Secure and Efficient Two-Factor User Authentication Scheme with User Anonymity for Network Based E-Health Care Applications

Benefited from the development of network and communication technologies, E-health care systems and telemedicine have got the fast development. By using the E-health care systems, patient can enjoy the remote medical service provided by the medical server. Medical data are important privacy information for patient, so it is an important issue to ensure the secure of transmitted medical data through public network. Authentication scheme can thwart unauthorized users from accessing services via insecure network environments, so user authentication with privacy protection is an important mechanism for the security of E-health care systems. Recently, based on three factors (password, biometric and smart card), an user authentication scheme for E-health care systems was been proposed by Amin et al., and they claimed that their scheme can withstand most of common attacks. Unfortunate, we find that their scheme cannot achieve the untraceability feature of the patient. Besides, their scheme lacks a password check mechanism such that it is inefficient to find the unauthorized login by the mistake of input a wrong password. Due to the same reason, their scheme is vulnerable to Denial of Service (DoS) attack if the patient updates the password mistakenly by using a wrong password. In order improve the security level of authentication scheme for E-health care application, a robust user authentication scheme with privacy protection is proposed for E-health care systems. Then, security prove of our scheme are analysed. Security and performance analyses show that our scheme is more powerful and secure for E-health care systems when compared with other related schemes.     

发酵乳增效治疗幽门螺杆菌的Meta分析

目的：系统评价发酵乳联合常规治疗方案清除幽门螺杆菌(Helicobacter pylori,H. pylori)感染的临床疗效。 方法：通过检索Pubmed,Embase,中国知网,中国生物医学文献数据库,万方知网和维普等数据库,收集各数据库建库至2015年2月间与发酵乳辅助治疗H. pylori感染相关研究的随机试验或半随机对照试验,分析根除率与不良反应发生率的合并RR值,并进行亚组、敏感性分析和发表偏倚检测。结果：共纳入9项(1 644例)研究,发酵乳联合常规根除疗法与单独常规根除疗法H. pylori根除率分别为79.5%和67.0%,其合并RR为1.186(95%CI: 1.118~1.257)。总不良反应发生率的合并RR为0.706(95%CI: 0.373~1.340)。结论：益生菌可提高常规疗法对H. pylori的根除率,但不能有效降低不良反应的发生风险。     

基于同源重组和反向PCR扩增技术构建BRD7溴区结构域缺失突变体

目的：利用同源重组和反向PCR扩增技术构建溴区包含蛋白7 (bromodomain-containing protein 7,BRD7)的溴区结构域(bromodomain)缺失的真核表达载体。方法：设计一对反向PCR引物,以预先构建好的pIRES2-EGFP-3Flag/BRD7质粒为模板,利用高保真酶的高保真性和较长的延伸能力,反向扩增出BRD7溴区结构域缺失突变体(pIRES2-EGFP-3Flag/BRD7△brd)的线性DNA片段,然后转化大肠杆菌,利用大肠杆菌同源重组修复能力即可自身环化,而不需要经连接酶连接或其他处理即可得到pIRES2-EGFP-3Flag/BRD7△brd重组表达质粒,通过测序和Western印迹进一步对该缺失突变体的序列和蛋白质表达性能进行验证。结果：通过酶切鉴定、测序和Western印迹证实pIRES2-EGFP-3Flag/BRD7△brd构建成功。结论：利用PCR反向扩增和同源重组技术,可以简便快速地构建pIRES2-EGFP-3Flag/BRD7△brd突变体,实验成本较低,并且发现质粒模板浓度会影响载体的同源重组效率,这种改进的技术可广泛应用到基因突变体的构建。     

