Objective To investigate the recent effect and safety of magnetic resonance guided focused ultrasound (MRgFUS) for treating uterine fibroids with a Meta analysis. Methods Such databases as Cochrane Library,PubMed,EMbase, CBM,CNKI,CQVIP and Wanfang were searched from their establishment. After thestudy selected, assessment and data extraction conducted by two reviewers independently, Meta-analysis were performed by using the Comprehensive Meta-analysis V2 software. The volume of non-perfusion ratio (NPVR), fibroid shrinkage, clinical symptom severity (SSS score) and adverse reactions were analyzed.Results Nighteen retrieved articles were included, with a total of 1 549 patients. The results of Meta-analysis showed that:(1)nonperfused volume ratio (NPVR),Mean=57.1%(95%CI 45.0% —69.2%).(2)Percentage of FBs shrinkage:mean=31.4% (95% CI 29.2% —33.6%).(3)Symptom severity score (SSS):baseline mean=51.00(95%CI 41.61—60.40),3 months mean=32.50 (95%CI 25.90—39.10),6 months mean=28.62(95%CI(23.57—33.66),12 months mean=24.46(95%CI 15.44—33.49), the average of the severity score of the patient symptoms had a tendency to reduce.(4)The degree of adverse reactions were mild and could relieve itself, there was fewer serious adverse reactions. Conclusions The current evidence indicates that MRgFUS in treatment of uterine fibroidsis reliable and safe. MRgFUS can significantly reduce the volume and the symptom severity score ofthe patients.

Objective To evaluate the value of contrast enhanced MR imaging (CEMRI)for the diagnosis of focal liver lesions with Meta analysis.Methods Relevant English and Chinese language studies were searched on the Pubmed,EMBASE,EBSCO,OV-ID,CNKI,CBM,VIP,WANFANG databases,respectively.Data were calculated with software of STATA 1 1.0 and Meta Disc 1.4. Results 1 7 of 2836 retrieved studies were included,the pooled sensitivity and specificity for CEMRI with 95% confidence interval (95%CI)were 0.85(0.84-0.87)and 0.86(0.84-0.88),respectively,the AUC of SROC was 0.91 6 8.Conclusion CEMRI can be used as one of the primary examination modalities for focal liver lesions with moderate sensitivity and specificity.

Objective To synthesize novel gold nanoparticles of GAL-PEG-GNPs,study its radiation effect on hepatocellular carcinoma cells HepG2 cells in vitro,and investigate the underlying mechanisms.Methods GAL-PEG-GNPs were synthesized and characterized successfully.HepG2 cells were divided into three groups of control,GNPs and GAL-PEG-GNPs.The cytotoxicities of these compounds were tested by the CCK-8 assay and their IC50 values of HepG2 cells were calculated.Cell uptake of nanoparticles was detected by TEM and ICP-MS.The radiosensitization effect of nanoparticles was tested by the colony formation assay.Cell cycle distribution was detected by FCM.The expressions of CAT,SOD,and total GSH were detected with a microplate reader,and the expressions of apoptosis-related proteins were tested by Western blot.Results The GNPs and GAL-PEG-GNPs had absorption peaks at 520 and 530 nm,respectively,and their diameters were (22.6-±2.12) and (32.0 ± 1.41) nm detected by ICP-MS.The GAL-PEG-GNPs and GNPs had similar cytotoxicity profiles (P ＞ 0.05),while GAL-PEG-GNPs could be more effectively uptaken by HepG2 cells than GNPs.The sensitive enhancement ratio (SER) of GNPs and GAL-PEG-GNPs to HepG2 cells were 1.46 和 1.95,respectively.The percentage of cells at phase of G2/M in HepG2 population treated with GNP was higher than that of untreated cells (t =14.20,P ＜0.05).The protein expressions of Cytochrome C,Bax,Caspase-3,and Caspase-9 were upregulated while Bcl-2 expression was down-regulated in the cells treated with GNPs/radiation or GAL-PEGGNPs/radiation.The expressions of CAT,SOD and total GSH in the GNP treated groups were significantly decreased compared with the control group(t =12.34,29.39,12.85,P ＜ 0.05).Conclusions GALPEG-GNPs has obvious radiosensitization effect on HepG2 cells,which is related to the induction of cell apoptosis and the generation of free radicals.

