Objective To investigate the clinical application value of predicting the severity of acute pancreatitis(AP)based on MRI-T2WI radiomics nomogram.Methods A total of 375 patients with AP were analyzed retrospectively,who were divided into 281 cases in the training group and 94 cases in the validation group according to the ratio of 3∶1.Based on MRI-T2WI image,man-ual segmentation was performed for the pancreatic parenchyma.The radiomics feature were selected by feature extraction and dimen-sionality reduction,the support vector machine(SVM)classifier were used to construct the radiomics model.Logistic regression analysis was used to screen out independent risk factors,and an radiomics nomogram model was constructed in combined with the Radiomics score(Radscore),and the predictive performances of the models were evaluated.Results Receiver operating characteristic(ROC)curve analysis showed that the predictive efficacy of radiomics nomogram model[training group,area under the curve(AUC)=0.893;val-idation group,AUC=0.889]was higher than that of clinical model(training group,AUC=0.799;validation group,AUC=0.809)and radiomics model(training group,AUC=0.814;validation group,AUC=0.823).Conclusion The radiomics nomogram based on MRI-T2WI radiomics features and independent risk factors has high clinical application value for the prediction of AP severity.

Postoperative complications of colorectal cancer (CRC) are the main cause of postoperative death and seriously affect the quality of life and survival time of patients. The application of a clinical prediction model for postoperative complications of CRC can help promptly identify high-risk patients. Accordingly, reasonable intervention measures can be actively taken to reduce the incidence of postoperative complications of CRC. A scientific basis can also be provided to improve the prognosis of patients. In this work, literature on the risk-factor analysis and prediction-model construction of postoperative complications of CRC at home and abroad in recent years was collected and reviewed. The evaluation content and efficiency of the clinical prediction models in postoperative complications of CRC were summarized. Their advantages and disadvantages were also analyzed. The purpose of this study was to provide a reference for the subsequent optimization of such models and the development of a strong, clinically practical, and universal risk-screening tool for postoperative complications of CRC.

Objective: The purpose of this study was to investigate the effects of sirolimus ( SIR) on proliferation and apoptosis of vascular endothelial cells of venous malformation ( VM) caused by mutations in TIE2-L914F and its potential molecular mechanism． Methods : The expression of TEK receptor tyrosine kinase ( TIE2 ) in human umbilical vein endothelial cell (HUVEC) was interfered to construct vascular endothelial cells of VM model (TIE2-L914F group) ．Subsequently part of vascular endothelial cells of VM was exposed to 1 000 ng / ml SIR for 48 h (TIE2-L914F + SIR group) ，and the proliferation and apoptosis of vascular endothelial cells of VM were detected by MTT and flow cytometry．The mRNA and protein expressions of CXCL1 and CXCR2 were detected by qRT-PCR and Western blot. Results : Compared with the cells in TIE2-L914F group，the proliferation activity of the cells in TIE2-L914F + SIR group was inhibited，and the apoptosis rate increased (P ＜0. 05) ．The expression of CXCL1 increased in TIE2-L914F cells but decreased after SIR treatment (P＜0. 05) ．Compared with TIE2-L914F + pcDNA3．1 group，the cell proliferation activity increased but apoptosis rate decreased in TIE2-L914F + pcDNA-CXCL1 group．Compared with TIE2-L914F + pcDNA-CXCL1 group，cell proliferation activity was inhibited but apoptosis rate increased in TIE2-L914F + pcDNA-CXCL1 + SIR Group (P＜0. 05) ．In addition，compared with TIE2-L914F group，CXCR2 expression decreased in TIE2-L914F + SIR group(P＜0. 05)． Conclusion SIR inhibits VM cell proliferation，induces cell apoptosis of vascular endothelial cells of VM，and inhibits the expression of CXCL1 / CXCR2.

Gastric cancer is a common cancer in digestive system in China. It′s in the forefront of cancer in terms of morbidity and case fatality, posing a great threat to people′s health. With the advent of the era of precision medicine, the treatment of each patient with gastric cancer must follow the principle of individualization. However, individualized treatment is based on the development of biomarkers. Liquid biopsy has been reported to be a biomarker capable of detecting information about tumorigenesis and progression, and has been suggested as a useful tool for personalized treatment. Compared with traditional "tissue biopsy" , liquid biopsy has significant advantages because it is noninvasive and painless, reduces cost and time for diagnosis, and could be used for diagnosis, prognosis, prediction of disease progression, or as a surrogate marker of response to treatment.For this purpose, the author will review the related detection techniques of liquid biopsy and its role in early screening, efficacy evaluation and recurrence monitoring of gastric cancer.

