Objective To study the surgical managements for obstructive coleratal carcinoma(OCRC).(Methods) Clinical data of 126 patients with OCRC who underwent surgical treatment between January 1995 and December 2004 were reviewed.Results Thirty-five patients received one-stage right hemicolectomy,ten patients received one-stage resection of transverse colon.forty-eight patients received one-stage left(hemicolectomy),eighteen patients received one-stage resection of left colon or proximal rectum with colostomy followed by two-staged anastomosis.For 15 patients with unresectable lesions,colostomy of transverse colon or sigmoid colon was performed.Seventeen patients(13.5%) experienced postoperative complications.The (operative) mortality was 4.8%(6/126).The 1-year,3-year and 5-year overall survival rate was(95.1)%,52.7% and 38.1%,respectively.Conclusions Proper perioperative period managements and(selection) of surgical techniques are important for better results and lower complications in the treatment OCRC.

Objective To evaluate the detection methods for β‐lactamase in 3 kinds of Staphylococcus aureus to provide the basis for clinical laboratories selecting the best detection method .Methods 40 strains of Staphylococcus aureus were selected .With the BlaZ gene detection result as the gold standard for β‐lactamase detection ,the detection performance of the penicillin zone‐edge deter‐mination ,cloverleaf assay ,nitrocefin‐disk were evaluated .Results 20 strains of Staphylococcus aureus were the BlaZ gene positive detected by PCR and 20 strains were negative .The sensitivity of the penicillin zone‐edge determination method ,cloverleaf assay and nitrocefin‐disk were all 100 .00% and the specificity were 100 .00% .Conclusion Three kinds of β‐lactamase detection method have better sensitivity and specificity .So different laboratory can choose one of the method to detect β‐lactamase of staphylococcus aureus according to the actual situation .

Objective To study the mechanism of RING finger protein 34 ( RNF34 ) involved in innate immunity . Methods Recombinant PCR was used and transient expression of the plasmid was achieved in HEK 293T cells.The cells were stimulated with Sendai virus ( SeV) or N-RIG-Ⅰfor the indicated time while luciferase activity was observed using the dual-luciferase reporter assay kit .Results We constructed the plasmid pcDNA 3-Flag-RNF34 and its three mutations .The study found that when stimulated by SeV , RNF34 could inhibit the activity of NF-κB and IFN-βmore significantly than RNF34-ΔFYVE, RNF34-ΔCID and RNF34-ΔRING.We also found that RNF 34 and its three mutants had similar inhibitory effect when the activation of NF-κB and IFN-βwas stimulated by the N-RIG-Ⅰ.Conclusion RNF34 negatively regulates innate immunity by acting on the RIG-Ⅰ-MAVS signaling pathway .

Objective Accumulating reports have suggested that hepatic stellate cells (HSCs) exhibit immunosuppressive ability and may be responsible for the occurrence and development of hepatocellular carcinoma (HCC).The mechanisms through which HSCs affect T-cell-induced adaptive immune responses and the relationship with the regulatory T cells (Treg cells) were studied.Methods We isolated HSCs from wildtype mice to demonstrate the influence of HSCs on T-cell proliferation and explored their effect on Treg cells through mixed leukocyte reactions (MLRs) in vitro.Results We found that activated HSCs could induce T-cell hyporesponsiveness in adaptive immune response by inhibiting the proliferation of T cells andincreasing the quantity of Treg cells.Conclusion Activated HSCs may lead to hypoergia of T cells in adaptive immune reaction and up-regulate the expression of Treg cells,thus facilitating immunotolarance.

Objective To investigate the effect of BTB/POZ ( broad complex, tramtrack and bric a brac/poxviruses and zinc finger) on proliferation of breast cancer cell lines.Methods The eukaryotic expression plasmid pCMV-HA-BPOZ was constructed by cloning from cDNA of human genome.Western blotting was used to detect the expression of pCMV-HA-BPOZ.Cells growth assay was used to detect the effect of BPOZ on proliferation and colony formation assay was used to detect the effect of BPOZ on cell growth ability.Results Western blotting showed that HA-BPOZ was efficiently expressed in cells.Moreover, the growth ability and proliferation of cells were significantly inhibited in BPOZ overexpressed cells compared with the control cells (both P <0.05).Conclusionp CMV-HA-BPOZ plasmid is constructed.BPOZ can restrain breast cancer cell lines MCF7 and ZR-75-1 cells from proliferating and growing.The results of our study can con-tribute to the study of functions of BPOZ in breast cancer.

