Objective To explore the application and problems of using high pressure injection combine detaining needle in cere‐bral thrombosis on CT angiography in rabbit models .Methods 38 rabbit models were divided to experimental group and control group (19 cases each) .Rabbits in the experimental group were injected contrast medium into rabbit ear marginal vein with detaining needles and connected high pressure injection and the control group used intravenous infusion combined high pressure injection . Then observe the CT image quality and infusion outcome in two groups .Results There were 18 cases (94 .74% ) in the experimen‐tal group obtained successful infusion and excellent image quality ,and 13 cases (68 .42% ) in the control group got excellent image , the difference has statistical significance (Z = - 2 .099 ,P = 0 .036) .All of the images of experimental group showed thrombosis clearly .Conclusion High pressure injection combine detaining needle on CT angiography can increase test efficiency ,simplify the operation sequence and achieve evaluating goals .

Objective To explore the influence of pelvis obliquity in lateral position to acetabular component orientation during total hip arthroplasty (THA),and the method to correct.Methods Fifty patients (62 hips) were performed THA with posterolateral incision in lateral position by the same team.The patients were randomized and divided into experimental group (EX,with 25 cases,34 hips) and control group (CON,with 25 cases,28 hips).In EX group,the acetabular components were placed by means of the gradienter and plumb correcting technique during THA.While in CON group,the acetabular components were placed by traditional method during THA.The acetabular abduction angles were measured postoperatively,and compared between the two groups.Results The average obliquity of pelvis was-1.647°±4.512°in EX group when putting the patient in lateral position before correcting.Through the application of gradienter and plumb,the average abduction angle of acetabular component was 42.685°±3.355° postoperatively,with the difference of 1.962°±1.515° compared with the preoperative angles.And in CON group,the average abduction angle of acetabular component was 44.534°±4.844° postoperatively,with the difference of 4.244°±3.042°.The difference of abduction angle in CON group was much higher than that in EX group (P＜0.05).Conclusion The pelvic obliquity when putting the patient under lateral position will affect the surgeons'judgments of placing acetabular component during THA,furthermore,lead to inconsistency among the abduction angles obtained preoperatively,intraoperatively and postoperatively.By applying the correcting method with gradienter and plumb,the discrepancy can reduce obviously between the abduction angle measured postoperatively and that of measured during operation comparing with traditional method.

BACKGROUND: The goal of this study was to create a biomaterial which combines concentrated growth factor (CGF) with an adipose-derived stem cell (ADSC) sheet to promote the repair of skull defects in rats. METHODS: We determined the optimal concentration of CGF extract by investigating the effects of different concentrations (0, 5%, 10%, and 20%) on the proliferation and differentiation of ADSCs. Then we created a complex combining CGF with an ADSC sheet, and tested the effects on bone repair in four experimental rat groups: (A) control; (B) ADSC sheet; (C) CGF particles; (D) combination of CGF ? ADSCs. Eight weeks after the procedure, osteogenesis was assessed by micro-CT and hematoxylin and eosin staining. RESULTS: We found that the concentration of CGF extract that promoted optimal ADSC proliferation and differentiation in vitro was 20%. In turn, bone regeneration was promoted the most by the combination of CGF and ADSCs. CONCLUSION In this study, we determined the optimal ratio of CGF and ADSCs to be used in a biomaterial for bone regeneration. The resulting CGF/ADSCs complex promotes maxillofacial bone defect repair in rats.

BACKGROUND: The goal of this study was to create a biomaterial which combines concentrated growth factor (CGF) with an adipose-derived stem cell (ADSC) sheet to promote the repair of skull defects in rats. METHODS: We determined the optimal concentration of CGF extract by investigating the effects of different concentrations (0, 5%, 10%, and 20%) on the proliferation and differentiation of ADSCs. Then we created a complex combining CGF with an ADSC sheet, and tested the effects on bone repair in four experimental rat groups: (A) control; (B) ADSC sheet; (C) CGF particles; (D) combination of CGF ? ADSCs. Eight weeks after the procedure, osteogenesis was assessed by micro-CT and hematoxylin and eosin staining. RESULTS: We found that the concentration of CGF extract that promoted optimal ADSC proliferation and differentiation in vitro was 20%. In turn, bone regeneration was promoted the most by the combination of CGF and ADSCs. CONCLUSION In this study, we determined the optimal ratio of CGF and ADSCs to be used in a biomaterial for bone regeneration. The resulting CGF/ADSCs complex promotes maxillofacial bone defect repair in rats.