Objective : To study the correlation between cerebral white matter structure with cognitive function and blood biochemical indexes in patients with end stage renal disease (ESRD) . Methods : The diffusion tensor imaging (DTI) data of 64 ESRD patients and 47 age and sex matched healthy people were collected. Tract⁃based spatial statistics (TBSS) and XTRACT analysis methods were used to compare the differences in diffusion parameters between the two groups. Pearson correlation analysis was used to detect the correlation between various diffusion parameters and blood biochemical indexes and cognitive related scales. Results : The values of FA in the ESRD group generally decreased (P < 0. 05) . The values of MD, AD and RD obviously increased (P < 0. 05) . The scores of mini mental state examination (MMSE) and Montreal cognitive assessment (MoCA) decreased (P < 0. 01), while that of trail making test A part (TMT⁃A) increased (P < 0. 05) . In the ESRD group, the values of FA in the right anterior thalamic radiation, optic radiation, acoustic radiation, and cingulum were negatively correlated with the levels of creatinine and urea nitrogen, and positively correlated with MoCA′s scores, and the values of MD and RD of these tracts were positively correlated with the concentration of urea. The values of FA in optic radiation, acoustic radiation and left temporal of cingulum were negatively correlated with the scores of TMT⁃A. The values of FA in the vertical occipital fasciculus, inferior fronto⁃occipital fasciculus, left middle longitudinal fasciculus and forceps major were negatively correlated with the concentration of creatinine. The values of FA in the left arcuate fasciculus were positively correlated with the MoCA′s score, the values of MD and RD of these tracts were positively correlated with the concentration of creatinine, and negatively correlated with the scores of MMSE and MoCA. The values of FA in the right superior longitudinal fasciculus, the right corticospinal tract and the right frontal aslant tract werepositively correlated with the MoCA′s score, the values of MD and RD of these tracts were positively correlated with the concentration of urea; the values of MD and RD in the left fornix were positively correlated with the level of creatinine and urea. Conclusion The structural integrity of white matter in ESRD patients is extensively damaged, which is significantly associated with a variety of cognitive impairments. Serum creatinine and urea nitrogen may be risk factors for the changes in white matter.

Objective : To study the best machine learning method for early prediction of hematoma expansion in hypertensive intracerebral hemorrhage based on head CT plain scan. Methods : The CT images of 130 patients with cerebral hemorrhage were retrospectively analyzed , and the texture features of the head CT plain scan were extracted. The classifier was trained by selecting the features , and the six classic machine learning methods were crossvalidated to evaluate the stability and performanceof predicting cerebral hemorrhage hematoma expansion. Results: The prediction performance of support vector machine (SVM⁃Radial) (AUC 0. 714 ± 0. 144 , accuracy 0. 723 ± 0. 109) , generalized linear model ( GLM) prediction performance ( AUC 0. 643 ± 0. 125 , accuracy 0. 587 ± 0. 136) , random forest (RF) prediction performance (AUC 0. 686 ± 0. 128 , accuracy 0. 680 ± 0. 130) , k ⁃nearest neighbor (kNN) prediction performance ( AUC 0. 657 ± 7C 15 , accuracy 0. 639 ± 39 performance 19) , gradient boosting tree algorithm (GBM) Prediction performance ( AUC 0. 718 ± 0. 141 , accuracy 0. 670 ± 0. 126) , neural network (NNet) prediction performance (AUC 0. 659 ± 0. 162 , accuracy 0. 680 ± 0. 130) , in which support vector machines showed high prediction performance , generalized linear model showed low predictive performance. Conclusion Among the six machine learning methods based on cranial CT radiomics to predict early hematoma expansion in hypertensive intracerebral hemorrhage , support vector machine (SVM⁃Radial) has the best predictive performance and has potential clinical application value.

Objective To investigate the characteristics of serum lipid levels in centenarians in Hainan province.Methods A total of 899 centenarians were enrolled.Fasting venous blood samples were collected,and serum levels of total cholesterol (TC),triglyceride (TG),low-density lipoprotein cholesterol(LDL-C),high-density lipoprotein cholesterol (HDL-C),apolipoprotein A-1 (Apo A1),apolipoprotein B(Apo B) and lipoprotein (a) [Lp (a)] were determined.Characteristics of serum lipid levels in centenarians with different age and gender were analyzed.Results The ratio of male to female in this study was 1 ∶ 4,101 years of age comprised the largest proportion(20.4 ％,183 cases),and the highest age was 109 years old for men and 116 years old for women.People aged 102 years had the highest levels of TC,TG,LDL-C and Apo B,and also had the lowest levels of HDL-C and Apo A1.Serum levels of TC and LDL-C reached the peak at the age of 102 years and showed downward trends year by year.Serum levels of TC,TG,LDL-C,Apo A1 and Apo B were lower in males than in females(P＜0.01),and HDL-C had no significant difference between males and females(P ＞0.05).The detection rates for abnormal serum lipid levels were higher in females than in males(P＜0.01).Serum Lp(a) level was higher in females than in males.Conclusions Serum lipid levels show a peak expression at a certain age in centenarians of Hainan,and the types and ratio of abnormal blood lipids are higher in female centenarians than in male centenarians.