Objective:To investigate the correlations between perfused lung volumes, visual scores (using perfusion SPECT/CT) and right-heart catheter (RHC) hemodynamic parameters in patients with chronic thromboembolic pulmonary hypertension (CTEPH).Methods:A total of 51 consecutive CTEPH patients (17 males, 34 females, age (59±12) years) in the First Affiliated Hospital of Guangzhou Medical University between March 2015 and July 2019 were retrospectively analyzed. All patients underwent lung perfusion SPECT/CT imaging and RHC examinations. Perfused lung volumes were determined using threshold-based (15%-85%) segmentation. Visual semiquantitative scoring in each lung segment was performed using Begic method. RHC hemodynamic parameters including pulmonary artery systolic pressure (PASP), pulmonary arterial diastolic pressure (PADP), mean pulmonary artery pressure (mPAP), pulmonary arteriolar wedge pressure (PAWP), pulmonary vessel resistance (PVR), cardiac output (CO), cardiac index (CI) were recorded. Spearman correlation analysis was used to evaluate the correlations between perfused lung volumes, visual scores and hemodynamic parameters.Results:There were significant correlations between perfused lung volumes (30%-70% threshold) and mPAP ( rs values: from -0.414 to -0.302, all P<0.05). Among them, perfused lung volumes under the threshold of 40% and 45% were moderately correlated with mPAP ( rs values: -0.414, -0.412, both P<0.05). Perfused lung volume (40% threshold) was moderately negatively correlated with PASP, PADP ( rs values: -0.402, -0.440, both P<0.05), and slightly negatively correlated with PVR ( rs=-0.352, P<0.05). Visual scores were slightly positively correlated with the PADP ( rs=0.311, P<0.05), while there was no correlation between visual scores and other RHC hemodynamic parameters ( rs values: from -0.201 to 0.275, all P>0.05). Conclusion:Perfused lung volumes based on threshold-based segmentation in lung perfusion SPECT/CT imaging can accurately reflect hemodynamic status and may provide useful information for severity assessment of CTEPH.

Objective To investigate the efficacy of treatment of intracranial venous sinus thrombosis using systemic anticoagulation combined with endovascular intervention.Methods From May 2014 to January 2017,the clinical data of 52 patients with cerebral venous sinus thrombosis diagnosed with DSA and treated with micro catheter thrombolysis at the Department of Neurology,the Second Hospital of Hebei Medical University were analyzed retrospective.The microcatheters were indwelled for 3-14 d.The dosage of urokinase ranged from 10-20 thousand U/h,13 patients were also treated with balloon dilatation,and 1 was also treated with stent-assisted treatment.The results of imaging data and 6-month telephone follow-up were analyzed.The prognosis was evaluated with the modified Rankin scale (mRS) and National Institutes of Health Stroke Scale (NIHSS).Results In 52 patients admitted to hospital,the whole brain DSA showed sagittal sinus thrombosis in 34 cases,transverse-sigmoid sinus transitional zone thrombosis in 31 cases,inferior sagittal sinus thrombosis in 2 cases,straight sinus thrombosis in 3 cases,and cortical vein thrombosis in 14 cases.Angiography before discharge showed complete patency of the venous sinus in 9 cases,most patency in 42 cases,partial patency in 1 cases,the symptoms were relieved,and neurological function scores were improved at discharge in 48 cases.There were no obvious changes in 3 cases,and 1 case aggravated.The mRS and NIHSS scores before and after treatment were compared.The difference was statistically significant (Z =5.45 and 3.03 respectively,all P ＜ 0.05).Forty-eight patients were followed up for 6 months by telephone,no symptoms related to venous sinus thrombosis were found.Three patients died,and 1 died of traumatic intracranial hemorrhage.Conclusions Endovascular intervention is an effective and safe treatment for intracranial venous sinus thrombosis.It can be used as an alternative treatment scheme of internal medicine for patients of ineffective anticoagulation.

