基于支持向量机的类风湿关节炎早期诊断模型构建及其效果评价

目的构建基于支持向量机(SVM)的类风湿关节炎(RA)早期诊断模型,并评价其预测效果。方法以240例RA患者和180例其他风湿免疫病患者作为研究对象,测定其血清抗环瓜氨酸多肽(CCP)抗体和类风湿因子(RF),采用SVM构建早期诊断模型,并采用五次交叉验证法评价其效果。结果 SVM仿真诊断正确率为85.48%,高于RF(70.71%)和抗CCP抗体(84.05%)。五次交叉验证结果显示,SVM仿真模型诊断RA的灵敏度(Sen)为88.33%、特异度(Spe)为81.67%,MCC值为0.702 65,说明模型性能较好。RF诊断RA的Sen为74.17%,Spe为66.11%,抗CCP抗体诊断RA的Sen为78.75%、Spe为91.11%。三者Sen、Spe比较,P均<0.01。结论成功构建基于SVM的RA早期诊断模型,其对RA的预测效果较好。     

抗环瓜氨酸肽抗体等四种抗体在早期类风湿关节炎诊断中的意义

目的 抗环瓜氨酸肽抗体、类风湿因子（RF）三种分型IgG、IgA及ISM在早期类风湿关节炎诊断中的意义及应用价值。方法 90例血清标本，包括32例早期类风湿关节炎，8例强直性脊柱炎，加例未确诊的早期关节炎，30例健康对照，以酶联免疫吸附法（ELISA）检测抗环瓜氨酸肽（CCP）抗体、类风湿因子（RF）-IgG、RF-IgA、RF-IgM，并随诊9个月。结果 RA组抗CCP抗体、RF-IgG、W-IgA、RF-IgM明显高于其余三组（P〈0．05）。抗CCP抗体对RA诊断的特异性、敏感性、阳性预测值及阴性预测值均明显高于RF-IgG、RF-IgA、RF-IgM的相应指标。结论 抗CCP抗体存在于RA疾病的早期，对早期RA有较好的敏感性和特异性，抗CCP抗体检测有利于RA的早期诊断。     

AKA、CCP、RA33、RF、ESR联合检测在类风湿性关节炎中的应用

目的探讨联合检测血清中抗角蛋白抗体(抗AKA)、抗环瓜氨酸抗体(抗CCP)、抗RA33抗体、类风湿因子(RF)及红细胞沉降率(ESR)在诊断类风湿关节炎(RA)中的应用价值。方法收集该院2014年6月至2015年5月,经确诊的RA患者100例,疑似RA病例60例,对照组经确诊为非RA的其他自身免疫性疾病患者120例,分别用间接免疫荧光法(IFA)检测每组病例中的抗AKA抗体,用ELISA法检测抗CCP抗体和抗RA33抗体,用速率散射比浊法检测RF,用魏氏法检测ESR,并对各个诊断指标的诊断性能进行评价。结果抗AKA抗体、抗CCP抗体、抗RA33抗体、RF及ESR 5种检测指标在RA组中的检出率依次为64.0%、75.0%、44.0%、84.0%和51.0%,5项并联后的检出率(灵敏度)为97.0%,串联后的检测特异度为89.2%;在RA疑似组中5种检测指标的检出率依次为16.7%、31.7%、13.3%、20.0%、15.0%;在对照组中5种检测指标的检出率依次为0.8%、2.5%、1.7%、0.8%和5.8%,5种指标在RA组中的检出率显著高于疑似RA组,差异有统计学意义(P0.001),疑似RA组和对照组相比5种指标的检出率差异有统计学意义(P0.001),5项并联检测的灵敏度为97.0%,显著高于单项检测灵敏度(P0.05),5项串联检测的特异度最高达到100.0%,也显著高于单项检测特异度(P0.05),并联检测的漏诊率最低,阴性预测值最高,串联检测的误诊率最低,阳性预测值最高,并联检测的约登指数最大。结论抗CCP抗体和RF单独检测具有较好的灵敏度和特异度,而5种指标联合检测具有更高的灵敏度和特异度,可以更好地降低漏诊率和误诊率,大大地提高诊断效率,从而对RA的早期诊断具有重要的临床意义。     

阿达木单抗治疗类风湿关节炎的疗效和安全性

目的:评价肿瘤坏死因子α拮抗剂阿达木单抗短期治疗类风湿关节炎(RA)的临床疗效及安全性,同时检测治疗前后类风湿因子(RF)和抗环瓜氨酸肽抗体(抗CCP抗体)滴度的变化,为RA疗效评估寻找新的指标。方法:随机双盲平行试验,纳入40例活动性RA患者,按2∶2∶1的比例被随机分配到试验组或对照组,试验组分为80 mg阿达木单抗+甲氨喋呤(MTX)、40 mg阿达木单抗+MTX两组,对照组为安慰剂+MTX。受试者隔周接受皮下注射阿达木单抗或同等体积的安慰剂,并在试验第0,2,4,8,12周随访,评价疗效及不良事件收集。疗效采用ACR核心标准评定。次要疗效指标包括压痛和肿胀关节数、晨僵时间、疼痛视觉模拟评分(VAS评分)、健康评估问卷(HAQ)和CRP。基线时及12周治疗结束后检测RF、抗CCP抗体。结果:试验组32例,对照组8例。12周后试验组患者ACR20、ACR50和ACR70缓解的比例都显著高于对照组(P<0.01);试验组患者关节触痛数、关节肿胀数、晨僵持续时间、疼痛VAS评分及健康状况问卷(HAQ)、CRP等次要疗效指标均较基线时水平明显降低(P<0.05);试验组RF血清滴度和抗CCP抗体均较基线时水平显...     