Objective To study the clinical application value of individualization portal for knee arthroscope meniscoplasty. Methods The clinical data of 100 patients who had underwent knee arthroscope meniscoplasty were retrospectively analyzed. In the patients, 50 cases were performed with routine portal (group A), and other 50 cases were performed with individualization portal (group B). The operation time, curative effect and incidence of complications were compared between 2 groups. Results The operation time in group B was significantly lower than that in group A:(28.8 ± 3.1) min vs. (39.5 ± 5.4) min, and there was statistical difference (t = 12.151, P<0.01). There was no statistical difference in excellent and good rate between group A and group B: 94%(47/50) vs. 96%(48/50),χ2=0.522, P>0.05. The incidence of meniscus and cartilage injury in group B was significantly lower than that in group A: 2% (1/50) vs. 14% (7/50), and there was statistical difference (χ2 = 4.891, P<0.05). There was no statistical difference in incidence of hematoma between 2 groups (P>0.05). There was no ligament injury, infection, vascular and nerve injury, deep vein thrombosis, instrumentation damage and synovial fistula. Conclusions The individualization portal for knee arthroscope meniscoplasty is more convenient. It can shorten operation time and decrease meniscus and cartilage injury. But it has no influence on clinical effect and other complications.

Objective: To analysis the biomechanical and biocompatible properties of calcium phosphate cement (CPC) enhanced by chitosan short nanofibers(CSNF) and Arg-Gly-Asp (RGD). Methods: Chitosan nanofibers were prepared by electrospinning, and cut into short fibers by high speed dispersion. CPC with calcium phosphorus ratio of 1.5:1 was prepared by Biocement D method. The composition and structure of CPC, CSNF, RGD modified CSNF (CSNF-RGD), CSNF enhanced CPC (CPC-CSNF), RGD modified CPC-CSNF (CPC-CSNF-RGD) were observed by infrared spectrum, X-ray diffraction (XRD) and scan electron microscopy (SEM). The mechanical properties were measured by universal mechanical testing instrument. The adhesion and proliferation of MC3T3 cells were assessed using immunofluorescence staining and MTT method. Results: The distribution of CSNF in the scaffold was homogeneous, and the porous structure between the nanofibers was observed by SEM. The infrared spectrum showed the characteristic peaks at 1633 nm and 1585 nm, indicating that RGD was successfully grafted on chitosan nanofibers. The XRD pattern showed that the bone cement had a certain curability. The stain-stress test showed that break strengths were (17.74±0.54) MPa for CPC-CSNF and (16.67±0.56) MPa for CPCP-CSNF-RGD, both were higher than that of CPC(all P<0.05). The immunofluorescence staining and MTT results indicated that MC3T3 cells grew better on CPC-CSNF-RGD after 240 min of culture(all P<0.05). Conclusion: CSNF-RGD can improve the biomechanical property and biocompatibility of CPC, indicating its potential application in bone tissue repair.
3T3 Cells ; Animals ; Biocompatible Materials ; Bone Cements ; chemistry ; metabolism ; pharmacology ; Calcium Phosphates ; metabolism ; Cell Proliferation ; drug effects ; Chitosan ; chemistry ; pharmacology ; Mice ; Nanofibers ; chemistry ; Oligopeptides ; chemistry

Objective To explore the brain function changes in cirrhotic patients with normal blood ammonia and high in direct bilirubin with regional homogeneity (ReHo) of resting-state functional MRI (rs-fMRI).Methods Fifty-three cirrhotic patients with normal blood ammonia and high indirect bilirubin (cirrhosis group) and 60 healthy volunteers (control group) performed rs-fMRI scans.ReHo values in different brain areas of the two groups were acquired and compared.The correlation between the ReHo values of different brain regions in both groups and the indirect bilirubin concentrations was analyzed.Results Compared with control group,cirrhosis group showed that ReHo values increased in left dorsal-lateral frontal gyrus,left orbital superior frontal gyrus,left top edge of angular gyrus,left precentral gyrus,right caudate,right putamen,right insula,right olfactory cortex (all P＜0.001),and decreased in left superior occipital gyrus,left middle occipital gyrus,left cuneus,left orbital inferior frontal gyrus,right paracentral lobule,right precuneus,right middle occipital gyrus,bilateral lingual gyrus and bilateral cerebellum (all P＜0.001).ReHo values in right insula and right putamen in cirrhotic patients positively correlated with indirect bilirubin (r=0.32,P=0.021).Conclusion The resting state brain function increases and decreases in some brain regions of cirrhotic patients with normal blood ammonia and high indirect bilirubin.Indirect bilirubin level correlates with function of some brain regions,which has certain effect on brain function of adult.