CXCR4及NDRG1蛋白在前列腺癌中的表达及其与侵袭转移的相关性分析

目的 探讨趋化因子受体4(chemokine receptor 4, CXCR4)及N-myc下游调节基因1(N-myc downstream regulated gene 1, NDRG1)在前列腺癌组织及细胞系中的表达情况,明确其与前列腺癌恶性程度及转移的关系。 方法 应用免疫组织化学方法检测CXCR4蛋白在前列腺癌(46例)、良性前列腺增生(15例)及正常前列腺组织(10例)中的表达,分析其与前列腺癌病理分级及转移的关系。免疫印迹(Western blotting)法检测不同前列腺癌细胞系中CXCR4及磷酸化NDRG1(pNDRG1)表达差异。结果 免疫组织化学检测发现CXCR4蛋白在前列腺癌组织(30例)中过度表达,表达率为65.2%,其表达水平与前列腺癌病理分级及Gleason评分无显著相关性(P=0.081),而CXCR4蛋白表达与肿瘤转移密切相关,前列腺癌转移患者表达率明显高于无转移患者,差异有统计学意义(P=0.002)。Western blotting法检测在正常前列腺上皮细胞和不同前列腺癌细胞系中CXCR4及NDRG1蛋白表达不同,高转移潜能的去势抵抗前列腺癌细胞(PC3和DU145)中CXCR4表达较高,而作为转移抑制因子的pNDRG1表达则明显降低。结论 趋化因子受体CXCR4及转移抑制因子NDRG1可能参与调控前列腺癌的进展和转移,对前列腺癌的临床诊断和治疗有重要价值。     

中医藏象辨证法辨治三阴性乳腺癌

吴承玉教授创建藏象辨证理论体系,将藏象辨证应用于三阴性乳腺癌的辨治,通过病证结合,从症辨证,明辨病位,详审病性,使复杂难治的三阴性乳腺癌的辨证更为简便、精准。肝、脾、肾是三阴性乳腺癌的重要病位,气滞、痰、瘀、火毒是三阴性乳腺癌的重要病性。运用藏象辨证原理指导三阴性乳腺癌的治疗,病证结合施治,使三阴性乳腺癌的中医治疗更为有效。      

血清HE4、CA125、VEGF联合检测对卵巢癌诊断价值分析

目的 探讨血清人附睾蛋白4（HE4）、癌抗原-125（CA125）、血管表皮生长因子（VEGF）联合检测对卵巢癌诊断价值,为临床诊断提供一定的参考价值。方法 本研究病例来源于2013年5月~2015年5月期间笔者医院收治的107例卵巢疾病患者,按照术后病理结果将其分为卵巢癌组43例与良性病变组64例。选择同期于笔者医院体检中心体检的健康女性50例作为健康对照组。检测各组血清HE4、CA125、VEGF水平变化及联合检测敏感度和特异性。结果 卵巢癌组和卵巢良性病变组血清HE4水平明显高于健康对照组（P<0.05）;卵巢癌组血清HE4水平明显高于卵巢良性病变组（P<0.05）;卵巢癌组和卵巢良性病变组血清CA125水平明显高于健康对照组（P<0.05）;卵巢癌组血清CA125水平明显高于卵巢良性病变组（P<0.05）;卵巢癌组和卵巢良性病变组血清VEGF水平明显高于健康对照组（P<0.05）;卵巢癌组血清VEGF水平明显高于卵巢良性病变组（P<0.05）;血清HE4+CA125+VEGF联合检测敏感度和特异性明显高于单检测血清HE4、CA125、VEGF（P<0.05）。结论 血清HE4、CA125、VEGF在卵巢癌患者中呈高表达,3种肿瘤标志物联合检测具有着较高的敏感度和特异性,可作为诊断卵巢癌的重要手段,具有重要研究价值。     

再治疗根管粪肠球菌生物膜形成与临床表现相关性分析

目的检测粪肠球菌形成生物膜的能力,探讨其生物膜形成能力与临床表现之间的关系。方法采用96孔板法形成生物膜,结合结晶紫染色,检测临床样本中分离的53株粪肠球菌形成生物膜的能力,分析其生物膜形成能力与患牙临床表现之间的关系。结果53株粪肠球菌中,40株（75.47%）具有生物膜形成能力;在患牙的多种临床表现中,瘘道与再治疗根管粪肠球菌生物膜形成具有相关性,结果具有统计学意义（P＜0.05）。结论再治疗根管中,无瘘道的患牙分离出来的粪肠球菌生物膜形成能力强于有瘘道的患牙,临床治疗中应予以注意。     