OBJECTIVETo investigate the curative effect of penile elongation with four differentoperative approaches.

METHODSThrough four different operative approaches (the coronary sulcus ringincision, Y or Z shaped incision or Z shaped incision combined with coronary sulcus ring incision), thepenile skin and fascia were degloved until the penile root. Then the superficial and deep dorsal penilesuspensory ligament were cut off. After electric coagulation of the residue ends, the two-side tissue at thefront of the pubic symphysis was sutured. Then the penile skin and fascia were repositioned and the incisionat the inner and outer plate was closed.

RESULTSThe increased penile static length was (2.9 ± 0.2) cmwith abdominal wall Y incision (12 cases); (3.1 ± 0.3) cm with transabdominal modified Z incision (260 cases); (3.9 ± 0.7) cm with coronary sulcus ring incision (363 cases); (3.4 ± 0.8) cm with combined incision (39 cases). The lengthening effect was significantly different between the coronary ring incision and abdominal wall Y/Z incision (P < 0.05). The postoperative follow-up period was 6 months to 5.5 years without serious complications. Only 3 cases of subcutaneous hematoma occurred with treatment of debridement and drainage. 4 cases with ischemic necrosis at distal penile skin, were treated with debridement, dressing and physiotherapy, leaving no scar.

CONCLUSIONSPenile lengthening surgery are safe and effective through different approaches. The coronal ring incision has the best therapeutic effect.

Bandages ; Debridement ; Drainage ; Electrocoagulation ; Fasciotomy ; Follow-Up Studies ; Humans ; Ligaments ; surgery ; Male ; Necrosis ; surgery ; Organ Size ; Penis ; anatomy & histology ; pathology ; surgery ; Postoperative Period ; Reconstructive Surgical Procedures ; methods ; Skin ; Time Factors

Photodynamic therapy(PDT)is a new type of minimally invasive treatment in recent years.After the photosensiti-zer is injected into the body for a period of time,it specifically accumulates in the tumor tissue.At this time,the tumor tissue site is ir-radiated with light of a specific wavelength and the photosensitizer occurs photodynamic reaction to kill tumor cells.With the continu-ous progress of endoscopic guidance technology and the emergence of new photosensitizers,PDT has made significant progress in the treatment of gastrointestinal malignancies and the curative effect is remarkable.This article describes the principle of PDT,and focuses on the application of PDT in gastrointestinal cancer for clinical treatment and research as a reference.

Background: Previous studies showed neurography and tractography of the greater occipital nerve (GON). The purpose of this study was determining diffusion tensor imaging (DTI) parameters of bilateral GONs and dorsal root ganglia (DRG) in unilateral cervicogenic headache as well as the grading value of DTI for severe headache. The correlation between DTI parameters and clinical characteristics was evaluated. Methods: The fractional anisotropy (FA) and apparent diffusion coefficient (ADC) values in bilateral GONs and cervical DRG (C2 and C3) were measured. Grading values for headache severity was calculated using a receiver operating characteristics curve. The correlation was analyzed with Pearson’s coefficient. Results: The FA values of the symptomatic side of GON and cervical DRG (C2 and C3) were significantly lower than that of the asymptomatic side (all the P < 0.001), while the ADC values were significantly higher (P = 0.003, P < 0.001, and P = 0.003, respectively). The FA value of 0.205 in C2 DRG was considered the grading parameter for headache severity with sensitivity of 0.743 and specificity of 0.999 (P < 0.001). A negative correlation and a positive correlation between the FA and ADC value of the GON and headache index (HI; r = –0.420, P = 0.037 and r = 0.531, P = 0.006, respectively) was found. Conclusions DTI parameters in the symptomatic side of the C2 and C3 DRG and GON were significantly changed. The FA value of the C2 DRG can grade headache severity. DTI parameters of the GON significantly correlated with HI.

