Purpose The diagnosis, treatment and prognosis of benign and malignant biliary stricture are significantly different. This study aims to evaluate the quantitative analysis of biliary structures using magnetic resonance cholangiopancreatography (MRCP) combined with dynamic contrast enhanced CT (DCE-CT).Materials and Methods The quantitative parameters of MRCP and DCE-CT imaging data from 27 patients with benign biliary stricture (benign group) and 30 patients with malignant biliary stricture (malignant group) were retrospectively analyzed. The wall thickness, stricture length and diameter, proximal ductal dilatation and degree of enhancement in two groups were compared, and its correlation was analyzed to evaluate the accuracy of MRCP and DCE-CT.Results There were significant differences in wall thickness [(3.2±2.0) mmvs (2.1±0.6) mm], stricture length [(15.8±8.1) mmvs (9.5±6.5) mm] and diameter [0 mmvs (2.0±0.9) mm], proximal ductal dilatation and the degree of enhancement [(12.7±3.6) mmvs (9.3±2.7) mm] between the two groups (t=2.825, 3.270, 4.025,P<0.001;Z=-3.909,P<0.001). Multivariable stepwise regression analysis showed that the wall thickness and diameter, and the CT HU in portal venous and equilibrium phases combined with CT plain scanning were significant predictors of malignant biliary strictures (t=-6.424-2.309,P<0.05). The sensitivity, specificity, inter-modality agreement and Youden index of MRCP and DCE-CT in diagnosing 57 patients with biliary stricture were 96.67%, 100.00%, 98.25% and 0.97, respectively; with statistical significance in predicting benign and malignant biliary stricture (AUC=0.994,P<0.001).Conclusion Using MRCP and DCE-CT, the wall thickness and diameter of the stricture, and the difference in CT HU in portal venous and equilibrium phases combined with CT plain scanning are valuable in differential diagnosis of benign and malignant biliary stricture.

To investigate the transgenic expressing efficacy of helper-dependent adenoviral vector (HDAd) in vitro, we constructed a HDAd encoding enhanced green fluorescent protein (EGFP), denominated as HDAd/EGFP, performed large scale preparation and purification, and then identified the purified HDAd/EGFP under fluorescent microscope and electron microscope. After the concentration of HDAd/EGFP was determined by spectrophotometer, the transgenic expression efficiency of HDAd/EGFP was compared with first generation adenoviral vector encoding EGFP (FGAd/EGFP) in vitro. Therefore, we infected A549 cells with 2000 virus particles (vp) per cell by HDAd/EGFP and FGAd/EGFP respectively and analyzed EGFP expressing level by flow cytometry. Consequently, the fluorescent expression rate and fluorescent intensity of EGFP were higher in early infected A549 cells by HDAd/EGFP than by FGAd/EGFP. HDAd, capable of expressing transgene instantly and efficiently in vitro, is a potential vaccine vector.
Adenoviridae ; genetics ; metabolism ; Cell Line, Tumor ; Genetic Vectors ; genetics ; Green Fluorescent Proteins ; genetics ; Helper Viruses ; genetics ; metabolism ; Humans ; Transgenes ; Viral Fusion Proteins ; genetics ; metabolism

Objective:To summarize the characteristics of the participants (P), interventions (I), control measures (C), outcomes (O) and study design (S) of the clinical study of chronic back pain (CBP) in recent years; To further systematically organize the outcomes of the clinical study of CBP and their corresponding measurement tools.Methods:Clinical studies of CBP were retrieved from various databases including CNKI, Wanfang Database, VIP, SinoMed, Cochrane Library, Pubmed, Embase, Web of Science, etc. The search period was from January 1, 2015 to December 31, 2019. The retrieved literature was extracted and analyzed.The retrieved literatures will be extracted and analyzed. The retrieved literature was subjected to data extraction and analysis, and the quality of outcome indicators was evaluated according to 6 items. The Newcastle-Ottawa Scale ( NOS ) was used to evaluate the quality of cohort studies and case-control studies. Analyze the relationship between outcome indicators and interventions.Results:A total of 3 028 articles were finally included after examination and screening. The top 7 diagnoses of CBP were low back pain, lumbar disc protrusion, lumbar vertebral stenosis, lumbar vertebral slip, lumbar disc degression, non-specific chronic low back pain and post-operative pain syndrome. The top 7 intervention measures in clinical studies of CBP were surgery, acupuncture, physiotherapy, Tuina, exercise therapy, Western medicine painkillers and oral Chinese patent medicines. A total of 47 outcomes and 348 outcome measurement tools were reported in the literature included.Conclusion:In the clinical study of CBP in the recent years, there are problems such as incomplete and low quality of reporting, a wide variety of outcome measurement tools and lack of uniform reporting standards. The characteristics of patients determine the common characteristics of outcomes selection and it is also necessary to consider the specific outcomes related to interventions.