Clinical investigation of prostate carcinoma in the Third Teaching Hospital of Norman Bethune University of Medical Sciences

Clinical and statistical investigations were performed on 157 patients with prostate carcinoma in the Third Teaching Hospital, Normal Bethune University experienced between January, 1950 and June, 1986. The number of patients with prostate carcinoma among other hospitalized patients showed a recent gradual increase. The patient's age at the time the disease was first diagnosed was most frequently between 60 and 69 years old with an average age of 63.3 years. Dysuria was the most prominent symptom, followed by frequency, retention and macroscopic hematuria. Duration between initial symptom and diagnosis was one to two years in most patients. The prostatic abnormality could be detected by rectal examination in all patients. Elevation of serum acid phosphatase was found in 24.4%. Such elevation was evident in 52.2% of the patients with metastatic lesions, compared to 14.4% of those without metastasis. Fourteen patients had metastasis to bone (8.9%), 13 to lymph nodes, 2 to lung and one to liver. According to the staging diagnosis, 19 patients (12.1%) had stage A, 78 patients (49.7%) had stage B, 20 patients (12.7%) had stage C and 40 patients (25.5%) had stage D carcinoma. Histological findings in 57 patients indicated adenocarcinomas; 39 cases (68.4%) were poorly differentiated, 12 cases (21.2%) were moderately differentiated and 6 cases (10.5%) were well differentiated. Modality of treatment was total prostatectomy in 2 cases (1.3%), antiandrogen therapy (orchiectomy and/or Stilbestrol) in 122 cases (77.7%), subcapsular prostatectomy in 7 cases (4.5%), symptomatic treatment in 5 cases and no treatment in 23 cases (14.6%).     

视网膜脱离合并脉络膜脱离的超声波诊断分析

目的研究视网膜脱离合并脉络膜脱离的超声波诊断特征,为临床诊断提供依据。方法采用法国产ＢＶＩ（ＴｈｅＶ—ｐｓｌｓ）眼科专用Ａ、Ｂ两用超声波扫描仪,对１２例视网膜脱离合并脉络膜脱离的患者进行观察。结果所有病例均在玻璃体暗区前部见到形态不一的半环状或球形回声带,其中５例为多个半环状强回声带;４例为单球形或双球形强回声带;３例为局部扁平状强回声带。结论超声波检查有助于对该病的诊断及鉴别诊断。     

基于蒙特卡罗方法的脑转移瘤术中放疗施照器设计及剂量学评估

目的 设计适用脑转移瘤术中放疗的施照器并评估其剂量学特征。方法 施照器设计首先通过模拟计算电子束经过一系列不同厚度散射箔后的散射角和剂量率,确定散射箔厚度;其次,建立散射箔位于不同高度的位置评估模型,通过计算模型表面平均能量方差,确定散射箔位置;最后,建立调节层几何结构特征与施照器表面剂量之间的关系,确定调制器的内表面特征。使用蒙特卡罗（MC）EGSnrc/BEAMnrc和EGS4/DOSXYZ程序完成Mobetron加速器、位置评估模型、调节层、施照器建模和剂量学分析。结果 半球囊状施照器的限光筒直径为2.5 cm、筒壁厚0.5 cm,材料为0.2 cm厚水等效材料加0.3 cm厚不锈钢;散射箔厚度0.14 cm,材料为金属钨,位置高度为0.5 cm;调制器为月牙形,材料为水等效材料。该施照器能够使Mobetron 12 MeV的电子束产生半球面剂量分布,剂量率为160 cGy/min,治疗深度为0.85 cm。结论 采用MC模拟设计的适用于高能电子束的半球囊状施照器,能产生半球面剂量分布。