Objective To investigate the effect of exosomes secreted from human lung adenocarcinoma A549 cells under hypoxic or normoxic conditions on the radiosensitivity and invasiveness of normoxia cells.Methods A549 cells were cultured in hypoxic (1％ O2) and normoxic (21％ O2) conditions,respectively.The exosomes (N-EXO and H-EXO) secreted from normoxic or hypoxic A549 cells were collected by ultracentrifugation and its number was measured using a NanoSight detector.The appearance and size distribution of exosomes were observed by a scanning electron microscopy.The exosomal marker protein CD63 was measured by Western blot.The proliferation of cells exposed to X-rays under hypoxic or normoxic conditions were detected by CCK8 assay.The cell uptake situation of exosomes labeled with PKH67 was observed by a fluorescence microscopy.Cell migration and invasiveness were detected by a cell scratch test and transwell assay.The expression of matrix metalloproteinase 2 (MMP2) and MMP9 was detected by ELISA.Cellular radioresistance effect of exosomes was evaluated by a colony formation assay.Results The NanoSight measurement showed the number of exosomes in cell culture medium was increased after hypoxia treatment.The H-EXO and N-EXO showed typical ring cake shape.The size distribution of H-EXO was mainly between 30 nm and 200 nm,smaller than that of N-EXO (50-220 nm).Western blot assay showed that CD63 was expressed in both H-EXO and N-EXO.At 4 and 6 days after 2 Gy X-rays irradiation,cell proliferation rate of hypoxia A549 cells was significantly higher than that of normoxia cells.The green fluorescent marker of exosomes,PKH67,was distributed inside of the cell.Cell scratch test showed that the width of H-EXO group was much smaller than that of N-EXO group at 12,24 and 48 hours after exosomes treatment (t =2.96,6.76,3.35,P ＜ 0.05).Transwell assay showed that the number of transmembrane cells in the H-EXO group was more than that in the N-EXO group and the control group (t =4.84,7.88,P ＜ 0.O1).The expression levels of MMP2 (t =4.70,3.21,P＜0.05) and MMP9 (t =5.61,3.76,P＜0.05) in the supernatant of H-EXO group were significantly higher than those in the control and N-EXO groups.Cell survival assay showed that the D0 values of control,N-EXO and H-EXO group were 2.614,2.552 and 4.50 respectively,indicating that H-EXO could enhance radioresistance of A549 cells significantly.Conclusions This study finds that the number of exosomes released from A549 cells was increased under hypoxic condition but its size becomes smaller than that under normoxia.Hypoxic exosomes can promote the migration of normoxia cells andenhance cell radioresistance as well.

Objective To evaluate the value of dynamic contrast-enhanced MRI (DCE-MRI)in diagnosing benign and malignant solitary pulmonary nodule (SPN)with Meta-analysis.Methods The databases including PubMed,EBSCO,Cochrane Library,Ovid, CBM,VIP,Wan Fang Database and CNKI were searched to select the literatures about the diagnosis of SPN with DCE-MRI.Inclusion criteria were established,according to the validity criteria for diagnostic research published by the Cochrane Methods Group on Screening and Diagnostic Tests .Methodological quality was assessed by using the quality assessment of diagnostic studies (QUADAS-2)instrument.Meta-analysis was performed by Stata 12.0 and Meta-Disc 1.4.According to the results of heterogeneity of the included articles,proper effect model was selected to calculate the pooled sensitivity,specificity,positive likelihood ration,negative likelihood ration,and diagnostic odds ratio.Summary receiver operating characteristic (SROC)curve was drawed and the area under the curve (AUC)was calculated.Results A total of 17 studies involving 1255 lesions were included.The results of Meta-analysis showed the pooled sensitivity,specificity,positive likelihood ration,negative likelihood ration,and diagnostic odds ratio were 0.95,0.81,4.9,0.06 and 85,respectively.The AUC of SROC was 0.97.Conclusion DCE-MRI has relatively high sensitivity and specificity in the differential diagnosis of benign and malignant SPN.

