Objective To verify and adjust the leaf position accuracy of a multi-leaf collimator (MLC) in a linear accelerator.Methods Ionization chamber arrays ( StarTrack, IBA) were used to measure the leaf position accuracy of a MLC in a linear accelerator (Precise, ELEKTA) and adjust the leaves out of tolerance.Results After the adjustment of leaf position of the MLC, the analysis of the verification films taken at the offset position showed that the leaf position of the MLC was accurate.Conclusions The method developed in this study is convenient and simple for measurement and calibration of leaf position of the MLC in the linear accelerator, which meets the MLC position accuracy requirement for the linear accelerator.

This article introduced HUANG Hai-long’s clinical experience in treating miscellaneous diseases, such as hysteromyoma, secondary infertility and hemospermia, and introduced the therapeutical effect of hualiu decoction, which was one of HUANG Hai-long’s empirical formula, and explained the clinical experience in treating hemospermia by the method of applying clearing after tonifying.

OBJECTIVE　To develop a method for the determination of theophylline in serum with concomitant use of ofloxacin.METHODS　Theophylline was serum was extracted with chloroform-hexane(7∶3,v/v) after some ammonium sulfate was added.It was re-extracted with NaOH solution (0.1 mol*L-1)and detected with a UV spectrophotometer at 275 nm and 299.5 nm respeitively.RESULTS　The method was linear over the range of 5.0～40.0 mg*L-1(r=0.9997,n=7).The average recovery of methodology was 100.3%(RSD=1.2%),and the extraction recovery from serum was 87.7%(RSD=4.6%).CONCLUSION　This practical method for the determination of serum theophylline can eliminate the interference of ofloxacin and other antibiotics.

BACKGROUND:Bone ultrastructural destruction is an important cause for bone strength decrease,bone friability and bone fracture incidence increase in osteoporosis.OBJECTIVE:To observe the ultrastructural changes of distal femur cancellous bone in glucocorticoid (GC)-treated rats by scanning electron microscopy (SEM).METHODS:A total of 32 female Sprague-Dawley rats,aged 3.5 months old,were respectively treated with methylprednisolone 3.5 mg/kg per day by subcutaneous injection to induce osteoporosis and normal saline.At 4 and 9 weeks,the distal femurs were coronary sectioned and rinsed with distilled water,dehydrated in graded ethanol,coated with gold,and observed by SEM.RESULIS AND CONCLUSION:Compared to the control,the number of bone trabeculae in the GC group was significantly decreased,and the bone trabeculae became thin,fragile,discontinuous;network structures of bone trabeculae were destroyed,and bone resorption surface increased,with disorderly arranged collagenous fibers and increased micro-damage.Rats treated with GC for 4 weeks maintained better bone ultrestructure compared with rats treated with GC for 9 weeks.Results show that GC can induce bone mass lost,destroy network structures of bone trabeculae,accelerate bone resorption in rat cancellous bone,and accordingly lead to increased bone brittleness and decreased bone functional of biodynamics.

Objective To investigate the killing effect of ethacrynic acid (EA) on lung cancer A549 cells derived spheres and explore the underlying mechanism.Methods A549 spheres were cultured in serum-free medium,and the protein expression of CD133,SOX2,EpCAM and ABCG2 was detected by Western blotting.MTT assay was used to evaluate the cell viability of A549 spheres and A549 cells after treated by 1,2,5,10 and 20 mg/mL cisplatin (DDP) for 48 h.The activity of glutathione S-transferase (GST) was measured by colorimetric method after A549 spheres were treated with 10,50,100 and 200 μmol/L EA,respectively.Flow cytometry,Western blotting,real-time PCR and luciferase assay were used to analyze the levels of cellular reactive oxygen species (ROS),formation of A549 spheres,mRNA and protein expression levels of β-catenin,Sox2 and ABCG2,and promoter activity of β-catenin upon 200 μmol/L EA treated cells for 48 h.A549 sphere was infected with β-catenin adenovirus for 24 h,followed by 200 μmol/L EA treatment (in presence or absence of 5 mg/mL DDP) for 24 h.The expression of β-catenin,Sox2 and ABCG2 at mRNA and protein levels was detected by real-time PCR and Western blotting,and cell growth of A549 spheres was evaluated by MTT assay.Results The A549 spheres,with high expression of tumor stem cells markers CD133,SOX2,EpCAM and drug resistance related molecule ABCG2,and resistance to DDP at different doses,were successfully derived.After 200 μmol/L EA had treated A549 sphere for 48 h,the levels of ROS were significantly increased (P ＜ 0.05),and the mRNA and protein levels of β-catenin,Sox2 and ABCG2,and promoter activity of β-catenin were notably decreased (P ＜ 0.05).The treatment of 200 μmol/L EA enhanced the inhibitory effect on proliferation and the promoting effect on apoptosis in A549 spheres induced by 5 mg/mL DDP (P ＜ 0.05).Up-regulation of β-catenin by adenoviral infection partly reversed the effects of 200 μmol/L EA on suppressing the expression levels of β-catenin,Sox2 and ABCG2,compared to the spheres infected with blank adenovirus.Additionally,β-catenin over-expression significantly remitted the inhibitory effect of 200 μmol/L EA and 5 mg/mL DDP on the proliferation in A549 spheres.Conclusion EA exerts inhibitory effect on the proliferation and stemness of A549 spheres through suppressing GST activity and β-catenin expression,and then promotes cell apoptosis.EA might be a novel drug in treatment of lung cancer and cancer stem cells.

