Effects of flattening filter on dosimetry in fractionated stereotactic radiotherapy for brain metastases / 中国辐射卫生

@#<b>Objective</b> To investigate the dosimetric differences between volumetric modulated arc therapy (VMAT) with a flattening filter (FF) and flattening filter-free (FFF) VMAT in fractionated stereotactic radiotherapy for brain metastases. <b>Methods</b> Seventeen patients with brain metastases were divided into FF-VMAT group (VMAT plans with the FF mode) and FFF-VMAT group (VMAT plans with the FFF mode). The two groups were compared in terms of target volume dose parameters (<i>D</i>_98%, <i>D</i>_2% and <i>D</i>_mean), the conformal index (<i>CI</i>), the gradient index (<i>GI</i>), the gradient, normal brain tissue dose parameters (<i>V</i>_5Gy, <i>V</i>_10Gy, <i>V</i>_12Gy and <i>D</i>_mean), monitor units, and beam-on time. <b>Results</b> Compared with the FF-VMAT group, the FFF-VMAT group had significantly lower <i>GI</i> (3.33 ± 0.37 <i>vs</i> 3.27 ± 0.35, <i>P</i> = 0.001), a significantly lower gradient [(0.85 ± 0.20) cm <i>vs</i> (0.84 ± 0.19) cm, <i>P</i> = 0.002], a significantly shorter beam-on time [(177.05 ± 62.68) s <i>vs</i> (142.71 ± 34.59) s, <i>P</i> = 0.001], and significantly higher <i>D</i>_2% [(65.69 ± 2.15) Gy <i>vs</i> (66.99 ± 2.03) Gy, <i>P</i> = 0.001] and <i>D</i>_mean [(58.77 ± 1.60) Gy <i>vs</i> (59.95 ± 1.43) Gy, <i>P</i> <0.001]. There were no significant differences in the <i>CI</i>, the<i> D</i>_98%of the target volume, the <i>V</i>_5Gy, <i>V</i>_10Gy, <i>V</i>_12Gy and <i>D</i>_mean of the normal brain tissue, and monitor units between FFF-VMAT and FF-VMAT. <b>Conclusion</b> FFF-VMAT can better protect the normal tissue around the target volume, reduce the beam-on time, and improve treatment efficiency.

Effect of phantoms with different cavity thickness on dose verificationupper esophageal cancer / 中国辐射卫生

Objective To investigate the dose calculation accuracy of two algorithms in Monaco TPS for self-made phantoms with different cavity thickness, and analyze the influence of phantoms with different cavity thickness on dose verification of upper esophageal cancer. Methods The phantoms with different cavity thickness were placed on the simulated CT positioning machine to scan and acquire images. In Monaco TPS, the irradiation fields with energy of 6 MV, 100 MU and different square field sizes were added to the acquired images. The dose of the cavity of the ionization chamber was calculated by two algorithms, and measured on the accelerator by dosimeter under the same conditions. At the same time, 20 patients with upper esophageal cancer who received dynamic intensity modulation in fixed field were randomly selected and included in the study, and two algorithms were used for dose verification on phantoms with different cavity thickness. The results were statistically analyzed by SPSS 22.0 software. Results The maximum deviations between the calculated values and the measured values were 0.66% and −1.8%, in the calculation of phantoms with different cavity thickness by algorithms of Monte Carlo and Pencil Beam. In Monte Carlo algorithm, the result of RD pair t test is P > 0.05. Paired t test of AD (0 mm, 10 mm), (5 mm, 10 mm) and (10 mm, 20 mm) groups showed no significant difference (P < 0.05). The maximum deviation was 1.1%, and the rest groups were not statisticely significant (P > 0.05); In Pencil Beam algorithm the t test results of RD (0 mm, 20 mm) and (5 mm, 20 mm) pairs were (P < 0.05), the maximum deviation was 0.58%, and the rest groups were (P > 0.05). In AD group, (P < 0.05), the maximum deviation was 2.78%; The paired t test between the two algorithms was (P < 0.05), and the maximum deviations in RD and AD groups were 2.49% and 4.14%, respectively. Conclusion Monte Carlo algorithm has accurate calculation and high gamma pass rate of dose verification, and there is no clinical difference in gamma pass rate of dose verification among phantoms with different cavity thickness, pencil Beam algorithm is not recommended in cavity phantom calculation.

