Objective To establish a RP-HPLC method for determination of aconitine in Shenhailong capsules.Methods Zorbax SB-C18column(4.6 mm?250 mm,5 ?m)was used,with(methanol∶water∶triethyl amine)60∶40∶0.1,as the mobile phase.The flow rate was 1.0mL?min-1and the column temperature was at 30℃.The detection wavelength was 240nm.Results Aconitine concentration presented a good linear range of 0.04?10-3～4?10-3g?L-1(r = 0.9999).with the average recovery of 98.4%,and RSD :1.0%.ConclusionThe method was accurate,nice in reproducibility and with few interference.It could be used for quality control of Shenhailong capsules.

Myocardial fibrosis is a predominant pathological change of radiation-induced heart disease (RIHD) in late stage.It often occurs several or more than ten years after radiotherapy and can lead to myocardial remodeling, impaired cardiac function, and heart failure.At present there is no effective method to prevent or reverse the development of radiation-induced myocardial fibrosis.Many cells, cytokines, and other factors are involved in the development and progression of myocardial fibrosis in RIHD and some of them have been validated.But most investigators focused on the pathological changes and related mechanisms in early stage, and myocardial fibrosis was just regarded as an endpoint event.The definitive mechanisms of myocardial fibrosis in late stage remain unclear.This paper reveiws the studies about general mechanisms of myocardial fibrosis in RIHD and summarizes the roles of microcirculation dysfunction, mast cells, several cytokines, hypoxia, oxidative stress, and renin-angiotensin system, and points out the future research direction of the pathogenesis of myocardial fibrosis in RIHD.It provides new ideas for discovering the potential targets for clinical intervention of myocardial fibrosis in RIHD.

Objective To divide computed tomography (CT) values into different ranges and investigate the influence of CT value division on dose calculation, and to propose a method to combine magnetic resonance imaging (MRI) with assigned CT values.Methods Ten CT images each were collected from patients with head and neck, chest, and pelvic tumors.Random sampling was performed for the CT values of main tissues or organs at the three parts, and then the mean CT value of each tissue or organ was calculated to divide the CT values into different ranges.A virtual phantom was built in the Varian Eclipse treatment planning system, and for the prescribed dose of 100 cGy, the machine output was recorded at different CT values.The influence of different CT value ranges on dose calculation was analyzed.The treatment plans of intensity-modulated radiotherapy were selected from 5 cervical cancer patients, and new CT values were assigned to the planning target volume (PTV) and organs at risk to obtain new CT images.The plans were transferred to the new CT images and compared with the results on the original CT images in terms of dosimetric parameters.Results After dividing the CT values into different ranges and verifying the results in dose calculation, the CT values corresponding to different human tissues or organs were-100 to 100 HU.The influence of CT value variation on dose calculation was within 3%.In the same treatment plan, there were small differences in dosimetric parameters between new CT images and original CT images.Dmax, Dmean, D98%, D95%, D5%, and D2% of PTV were all below 3%, and Dmax and Dmean of the bladder, rectum, small intestine, femoral head, and bone marrow were below 2%.Conclusions The influence of CT value division on dose calculation in the treatment planning for pelvic tumors is acceptable, so it can be used in combination with MRI.

AIM:To explore the role of Bcl-2 and PCNA expression in the injury of rat myoblasts induced by hydrogen peroxide (H2O2).METHODS:Rat myoblasts at growth phase were divided into 4 groups based on basic fibroblast growth factor (bFGF) and H2O2 levels:normal control group, bFGF group, model group (H2O2 group) and treatment group (bFGF+H2O2 group).The expression of Bcl-2 and Bax was observed by immunohistochemistry and fluorescence methods.The protein levels of Bax, Bcl-2 and PCNA were determined by Western blot.RESULTS:Compared with model group, both immunofuorescence and fluorescence in treatment group showed enhanced Bcl-2 and low expression of Bax.Furthermore, the results of Western blot showed up-regulated PCNA and Bcl-2 protein and decreased Bax expression in treatment group.CONCLUSION:Oxidative stress results in the pathologic changes of myoblasts, and the up-regulation of Bcl-2 and PCNA may attenuate myoblast injury.

Immunohistochemistry was used to detect the protein expression of Snail in 5 specimens jusxta-eancerous normal breast tissues, 35 specimens of cancerous tissues without metastasis and 20 specimens of breast carcinoma with lymphonode metastasis. Breast carcinoma cell line MDA-MB-231 was transfected with antisense Snail. Results showed that the expression of Snail protein was significantly higher in breast carcinomas than in their normal tissues. The mRNA and protein expressions of Snail in the breast carcinoma cells treated with antisense Snail was significantly decreased while the E-cadherin protein significantly increased (both P < 0.05). The number of invasive ceils treated with antisense Snail was (10.5±1.3)%, while in treated with EGFP was (68.2±2.1)% (P < 0.05). The abnormal expression of Snail contribute to the invasiveness of breast carcinoma. The antisense Snail could prevent the cells ability to invade in vitro, and the effect is related with the up-regulated E-cadherin protein.