Objective:To verify the predictive value of fully-automated 3D volume segmentation of CT images for the overall survival prognosis of resectable pancreatic ductal adenocarcinoma (PDAC).Methods:From July 2018 to March 2019, the clinical data of 198 cases of resectable PDAC were continuously collected in the First Affiliated Hospital of Naval Medical University. According to the level of carbohydrate antigen(CA)19-9 and carcinoembryonic antigen(CEA), the patient were divided into low CA19-9 group(≤210 U/ml ), high CA19-9 group (>210 U/ml ), normal CEA group (<5 ng/ml ) and high CEA group (≥5 ng/ml). Using our fully-automated segmentation tool developed in the early stage, images at the plain phase and portal phase were matched to those at the late artery phase by taking the artery phase as the matching target to establish UNet model; and the PDAC tumor and pancreatic glands were three-dimensionally segmented to estimate the tumor 3D volume. Univariate and multivariate logistic regression analysis were performed to compare the tumor 3D volume with the common preoperative risk factors (tumor 2D long diameter, CA19-9 level, CEA level, etc.) in predicting the patients′ survival. C-index was used to estimate the accuracy for predicting the survival. Receiver operating characteristics curve (ROC) was drawn and AUC was calculated to evaluate the accuracy for predicting the 1-year and 2-year overall survival and the influence of CA19-9 and CEA level on the patients′ overall survival.Results:Univariate logistic analysis showed that age, tumor 3D volume, tumor location, CA19-9 and CEA level were correlated with the patients′ overall survival. Multivariate logistic analysis showed that tumor 3D volume, CA199 and CEA were correlated with the overall survival. Among them, tumor 3D volume was most strongly correlated with the overall survival ( HR=2.25, 95% CI1.49-3.39, P<0.0001). The prognostic C-index of automatic 3D tumor volume, tumor long diameter, serum CEA and CA19-9 was 0.667(95% CI0.617-0.717), 0.637(0.583-0.691), 0.593(0.527-0.659) and 0.585(0.526-0.644), respectively. The AUCs of 3D tumor volume, tumor location, tumor long diameter, serum CEA and CA19-9 for predicting 1-year and 2-year survival were 0.726 and 0.698, 0.562 and 0.562, 0.703 and 0.660, 0.583 and 0.624, 0.602 and 0.609 respectively. C-index and AUC of tumor 3D volume was significantly better than those of the other common preoperative risk factors, and the difference was statistically significant (all P value <0.05). The survival of patients with large tumor 3D volume was greatly poorer than that of patients with small tumor 3D volume in low CA19-9 group, high CA19-9 group, normal CEA group and high CEA group, and the differences were all statistically significant ( HR=2.27, 95% CI 1.39-3.72; HR=2.42, 95% CI1.23-4.74; HR=2.08, 95% CI1.07-4.06; HR=2.67, 95% CI1.63-4.38, all P value <0.01). And the automatic 3D volume was the strongest predictor for the survival in high CA19-9 group. Conclusions:The tumor 3D volume obtained by automatic CT segmentation was an objective and reliable prognostic biomarker, which can supplement the established preoperativel risk factors and was expected to guide the personalized choice of neoadjuvant therapy.

肿瘤浸润性免疫细胞（TIC）参与构成肿瘤免疫微环境，调控肿瘤的生长，并影响患者的生存及抗肿瘤治疗的疗效。 TIC分布模式的类型主要有冷肿瘤型、混合型和间质型。这3种分布类型在免疫细胞的种类、数量与比例和分布位置上呈现明显 的差别。在不同肿瘤、不同个体，甚至同一肿瘤的不同区域之间，TIC分布模式既有差异性也有规律性，既有模式相似但功能相异 的差异性，也有模式不同但功能相近的规律性。TIC分布模式的分型体现的就是其差异性。近来研究发现，利用TIC分布模式可 以预测患者的预后及抗肿瘤治疗的疗效，这体现的就是TIC分布模式的规律性。本文就该领域的研究进展进行综述。

[Abstract] Objective: To detect the expression of CD39 in head and neck squamous cell carcinoma (HNSCC) tisseus, and to analyze its correlation with patients’clinicopathological features and its prognostic significance. Methods: Tissue specimens and case data of 85 patients with HNSCC underwent surgery at Cancer Hospital of Tianjin from May 2012 to December 2013 were collected for this study. Gene chips were obtained from Oncomine database, and HNSCC cell lines SCC15, UM1, and Cal25 were selected for this study. Online analysis was performed to compare the differential expression of CD39 in buccal mucosa (BM) tissues and HNSCC tissues, Western blotting and Immunohistochemistry (IHC) were used to detect the protein expression of CD39 in HNSCC tissues. Spearman’ s correlation analysis was used to study the correlation between the expressions of CD39 and clinicopathological features of HNSCC patients. Both Kaplan-Meier curve analysis and Log rank test were used to analyze the association between the expression of CD39 in HNSCC tissues and the survival of patients, and Cox risk proportional regression model was used to evaluate the relationship between CD39 expression and the risk of relapse. Results: The transcription level of CD39 was obviously up-regulated in HNSCC tissues than in BM tissues (P<0.01), and CD39 expression was detected in HNSCC cell lines SCC15, UM1 and Cal25. Dexamethasone (DXM) could enhance the expression of CD39 in UM1 cells in dose-dependent manner. CD39 was highly expressed in 53 (62.4%) HNSCC patients, which was positively correlated with preoperative chemotherapy (r=0.234, P<0.05). The recurrence-free survival (RFS) of patients with high CD39 expression was significantly shortened (P<0.05), and high CD39 expression was an independent relapse risk factor (HR=2.328, 95%CI=1.091-4.967; P<0.05) for patients with HNSCC. Conclusion: CD39 is DXM-inducively and constitutively expressed in HNSCC. And over-expression of CD39 is an independent predictor of poor prognosis in HNSCC patients, indicating its important role in the progression of HNSCC.