Observation of prolactin and estradiol levels in lactating women in different iodine nutrition areas / 中华地方病学杂志

Objective To observe prolactin (PRL) and estradiol (E2) levels in lactating women in different iodine nutrition areas.Methods According to the recent national water-borne high iodine area survey and the monitoring results of iodine deficiency disorders,the following places were selected,including Nankang,Xinggang and Yingpan towns of Beihai City,Guangxi (water iodine ≤ 10 μg/L,low iodine areas),Yangcheng Township and Jiajiazhuang Township of Fenyang City,Shanxi (water iodine 50-100 μg/L,adaptive iodine areas),Pingyao County and Jicun Town of Fenyang City,Shanxi (water iodine ≥300 μg/L,high iodine areas),and urinary and blood samples were collected in lactating women (n =100,97,123) from the three regions.The urinary iodine concentration was tested by arsenic cerium catalytic spectrophotometry.Serum levels of PRL and E2 were determined by chemiluminescence immunoassay.Results The urinary iodine medians of lactating women were 51.42,283.62,842.31 μg/L,respectively,in the three regions,the difference between the regions was statistically significant (x2 =241.09,P ＜ 0.05);the iodine levels of lactating women in low iodine areas,adaptive iodine areas and high iodine areas were in the state of iodine deficiency (＜ 100 μg/L),sufficient or adequate (200-299 μg/L) and iodine excess status (≥ 300 μg/L),respectively.Serum PRL and E2 levels of lactating women in the three types of areas were 38.81,20.98,16.41 μg/L and 29.57,43.70,45.51 ng/L,respectively.The differences between the regions were statistically significant (x2 =41.54,24.03,P ＜ 0.05).Conclusion With the increase of iodine nutrition level,PRL in lactating women has presented a gradually decreasing trend,E2 is increased.

Effects of NF-κB/p65 siRNA on Apoptosis and Bax Expression in Lung Tumour Cell Xenografts of Nude Mouse / 中国医科大学学报

Objective To investigate the effects of nuclear factor-kappaB(NF-κB)/p65 signaling transduction on the apoptosis and expressions of apoptosis-related genes Bax in nude mouse lung tumour cell xenografts. Methods The nude mice Lewis lung carcinoma cell xenograft model was established,and then the mice were intraperitoneally injected with NF-κB/p65 small interfering RNA(siRNA). The apoptosis of xenografted tumor cells in nude mice was detected by TUNEL assay. Expressions of Bax mRNA and protein were detected by RT-PCR and Western blotting. Results The result of TUNEL assay demonstrated that p65 siRNA evidently evoked cell apoptosis. Compared to the PBS treatment group or the normal control mice,both mRNA and protein expression levels of Bax in tumor xenografts were significantly up-regulated. There were significant differences among three groups(P<0.05). Conclusion NF-κB/p65 subunit may play an essential role in cell apoptosis of Lewis lung tumor.

Effects of high iodine on mRNA expression of thyroid hormone receptor and protein kinase A and sodium iodide symporter in peripheral blood of patients with thyroid diseases during lacatation / 中华地方病学杂志

Objective To observe the effect of high iodine on mRNA expression of thyroid hormone receptor (TSHR),protein kinase A (PKA) and sodium iodide symporter (NIS) in peripheral blood of patients with thyroid diseases during lacatation.Methods A total of 99 breast-feeding women were selected as observation objects in Shanxi Province's sufficient iodine and high iodine areas,and they were divided into case group and control group according to whether suffer from thyroid disease.In high iodine areas,there were 21 patients and 19 healthy controls.In sufficient iodine areas,there were 30 patients and 29 healthy controls.Peripheral blood of all the observation objects was collected,and mRNA expression of TSHR,PKA and NIS was detected by real-time quantitative PCR.Results The case group [median (M):0.099,0.994] and the control group (M:0.240,0.738) in the high iodine areas were respectively compared with the case group (M:3.087,1.127) and the control group (M:1.823,0.842) in the sufficient iodine areas.The TSHR mRNA expression was significantly decreased (Z =-5.034,-4.010,all P ＜ 0.01);the PKA mRNA expression had a downward trend,and the difference was not statistically significant (Z =2.895,-0.343,all P＞ 0.05).The NIS mRNA expression of the case group in high iodine areas (M:0.485) was obviously lower than that of the the case group in sufficient iodine regions (M:2.680,Z=-3.311,P ＜ 0.01).The control group in high iodine areas (M:0.470) was compared with the control group in sufficient iodine areas (M:0.835),and the difference was not statistically significant (Z =-1.882,P ＞ 0.05).The NIS and the TSHR mRNA were positively correlated [correlation coefficient (r) =0.741,P ＜ 0.01];the NIS and the PKA mRNA was also positively correlated (r =0.293,P ＜ 0.01);but the TSHR mRNA was not significantly correlated with the PKA mRNA (r =-0.081,P ＞ 0.05).Conclusion Lactating women may have protected themselves and their babies through TSH-TSHR-cAMP-PKA signaling pathway that regulating iodine levels.