ObjectiveTo investigate the CT number linearity of the cone-beam CT (CBCT) images at the different spatial locations in the scanning area.MethodsThe CatphanS04 phantom at the different locations are scanned repeatcdly using the CBCT on the Varian 23EX linear accelerator.The phantom is located the isocenter point,eccentric 3 cm,eccentric 6 cm,and different points on the z-axis successively on the accelerator.The scanned mode is the standard head mode.The reconstructive thickness is 2.5 cm.The different densities inserts of CTP404 module on the different locations are measured via Eclips treatment planning system (TPS) and computed by Matlab 7.0 and the CT linear fitting are then processed.In order to understand better the linear distribution along with the value of CT in the spatial distribution the results are compared with the fan-beam CT.ResultsPhantom studies show that:CBCT has good linearity performance not only under the standard header (body) of the scanning conditions,but also on such locations including the cross-sectional,the sagittal,the coronal plane and the eccentric position ( R2 ＞ 0.953 ).Bowtie filtration device does not change the CT finearity but changes the value of CT.ConclusionsThe linearity of X-ray CBCT on the Varian linear accelerator is favorable.CBCT will be used in the TPS dose calculation via further correction of the CT value.

Objective To analyze the clinical efficacy and prognosis of stereotactic body radiation therapy (SBRT) for pulmonary oligometastases.Methods Medical records of 104 patients with SBRT for pulmonary oligometastases in our hospital between 2012 and 2018 were retrospectively reviewed.SBRT was performed by intensity modulated radiation therapy (IMRT) technique before December 2015,and by helical tomotherapy (HT) technique in others.The local control (LC),progression-free survival (PFS) and overall survival (OS) were estimated using the Kaplan-Meier method.Cox-regression was used for univariate analyses and multivariate analyses.The radiotherapy-related adverse events were evaluated by NCICTCAE V4.0.Results The 1-,2-and 3-year LC rates were 86.6％,75.9％ and 72.3％,respectively.The 1-,2-and 3-year PFS rates were 40.9％,28.4％ and 22.1％,respectively.The 1-,2-and 3-year OS rates were 75.9％,53.2％ and 43.53％,respectively.The median OS time was 26.6 months.Multivariate analyses showed that the pathologic type of primary tumor,the volume of lung oligometastases and the carcino-embryonic antigen (CEA) level before SBRT were the independent prognostic factors of LC (x2 =28.66,P＜0.05).The way of tumor progression after SBRT was the independent prognostic factor of OS (x2=40.01,P＜0.05).Meanwhile,there were no significant differences in the LC and OS between HTSBRT and IMRT-SBRT.Radiation pneumonitis was the major adverse event of SBRT (n =25,24.04％).Less than 7％ patients experienced grade 2 and above radiation pneumonitis.Conclusions SBRT shows high local control rates and tolerable adverse events in the treatment of pulmonary oligometastases.There were no significant differences in the clinical efficacy and adverse events between HT-SBRT and IMRT-SBRT,which means they are all suitable for clinical application.

Objective To evaluate the clinical efficacy and prognostic factors of stereotactic body radiotherapy(SBRT)for pulmonary oligometastases,and to further explore the patients most suitable for SBRT. Methods From 2012 to 2105,51 patients with 76 oligometastatic lung tumors were treated with SBRT.In those patients,27 had primary lung tumors and the others had extrapulmonary tumors. Seven patients had squamous cell carcinoma,thirty-five had adenocarcinoma, and the rest had other types of cancer. The patients received radiotherapy at a dose of 50 Gy in five fractions or 60 Gy in three fractions. Survival analysis was made by the Kaplan-Meier method. A multivariate analysis was made by the Cox model. Results The 1-and 2-year local control rates were 86%(65/76)and 80%(61/76),respectively. The 1-and 2-year overall survival(OS)rates were 80%(41/51)and 55%(28/51),respectively. The median survival time was 30(2-57)months,while the median progression-free survival time was 8(1-32)months. Twenty-one patients had grade 1 radiation pneumonitis(RP),while one patient had grade 2 RP. The multivariate analysis revealed that no more than 2 oligometastatic lung tumors,progression-free interval(PFI), and a performance score(PS)no higher than 1 were independent factors for OS(all P<0.05). Conclusions SBRT is effective and safe for treating pulmonary oligometastases. The number of oligometastatic lung tumors,PFI,and PS are independent prognostic factors for OS. Suitable patients and the appropriate timing of treatment are key to the efficacy of SBRT.