Background The establishment of chronic ocular hypertension is a basis for the research of glaucoma.Previous laser photocoagulation method to establish ocular hypertension model showed obvious fluctuation of intraocular pressure (IOP) and complications and need repeatedly photocoagulation.Improvement of modeling method is of important significance for glaucoma.Objective This study was to establish chronic ocular hypertension rat models by transgoniscope laser photocoagulation to trabecular meshwork and to compare this method with previous translimbal laser photocoagulation.Methods Thirty-six 8 to 12-week-old clean grade Fischer344 rats were collected and divided into normal control group,translimbal laser photocoagulation group and transgoniscope laser photocoagulation group,12 rats for each group.Five hundred and thirty-two nm YAG laser was used to photocoagulate trabecular meshwork translimbally in the right eyes of rats in the translimbal laser photocoagulation group,with the laser power 440-500 mW and spots 40-60,and the photocoagulation was perfored transgoniscopely in the right eyes of rats in the transgoniscope laser photocoagulation group,with the laser power 800-850 mW and spots 100-120.IOP was measured by using Tonolab tonometer in all the rats after modeling.The rats were sacrificed 3 weeks after modeling and retinas were isolated,the Tuj-1 positive retinal ganglion cells (RGCs) were counted by immunofluorescence technology.The use and care of the animals followed the Statement of ARVO.Results The successful rate of establishement of models was 75％ in the translimbal laser photocoagulation group and 100％ in the transgoniscope laser photocoagulation group.The mean IOP was (11.0±1.3),(23.4±12.6) and (25.3± 4.9) mmHg,and the peak IOP was (12.3 ± 1.0),(50.5 ± 7.3) and (44.3 ± 12.3) mmHg in the normal control group,transgoniscope laser photocoagulation group and translimbal laser photocoagulation group,respectively,with significant differences among the groups (F=25.496,80.762,both at P＜0.001),and the mean IOP was significantly higher in the transgoniscope laser photocoagulation group and translimbal laser photocoagulation group than that in the normal control group (all at P＜0.001),and no significant differences in the mean and peak IOP between transgoniscope laser photocoagulation group and translimbal laser photocoagulation group (P=1.000,P=0.195).The numbers of Tuj-1 positive RGCs in the retinas were (2 048.2± 148.5),(645.2 ± 177.1) and (1 223.7 ± 148.6)/mm2 in the normal control group,transgoniscope laser photocoagulation group and translimbal laser photocoagulation group,showing a significant difference among the groups (F=98.767,P＜0.001).The number of Tuj-1 positive RGCs was considerably reduced in the transgoniscope laser photocoagulation group and translimbal laser photocoagulation group compared with the normal control group and the number of Tuj-1 postive RGCs was low in the translimbal laser photocoagulation group compared with the transgoniscope laser photocoagulation group (all at P＜0.001).Conclusions Transgoniscope laser photocoagulation targeting trabecular meshwork can induce chronic ocular hypertension and RGCs losing.However,its pattern is different from translimbal laser photocoagulation.Transgoniscope laser photocoagulation has a higher successful rate of chronic ocular hypertention than that of translimbal laser photocoagulation.