Expression and clinical significance of SIRT-1 and NF-κB in non-small cell lung cancer / 国际肿瘤学杂志

Objective To investigate the expression and clinical significance of silent mating type information regulation 2 homolog-1(SIRT-1)and nuclear factor-κB(NF-κB)in non-small cell lung cancer (NSCLC). Methods The expressions of SIRT-1 and NF-κB were evaluated by immunohistochemistry in 108 selected cases of primary NSCLC and 48 samples of para-carcinoma normal tissue. The relationships of the expressions of SIRT-1 and NF-κB and clinical pathological features were analyzed,respectively. Results Immunohistochemical results showed that the positive expression rates of SIRT-1 and NF-κB in NSCLC tissue were 90. 7%(98 / 108)and 94. 4%(102 / 108),respectively,significantly higher than those in normal lung tissue 4. 2%(2 / 48),16. 7%(8 / 48),χ2 = 108. 237,P = 0. 000;χ2 = 96. 683,P = 0. 000,and the expre-ssion of SIRT-1 and NF-κB showed a positive correlation(r = 0. 480,P = 0. 001). There were significant posi-tive correlations between the expression of SIRT-1 and tumor size(r = 0. 227,P = 0. 018),TNM stage(r =0. 298,P = 0. 002)and lymph node metastasis(r = 0. 280,P = 0. 003),and there was negative correlation between the expression of SIRT-1 and differentiation(r = - 0. 300,P = 0. 002),and there were no correlation between the expression of SIRT-1 and sex,age and histological type in NSCLC tissues. There were significant positive correlation between the expression of NF-κB and TNM stage(r = 0. 256,P = 0. 009)and lymph node metastasis(r = 0. 261,P = 0. 006),and there was negative correlation between the expression of NF-κB and differentiation(r = - 0. 235,P = 0. 013),and there were no correlation between the expression of NF-κB and sex,age,histological type and tumor size in NSCLC tissues. Conclusion The positive expression rates of SIRT-1 and NF-κB in NSCLC tissue are significantly higher than those in normal lung tissue,and they are rela-ted to TNM stage,lymph node metastasis and differentiation,and the former is also related to tumor size. High expression of SIRT-1 and NF-κB may play important roles in the occurrence and development of NSCLC.

Expression and Clinical Significance of Sir2-related Enzymes-1 in Colorectal Cancer / 中国医科大学学报

Objective To investigate the expression and clinical significance of Sir2?related enzymes?1(SIRT1)in colorectal cancer. Methods The expression of SIRT1 was evaluated by immunohistochemistry in 86 selected cases of primary Colorectal cancer and 30 samples of normal rectum tissues besided carcinoma. The relationship of the expression and clinical pathological features were analyzed. Results The positive expression rate of SIRT1 in Colorectal cancer tissue was 88.4%,and significantly higher than in normal rectum tissue besided carcinoma(P<0.001). There were no correlation between the expression of SIRT1 and sex,age and tumor diameter,and significant positive correlation between the expression of SIRT1 and TNM stage (P<0.05),lymph node metastasis(P<0.05),infiltrating depth(P<0.05),and negagtive correlation between the expression of SIRT1 and tumor differentiation(P<0.05). Conclusion The positive expression rate of SIRT1 in colorectal cancer tissue was significantly higher than in normal rectum tissue besided carcinoma and intimate correlation with tumor differentiation,TNM stage,lymph node metastasis and Infiltrat?ing depth. Conclusion SIRT1 may be an important assistance gene to diagnose and judge prognosis,and may improve diagnostic rate and auxiliari?ly judge prognosis as a important Colorectal cancer marker.

