [(1 306.4 ± 84.6)ms vs. (1 266.6 ± 57.3)ms, t=2.10, P<0.05] and lower post-contrast T1 value [(483.6 ± 112.0)ms vs. (534.1 ± 92.7)ms,t=-0.27, P<0.05]. Pre-contrast and post-contrast average T1 value of LGE positive patients were (1 322.2 ± 85.8) and (459.7 ± 132.2)ms respectively;pre-contrast and post-contrast average T1 value of LGE negative patients were (1 267.0 ± 68.5) ms and (521.0±95.2)ms, there were statistical significant differences of T1 value between LGE positive and LGE negative patients (P<0.01), however, there were no statistical significant differences of T1 value between LGE negative patients and controls (P>0.05). There were correlation between pre-/post-contrast left ventricle T1 value and ejection fraction (EF) in cardiomyopathy patients (r=-0.252,-0.217, P<0.01), however no statistical correlation with other cardiac function parameters (P>0.05). Conclusions The average pre-/post-contrast T1 value in left ventricle myocardium are helpful for detection of diffuse fibrosis in cardiomyopathy patients. The LGE positive is a sign that can greatly change the T1 value of the myocardial tissue, meanwhile, myocardial fibrosis is negative correlated with ejection fraction in cardiomyopathy patients.

BACKGROUND:C-reactive protein has been shown to rapidly increase during the occurrence of inflammation and tissue injury, and can indicate the degree of inflammatory reaction.
OBJECTIVE:To analyze the correlation between survival time and C-reactive protein in rabbits after transplantation of polytetrafluoroethene artificial trachea with support ring.
METHODS:The cervical trachea of rabbits was replaced by polytetrafluoroethene artificial trachea with support ring. Survival time of the rabbit, and the changes in serum C-reactive protein at 1-7 days after transplantation were observed. Linear regression was used to assess the univariate association between serum C-reactive protein and survival time.
RESULTS AND CONCLUSION:The linear correlation was observed between changes of serum C-reactive protein and survival time in rabbits with artificial trachea replacement operation. C-reactive protein levels in rabbits with<13 days of survival time were increased and positively associated with the number of days after transplantation. However, C-reactive protein levels in rabbits with>13 days were decreased and negatively associated with the number of days after transplantation. In rabbits with positive correlation and negative correlation, the median survival time and 95%confidence interval (CI) were respectively 10 days (95%CI 8.614-11.386 days) and 27 days (95%CI 23.970-30.030 days). The survival rate in negative correlation group was significantly higher than positive correlation group (x2=29.364, P<0.01). Results suggested that the prolonged survival time of rabbits after artificial trachea replacement operation was related to the decreased concentration of serum C-reactive protein.