乙肝病毒基因型对武汉地区慢性乙型肝炎患者干扰素α-2b疗效的影响

目的:探讨武汉地区慢性乙型肝炎(CHB)患者HBV基因型对干扰素α-2b疗效的影响。方法:以患者年龄、性别、基线指标进行匹配,按照基因分型结果分组,比较干扰素治疗48周时的应答情况。结果:在治疗48周结束时,基因B型HBV感染的患者完全应答率和HBeAg阴转率分别为43.8%(28/64)和68.2%(15/22),显著高于C型患者的完全应答率[22.2%(10/45)]和HBeAg阴转率[28.6%(4/14)]。结论:CHB患者HBV的基因型可影响干扰素α-2b的治疗效果,基因B型在治疗48周时应答情况优于基因C型。     

延安地区乙型肝炎病毒基因型与干扰素抗病毒治疗的效果

目的 了解延安地区不同HBV基因型临床特征及其干扰素抗病毒治疗的效果.方法 用PCR鉴定延安地区130例慢性乙型肝炎患者的HBV基因型,并对患者应用干扰素α-2b抗病毒治疗12个月,随访12个月,对治疗及随访资料进行回顾性分析.统计学处理采用x2检验.结果 延安地区HBV基因型以B、C基因型为最常见;B基因型HBeAg阳性率明显低于C基因型,且B+C基因型HBeAg阳性率也明显低于C基因型;B基因型与B+C基因型、B基因型与D基因型、C基因型与D基因型、D基因型与B+C基因型的HBeAg阳性率比较,差异均无统计学意义.B基因型对干扰素的完全应答率、持续应答率明显高于C基因型,而无应答率低于C基因型;B+C基因型的干扰素应答率低于B、C基因型.结论 延安地区B、B+C基因型HBeAg阳性率明显低于C基因型;B基因型对干扰素的完全应答率高于C基因型,B+C基因型的干扰素应答率低于B、C基因.     

HBV基因型与干扰素抗病毒疗效的关系

目的:探讨HBV不同基因型对α-干扰素抗病毒疗效的影响.方法:选取应用α-干扰素进行抗病毒治疗的慢性乙型肝炎患者作为研究对象,观察其抗病毒疗效.患者的HBV基因型采用PCR微板核酸杂交-ELISA方法检测;血清HBV DNA复制水平采用荧光定量PCR检测;HBV前C区和BCP(基础核心启动子)区基因位点变异采用HBV基因多态性芯片进行检测.结果:94例慢性乙型肝炎患者的HBV基因型以C型、B型为主,未发现A、E、F基因型.HBV DNA高复制水平明显与C基因型及混合基因型有关.B基因型对α-干扰素抗病毒治疗的应答明显优于C、D型,而混合基因型对α-干扰素的应答最不敏感.仅B基因型对α-干扰素治疗产生完全应答.部分应答及无应答时HBeAg的转阴与HBV前C区nt 1 896位点变异、以及BCP区nt 1 762、nt 1 764双位点变异有关.C基因型HBV前C区及BCP区基因变异发生率明显高于B型.结论:HBV基因型与HBV DNA复制水平、HBV基因变异以及α-干扰素抗病毒疗效均有一定的相关性,提示HBV基因分型有重要的临床意义.     

拉米夫定、α-2b干扰素治疗HBeAg(+)慢性乙型肝炎疗效与基因型相关性研究

目的 探索乙型肝炎病毒(HBV)基因型与拉米夫定、α-2b干扰素序贯治疗及单独予拉米夫定、α-2b干扰素治疗HBeAg阳性慢性乙型肝炎患者的疗效的相关性.方法 HBeAg阳性慢乙肝患者,来自北京等四城市.分别拉米夫定、干扰素序贯治疗48周、拉米夫定48周或干扰素24周.停药后随访24周.评价HBV基因型与抗病毒治疗应答的关系.PCR-RFLP方法检测HBV基因型、基因亚型.结果 225例患者中C基因型184例,其中C2亚型165例;B基因型41例,均为Ba亚型.治疗结束、随访结束时,各治疗组B型与C型间病毒学应答、血清学应答及完全应答率差异均无显著性.结论 该四城市HBeAg阳性慢乙肝患者HBV基因型以B型和C型为主,亚型以Ba和C2亚型为主.治疗结束、随访结束时,各治疗组B型与C型间疗效无差异.     

乙型肝炎病毒基因型与干扰素-α2b疗效的关系

目的研究乙型肝炎病毒基因型与干扰素-α2b治疗疗效的关系。方法采用DNA测序法对222例慢性乙型肝炎患者进行HBV基因分型。其中106例接受干扰素-α2b治疗6个月，观察治疗后应答率与基因型的关系。结果在106例接受干扰素-α2b治疗的患者，C基因型患者肝组织学改变明显重于B基因型。在6个月治疗结束时，B型感染者HBVDNA阴转、HBeAg血清转换和ALT复常率分别为41．9％，38．7％和58．1％，均显著高于C型患者（P〈0．05）。结论HBV基因型与肝损害程度及对干扰素-α2b的应答率有一定的关系。     

乙型肝炎病毒基因型检测及其临床应用

目的:探讨HBV基因型的检测及其在临床上的应用.方法:用微板核酸分子杂交-ELISA方法检测468例HBV DNA阳性的慢性乙型肝炎患者血清HBV基因型.分析HBV基因型与病毒复制、基本C基因启动子(BCP)变异、肝病病情轻重、干扰素疗效的关系.结果:深圳地区HBV基因型以B和C基因型为主,分别占25.0%和64.9%;C基因型的HBeAg阳性率(68.8%)高于B基因型的HBeAg阳性率(35.0%)(P＜0.01);C基因型的血清HBV DNA水平也明显高于B基因型(1g 6.74 copies/ml vs. 1g 5.44 copies/ml, P＜0.01);轻中度慢性肝炎以B基因型为主,而重度慢性肝炎以C基因型为主;B基因型对干扰素的有效应答率为47.2%,C基因型的有效应答率为28.9%,两组比较差异有显著性意义(P＜0.05).结论:HBV基因分型有助于临床判断病情、估计预后及抗病毒治疗疗效预测.     