Protective Effect of Silymarin on Kidneys of Rats with Type 2 Diabetic Nephropathy / 中国药师

Objective:To evaluate the efficacy of silymarin on type 2 diabetic nephropathy in rats. Methods:Totally 60 male al-bino Wistar rats at the age of 8 weeks were involved in the study, and non-insulin-dependent diabetes mellitus was induced in 45 over-night-fasted rats by intramuscular injection of streptozotocin and nicotinamide. Among the 45 rats, three ones failed to make the model, and forty-two rats with diabetic nephropathy were randomly divided into diabetes control group (DC group), diabetes treated by low dosage silymarin group ( DT-L group) and diabetes treated by high dosage silymarin group ( DT-H group) with 14 cases in each. The dosage of silymarin in DT-L group and DT-H group was 60 mg·kg-1 ·d-1 and 120mg·kg-1 ·d-1 , respectively, and the treatment course was 60 days. The other 15 rats were divided into the normal control group ( NC group) with equal volume buffer solution. The glycosylated hemoglobin, urine volume, serum creatine, serum uric acid, and urine albumin levels were analyzed by the semi-automat-ic biochemial analyzer. Results:At the end of the study, the DC group had significantly higher levels of blood glucose, glycosylated hemoglobin, urine volume, serum uric acid and urine albumin than the NC group (P<0. 05), while the two silymarin-treated groups showed significantly lower levels of the indices than the DC group (P<0. 05). Conclusion:The results show that silymarin has pro-tective effect on kidneys of rats with type 2 diabetes mellitus, which lay foundation for the future clinical application.

Study on the expression of embryonic stem-related genes in pancreatic cancer stem cells and its significance / 中国生化药物杂志

Objective To observe the expression change of embryonic dry related genes in embryonic stem of pancreatic cancer and analyze its significance.Methods Pancreatic cancer cell lines PANC-1 was incubated with with CD24,CD44 antibody incubation,the CD24 + and CD44 +pancreatic cancer stem cells were sorted and pancreatic cancer stem cells' forming speed were observed under a microscope.The differentiation of stem cells were induced by 1640 culture,and the expression of CD24 +and CD44 +were detected by flow cytometry.The expression of embryonic stem cell marker Oct4 and Nano were detected by immunohistochemical and the tolerance difference of Oct4 and Nano cell to chemotherapeutic drugs in vitro were observed and compared by CCK8 method.Results The number of CD24 +and CD44 +isolated from human pancreatic cancer cell lines PANC-1 was 1%~3%.Oct4 and Nano expression in sorted cells were significantly higher than un -sorted cells,and the difference was significant (P<0.05 ). Conclusion CD24 +and CD44 +cells has high drug resistance and other characteristics of pancreatic cancer stem cells,and the expression of embryonic stem-related genes Oct4 and Nano are high pancreatic cancer stem cells.

Efficacy analysis of S-1 plus nedaplatin versus standard second-line chemotherapy in the treatment of advanced lung adenocarcinoma that failure in the first-line chemotherapy / 中国生化药物杂志

Objective To compare the efficacy and safety of S-1 plus nedaplatin and standard second-line chemotherapy in the treatment of advanced lung adenocarcinoma that failure in the first-line chemotherapy.Methods A total of 95 cases with IIIb-IV stage non-small cell lung adenocarcinoma that failure in the first-line chemotherapy was included in this paper and divided into two groups:group A(n=5 1 )was treated with S-1 combined with nedaplatin chemotherapy;group B(n=44)was treated with pemetrexed or docetaxel single-agent chemotherapy,21 days were a cycle of treatment,and totally 4 cycles of chemotherapy. Results The objective response rates(CRR)in group A and group B were 33.0% and 19.3%respectively(P<0.05),and the difference was significant;the clinical benefit rates(CBR)in two groups were 57. 1% and 40.9% respectively (P <0.05 ),and there was significant difference between two groups. The median perfect forward secrecy(PFS)was 99 days and 40 days respectively,and the difference between two groups was significant(P<0.05 ). The one-year survival rates in groups A and B were 5 1.3% and 33.7%(P<0.05 ),and there was significant difference(P<0.05 ). Logistic multi-factor regression analysis showed that the ORR and CER had no correlation with the gender, age, proportion score (PS )and the first-line chemotherapy selection. Conclusion S-1 plus nedaplatin chemotherapy is better than the standard second-line chemotherapy in the treatment of advanced lung adenocarcinoma that failure in the first-line chemotherapy,with the advantage of good tolerance,and it can provide a new choice for the treatment of advanced non-small cell lung adenocarcinoma.