PADI4 polymorphisms and the functional haplotype are associated with increased rheumatoid arthritis susceptibility: A replication study in a Southern Mexican population

Rheumatoid arthritis (RA) is a common autoimmune disease with a complex genetic background. The peptidyl arginine deiminase type IV (PADI4) gene has been associated with RA susceptibility in several populations. We addressed the relationship between three exonic PADI4 gene single nucleotide polymorphisms (SNPs) PADI4_89 (rs11203366), PADI4_90 (rs11203367) and PADI4_92 (rs874881) and related haplotypes with RA in a population from Southern México. This study included 200 RA patients and 200 control subjects. The SNPs were evaluated using the polymerase chain reaction-restriction fragment-length polymorphism (PCR-RFLP) technique, and antibodies to cyclic citrullinated peptides (anti-CCP) were measured by enzyme-linked immunosorbent assay (ELISA). In this population, the minor alleles of PADI4_891G, PADI4_901T and PADI4_921G gene polymorphisms were associated with RA susceptibility (OR = 1.34, p = 0.04; OR = 1.35, p = 0.03; OR = 1.34, p = 0.04; respectively). The GTG haplotype was also significantly associated with RA (OR = 2.27 95%CI = 1.18–4.41; p = 0.008), but did not show association with levels of anti-CCP antibodies and clinical parameters. In conclusion, our replication study in a Southern Mexican population suggests that PADI4 individual polymorphisms and the related susceptibility haplotype (GTG) are also genetic risk markers for RA.     

Rheumatoid arthritis (RA)-specific autoantibodies in patients with interstitial lung disease and absence of clinically apparent articular RA

The purpose of this study was to identify rheumatoid arthritis (RA)-related autoantibodies in subjects with interstitial lung disease (ILD) and no articular findings of RA, supporting the hypothesis that RA-related autoimmunity may be generated in non-articular sites, such as the lung. This was a retrospective chart review utilizing clinic databases of patients with ILD to identify cases with lung disease, RA-related autoantibody positivity, and no clinical evidence of articular RA. Four patients with ILD, RF, and anti-CCP positivity and no articular findings of RA were identified. All four patients were male with a mean age at time of diagnosis of ILD of 70 years old. All had a history of smoking. Three patients died within 2 years of diagnosis of ILD and never developed articular symptoms consistent with RA; the final case met full criteria for articular RA several months after stopping immunosuppressive treatment for ILD. RF and anti-CCP can be present in smokers with ILD without clinical evidence of articular RA and in one case symptomatic ILD and autoantibody positivity preceded the development of articular RA. These findings suggest that RA-specific autoimmunity may be generated due to immunologic interactions in the lung and may be related to environmental factors such as smoking.     

两种抗体联合检测在类风湿关节炎诊断中的临床意义

目的探讨抗环瓜氨酸肽(CCP)抗体、抗角蛋白(AKA)抗体联合检测在诊断类风湿关节炎(RA)中的临床意义。方法收集169例RA患者和105例健康体检者血清标本,检测其抗CCP抗体、抗AKA抗体的浓度,并对结果进行统计分析。结果 RA组抗CCP抗体、抗AKA抗体单独检测的灵敏度分别为80.5%、48.5%,联合检测的灵敏度为91.1%;健康体检组抗CCP抗体、抗AKA抗体单独检测的灵敏度分别为8.7%、2.9%,联合检测的灵敏度为17.3%;特异性分别为91.3%、97.1%,联合检测的特异性为82.7%。结论抗CCP抗体、抗AKA抗体都是诊断早期RA的较好指标,联合检测更能提高其灵敏度,能有效提高早期RA的诊断率,降低漏诊率,但特异性偏低。     

四项检测指标对类风湿关节炎的临床诊断价值

目的探讨抗环瓜氨酸肽（CCP）抗体、类风湿因子（RF）、高敏C反应蛋白（hs-CRP）和红细胞沉降率（ESR）检测对类风湿关节炎的临床诊断价值。方法检测75例类风湿性关节炎（RA）患者、45例非RA的风湿病患者和30例健康体检者的血清hs-CRP、ESR、抗CCP抗体和RF水平;比较抗CCP抗体和RF敏感性、特异性、阳性预测值和阴性预示值;测定RA患者的实验室指标。结果RA组和非RA组抗CCP抗体、RF、hs-CRP、ESR明显高于健康对照组（P〈0.01）;RA组抗CCP抗体和RF水平均高于非RA组（P〈0.05）,而RA组的hs-CRP和ESR水平与非RA组无明显差异（P〉0.05）;两者联合检测的特异性和阳性预测值均明显高于单独检测（P〈0.05）;抗CCP抗体阳性的RA患者CRP、ESR均高于阴性者（P〈0.05）。结论 联合检测抗CCP抗体和RF有利于提高RA检测的特异性,对RA的早期诊断有意义;抗CCP抗体对疾病活动的判断有重要意义。