Objective To investigate the effect of signal transducers and activators of transcription 3(STAT-3)on sen-sitizing oral squamous cell carcinoma to cis-dichlorodiamineplatinum via downregulating miRNA-21. Methods Tscca and Tca8113P160 human tongue squamous cell carcinoma cell lines were employed in this study. WP1066 was used to suppress STAT-3 signaling pathway. Cells were divided into three groups:dimethyl sulphoxide (DMSO) group, cis-dichlorodiamine-platinum (DDP) group and WP1066+DDP group. Transcription level of miR-21 was assessed by real-time PCR, while the expression levels of STAT-3, p-STAT-3, tissue inhibitor of metalloproteinase-3 (TIMP-3) and matrix metalloproteinase-2/9 (MMP-2/9 ) were evaluated by Western blot assay. Matrigel matrix and transwell assay were used to determine cancer cell colony formation and invasive ability respectively. Expression level of miR-21 was examined by luciferase reporter gene as-say. Results Expression levels of STAT-3, pSTAT-3 and miR-21 were significantly suppressed by WP1066 treatment. The diameters of culture colony in cells treated with WP1066 and DDP were smaller than those in control group. The number of tongue cancer cells that migrated through the transwell membrane in WP1066 and DDP treated group was less than that in control group. Additionally, MMP-2/9 expression decreased while TIMP-3 increased dramatically in both cell lines in WP1066+DPP group compared to the other two groups. Conclusion Reduction of STAT-3 can sensitize oral squamous cell carcinoma to cis-dichlorodiamineplatinum via downregulating miR-21. Our study shows that DDP, in combination with WP1066, might be used as a potential target in the treatment of human oral squamous cell cancer.

Objective To explore the expressions of Cyclin-dependent kinase 5 (CDK5) and Epithelial-Mesenchymal Transition (EMT) related proteins including N-cadherin, Vimentin and E-cadherin in head and neck squamous cell carcino? ma (HNSCC), and to determine the relationship between the expression of CDK5 and prognosis. Methods The expression levels of CDK5 and EMT related proteins were evaluated by immunohistochemistry in 55 patients who were diagnosed as HN?SCC. They were also analyzed in different clinical pathological factors. The correlation of CDK5 and EMT related proteins as well as the relationship between the expression of CDK5 and prognosis were also analyzed. Results The expression level of CDK5 was significantly higher in patients with lymph node metastasis than that in patients with non-lymph node metastasis (91.67%vs 30.23%, P<0.05). It’s also higher in T3-T4 stages than that in T1-T2 stages (85%vs 20%, P<0.05). The ex?pression levels of N-cadherin and Vimentin were significantly higher in patients with lymph node metastasis than those in patients with non-lymph node metastasis (75.00%vs 6.98%;91.67%vs 27.91%, all P<0.05). However, the expression level of E-cadherin was significantly lower in patients with lymph node metastasis (8.33%vs 86.05%, P<0.05) compared to that in patients without. CDK5 was positively correlated with N-cadherin and Vimentin, but negatively correlated with E-cad?herin (rs=0.512, 0.443,-0.363, all P<0.01). The 3-year survival rates were significantly lower in patients with high expres?sion of CDK5 (37.5%) than that in patients with low expression of CDK5 (87%, Log-rankχ2=12.678, P<0.01). Conclusion CDK5 and EMT related proteins were activated abnormally in HNSCC with lymph node metastasis. CDK5 may be a new bio?logical marker for prognosis of HNSCC.

To sum up the reform of internal performance appraisal system and income allocation system of Shanghai municipal hospitals.The internal performance appraisal index system,evaluation methods and corresponding income allocation system,featuring two breaks,one change and eight elements.The reforms highlight public welfare nature of public hospitals,which is expected to create profound impacts on hospital operation and medical staff behavior.

Objective:In order to cope with the rising risk pressure on the economic operation of public hospitals,it aims to re-search and construct a comprehensive economic operation evaluation index,and improve the comprehensiveness,scientific and dynamic nature of monitoring and analysis of the economic operation of public hospitals.Methods:Literature research,expert consultation and hierarchical analysis were adopted.Results:A comprehensive evaluation model of public hospitals'economic operation covering 5 dimensions and 25 indexes,including structural optimization,controllable risk,efficiency enhancement,smooth operation and sustain-able development,has been constructed;empirical analyses of the overall index,sub-indexes and monthly indexes have been carried out on the data of some of the tertiary hospitals in Shanghai,which have verified the validity of the above index model in enhancing the monitoring,analysis and evaluation of the hospitals'economic operation,and revealed the role of the above index model in the changes of the economic conditions of the hospitals and the factors.Conclusion:Constructing a comprehensive evaluation index can effectively complement management such as comprehensive assessment and evaluation of public hospitals and traditional financial descriptive analysis.