Establishment of a mouse model of orthotopic Lewis lung cancer / 中国实验动物学报

Objective To establish a mouse model of orthotopic Lewis lung carcinoma using Matrigel, to evaluate the tumor growth and metastasis, and to provide a more stable mouse model of orthotopic lung cancer, which is more similar to human lung cancer.Methods Logarithmic phase of cultured Lewis lung cancer cells were suspended in Matrigel, vac-cinated into the left lung of inbred C57BL/6 mice.Five mice were killed on the 4th, 7th, 10th, 13th, and 16th days, re-spectively, and to observe the median survival, tumor formation rate, tumor growth, and metastasis.Pathological changes of the mouse lung, liver, kidney and spleen were examined.Results In 5 mice killed on the 7th postoperative day, small tumor nodules were observed on the lung in three mice and no tumor was visible by gross inspection in the other two mice, but small tumor nodules were observed under the microscope.For all the mice killed on the 10th postoperative day, tumors were visible to the naked eye on the lung of all the five mice.On the 13th day, orthotopic tumor was observed on the lung with bloody pleural effusion and pleural metastasis in all the five mice.On the 25th day, in addition to the pleural metasta-sis, one mouse had pericardial metastasis and renal metastasis.The survival periods of the 5 mice were 17 d, 20 d, 22 d, 22 d, and 25 d, respectively, with a median survival period of 21.2 d (17-25 d), and the tumor formation rate was 100%.Conclusions Mouse models of orthotopic Lewis lung carcinoma is successfully established using injection of tumor cells suspended in Matrigel.This model is more similar to the growth of human lung cancer, with good stability, high tumor formation rate and characteristics of distant metastasis, therefore, is worthy of further application.

Research progress of selective mGluR1 antagonists / 药学学报

As an important member of metabotropic glutamate receptors (mGluR), metabotropic glutamate receptor 1 (mGluR1) plays an important role in the signal transduction of central nervous system. Selective mGluR1 antagonists can block the signaling pathway activated by mGluR1 and exert a series of physiological actions including analgesia, antianxiety, antidepression, etc. Currently, the discovery and modification of selective mGluR1 antagonists have become a hot research focus. This paper reviews the structural catalogs of selective mGluR1 antagonists and their structure-activity relationships in the last decade.

Observation on the clinical effect of postoperative concurrent chemoradiotherapy for high-grade gliomas / 中国基层医药

Objective To compare the efficacy of the therapeutic alliance of radiotherapy and Semustine (CCNU)chemotherapy with radiotherapy alone after partial resection of high-grade sliomas.Methods Forty-nine cases with partial resection of brain gliomas were randomly divided into two groups.In the control group(sole radiotherapy n=19),patients were only treated with local radiotherapy,with the dose of 40Gy/20f/4W,and then added the amount to 61～64Gy/27～28f/5～6W with low fractionation radiotherapy.In the observation group(therapeutic alliance n=23),patients underwent the above mentioned radiotherapy plus six Courses of adjuvant CCNU chemotherapy.Meanwhile,enhanced GD-MRI was performed to evaluate the changes of glioma volume,the nerve function status was evaluated with Karnofsky scale,and record the survival time.Results Twenty-four weeks after radiotherapy,improvements in glioma size and nerve function status of the observation group were superior than that in the control group(all P＜0.05),meanwhile,the long-term survival rate of observation group war also significantly better than that of the control group(P＜0.05).Conclusion Radiotherapy combined with CCNU could increase the glioma remission rate after partial resection,improve the life quality of patients.and extend their survival time.