BACKGROUND:Myocardial infarction is one of the most serious cardiovascular diseases at present,and the existing clinical treatment options such as thrombolytic therapy,percutaneous coronary intervention and coronary artery bypass grafting cannot fully restore the myocardial damage caused by ischemia.Stem cell-derived exosomes for the treatment of myocardial infarction have been a hot research topic in recent years,but the low yield of natural-derived exosomes,the difficulty and time consuming nature of obtaining them,and the poor homing effect have limited their clinical application.In this context,the construction of artificial exosomes as an alternative to natural exosomes has become an effective strategy to solve the above problems. OBJECTIVE:To expound the research status of artificial exosomes in the treatment of myocardial infarction,and classify them into two design modes:semi-artificial and full-artificial,and discuss the research progress and problems of the two modes,finally,make the evaluation and prospect of its clinical application in the future. METHODS:PubMed and CNKI were searched for relevant articles with"artificial exosomes,myocardial infarction,engineering"in Chinese,and"artificial exosome,hybrid exosome,myocardial infarction,nanoparticle,drug delivery system"in English.The focus of the search was from January 2017 to December 2022,and some of the classic forward literature was included.A preliminary selection was conducted through reading titles and abstracts.Repetitive studies,low-quality journals and irrelevant articles were excluded.Finally,73 articles were included for review. RESULTS AND CONCLUSION:(1)By semi-artificially modifying exosomes,whether it is the modification of targeting peptides,hybridization of biofilms or the assistance of magnetic substances,traditional exosome therapies with insufficient targeting and low retention rate and easy to be cleared by the reticuloendothelial system have improved the efficiency of traditional exosome therapy for myocardial infarction.However,these strategies have problems such as unclear modification efficiency,medical ethics,and biotoxicity.(2)Fully artificial bionic exosomes have a higher degree of design freedom compared to exosome modification,which can solve the problems of high extraction and storage difficulties of exosomes of natural origin and limitations of large-scale production;however,this artificial exosome strategy still lacks reliable preclinical data support and biosafety testing,and has not yet formed a standardized process required for large-scale production;therefore,before applying to the clinic,the artificial exosome solution as an alternative to natural exosomes still needs continuous in-depth research by researchers.

BACKGROUNDSeveral previous studies have shown that diffusion-weighted imaging (DWI) can provide additional information for focal pancreatic lesions by demonstrating more restricted diffusion in solid malignant tumors than in chronic pancreatitis, which can be indicated by a decreased apparent diffusion coefficient (ADC). However, these studies have a modest sample size and convey inconclusive results. The aim of this study was to determine, in a meta-analysis, the diagnostic performance of quantitative diffusion-weighted magnetic resonance imaging in distinguishing pancreatic carcinoma from mass-forming chronic pancreatitis.

METHODSWe determined the sensitivities and specificities across studies. A summary receiver operator characteristic (sROC) curve was constructed to calculate the area under the curve (AUC).

RESULTSThe pooled sensitivity of DWI was 0.86 (95% CI: 0.80-0.91) and the pooled specificity was 0.82 (95% CI: 0.72-0.89). The AUC of the sROC was 0.91 (95% CI: 0.88-0.93).

CONCLUSIONSDWI may be a potentially technically feasible tool for differentiating pancreatic carcinoma from mass-forming chronic pancreatitis. However, large-scale randomized control trials are necessary to assess its clinical value.

Diffusion Magnetic Resonance Imaging ; methods ; Humans ; Pancreatic Neoplasms ; diagnosis ; Pancreatitis, Chronic ; diagnosis