The incidence of colorectal cancer is high threatening human health. About 60％～70％cases of CRC are derived from colorectal polyps, which can be treated by endoscopic electrotomy to prevent the possibility of canceration. Therefore, in the prevention and treatment of CRC, the role of screening is of great significance. CRC screening methods include the most commonly used fecal occult blood test ( FOBT ) and the more sensitive fecal immunochemical test (FIT), cost-effective fiber sigmoidoscopy and colonoscopy, CT colonoscopy (CTC), and fecal DNA testing and immature CRC hematology screening. In this paper, the CRC screening technologies were reviewed, including the principles, characteristics and the latest research progress to provide a theoretical basis for the application and development of CRC screening technology.

Objective:To investigate the expression and clinical significance of thymidine kinase 1 (TK1), carcinoembryonic antigen (CEA), carbohydrate antigen (CA) 19-9, CA15-3 and CA72-4 in colorectal tumors.Methods:Enzyme-linked immunosorbent assay (ELISA) and electrochemiluminescence immuno assay (ECLIA) were used to determine the serum TK1 levels and serum CEA, CA19-9, CA15-3, CA72-4 levels in 124 patients with colorectal cancer, 52 patients with colorectal precancerous lesions, 154 patients with benign colorectal lesions, and 106 health subjects. The relationship between serum TK1 and its clinicopathological characteristics in patients with colorectal cancer were analyzed. The diagnostic efficacy of TK1, CEA, CA19-9, CA15-3 and CA72-4 alone and combined detection for colorectal cancer was investigated.Results:The serum expression level of TK1 in patients with colorectal cancer was related to tumor stage, degree of differentiation, lymph node metastasis, distant metastasis and age (all P<0.05), but not related to the patient's gender ( P>0.05). The serum TK1 level decreased sequentially in colorectal cancer patients, precancerous lesions patients, benign lesions patients and healthy subjects. Colorectal cancer patients with high TK1 expression have a shorter survival time. The sensitivity, specificity and accuracy of the combined detection of TK1, CEA, CA19-9, CA15-3 and CA72-4 were 93.5%, 93.0%, and 93.1%, respectively. Conclusions:Serum TK1 is expected to become an independent marker for the diagnosis and prognosis of colorectal cancer. The combined detection of TK1, CEA, CA19-9, CA15-3 and CA72-4 has clinical significance in the diagnosis of colorectal cancer.

Objective To investigate the mechanism of MDM2-p53 signaling pathway in the development of colorectal cancer and correlation between p53 with clinicopathological parameters, so as to further analyze the effect of p53 on prognosis. Methods The colorectal cancer tissues and the adjacent normal tissues from 86 cases of patients with colorectal cancer were collected . The expression of p53 and murine double minute 2 (MDM2) in colorectal cancer and adjacent normal tissues were detected by immunohistochemistry, Western Blot and real-time fluorescence quantitative polymerase chain reaction (RT-PCR). The prognosis of the patients was analyzed by the Kaplan-Meier survival curves. Results The protein expression and the mRNA expression of p53 and MDM2 in colorectal cancer tissues were significantly higher than that in the adjacent non-cancerous tissues (all P<0.01). A positive correlation was observed between the expression of p53 and MDM2 (r=0.785). The expression of p53 in colorectal cancer tissues were correlated well with the degree of tumor differentiation, TNM stage, lymph node metastasis and infiltration depth (all P<0.05). Survival analysis demonstrated that the mean overall survival time in p53 high expression group was (53.92±1.56) months which was significantly lower than that in p53 low expression group of (69.16±3.72) months, and the difference was statistically significant (χ2=14.78, P<0.01). Conclusions The risk and prognosis of colorectal cancer are closely related to the MDM2-p53 signaling pathway. p53 can be used as a potential target for the prognosis and treatment of colorectal cancer.