慢性 HBV 感染者 HBV 基因型检测与抗病毒治疗的相关性

目的研究乙型肝炎病毒（HBV）基因型与抗病毒治疗前后患者血清HBVDNA载量、肝功能和HBeAg的相关性及其临床意义。方法采用巢式聚合酶链反应（PCR）杂交法对67例慢性乙型肝炎患者HBV进行基因分型,分别用快速自动验证法、荧光定量PCR法和ELISA法检测患者治疗前,治疗6、12个月后的血清丙氨酸氨基转移酶（ALT）、HBVDNA载量和HBV血清标志物。结果89例慢性乙型肝炎患者HBV基因型为B型48例,占66．7％,C型14例,占27．6％,B、C混合型3例,占3．4％,未分型2例,占2．3％;抗病毒治疗前,B基因型患者的ALT[（141．3±4．6）U/L]低于C基因型患者[（222．5±6．3）U/L],差异有统计学意义（P＜0．05）;B、C基因型患者HBVDNA载量分别为（6．3±1．0）和（6．6±1．1）log10拷贝/mL,差异无统计学意义;抗病毒治疗后,B、C基因型患者ALT和HBVDNA载量均比治疗前降低,且B基因型患者HBVDNA载量显著低于C基因型患者（P＜0．05）;B基因型患者的HBeAg阴转率（74．9％）和HBVDNA阴转率（41．7％）显著高于C基因型,分别为21．4％和28．6％（P＜0．05）。结论江苏地区HBV基因型以B型占显著优势,其次是C型,B基因型的临床表现轻于C基因型,对抗病毒治疗的应答更好,且较C基因型有更高的HBeAg阴转率。     

慢性乙型肝炎病毒基因型与干扰素治疗应答的关系

观察慢性乙型肝炎病毒基因型与α -干扰素治疗慢性乙型肝炎患者疗效的关系。利用限制性片段长度多态性分析技术 ,由限制性内切酶AvaⅡ和DpnⅡ作用于前S区扩增片段建立的简便的HBV基因型分型方法 ,对 6 0例经干扰素治疗的慢性乙型肝炎患者的血清HBV进行基因型测定 ,显示B基因型 31例 (5 1 7% ) ,C基因型 2 6(43 3% ) ,D基因型 3例 (5 0 % )。B型、C型与干扰素应答无明显差异 (P >0 0 5 ) ,3例D型均有效。由于我国大部分地区HBV基因型以B型和C型为主 ,HBV基因型可能不是预测干扰素疗效的重要因素。D型对干扰素应答率高 ,有待进一步研究。     

乙型肝炎病毒基因型对干扰素α2b应答的影响

在HBV基因型特异引物下聚合酶链反应(PCR)扩增并检测1020例慢性乙型肝炎患者血清HBVDNA。其中136例接受干扰素α2b治疗,疗程6个月;观察患者乙型肝炎病毒血清标志物、HBVDNA、丙氨酸转氨酶(ALT)。1020例乙型肝炎患者中966例有基因分型结果;136例接受干扰素α2b治疗综合疗效(HBeAg阴转、HB-VDNA阴转、ALT复常)B型患者为40.9%(18/44),优于C型25.8%(16/62)及B/C混合型16.7%(5/30)(P>0.05)。乙型肝炎病毒不同基因型可以对干扰素α2b应答产生影响。     

e抗原阳性慢性乙型肝炎患者感染病毒的基因型与抗病毒治疗疗效的关系

目的 探讨HBV基因型与抗病毒治疗疗效的关系。方法 应用PCR-微板核酸分子杂交ELISA法检测90例HBeAg阳性CHB患者的HBV基因型,对其中41例患者给予拉米夫定（100 mg／d）抗病毒治疗48周,49例患者给子干扰素α（3 MU／次,隔日1次）抗病毒治疗48周,治疗前、治疗过程中和治疗结束时分别检测血清生化指标（ALT）、病毒学血清标志物（HBeAg和抗-HBe）和HBV DNA水平。结果 90例CHB患者中HBV B基因型者16例,C基因型者74例。41例患者应用拉米夫定治疗,感染B和C基因型患者48周时对拉米夫定治疗应答率分别为33.3％和20%,差异无统计学意义;49例患者应用干扰素α治疗,48周时感染基因B型患者的ALT复常率、HBeAg消失率和HBV DNA阴转率均高于感染基因C型患者（分别为60.0％和20．5％,50．0％和17．9％, 50．0％和17．9％）,两组比较差异有统计学意义,但HBeAg血清转换率差异无统计学意义。结论 基因B和C型对拉米夫定抗病毒治疗的疗效无影响,基因B型对干扰素α治疗的疗效优于C型。     

乙型肝炎病毒基因型和早期病毒学应答对干扰素-α2b治疗慢性乙型肝炎疗效的预测价值

目的观察乙型肝炎病毒基因型以及早期HBV DNA应答对干扰素-α2b疗效的影响。方法136例慢性乙型肝炎患者接受干扰素-α2b治疗6个月,观察治疗结束时患者乙型肝炎病毒血清标志物、HBV DNA和ALT的变化。结果在完成治疗的129例患者中,C型感染者57例,B型感染者42例,B/C感染者30例。在治疗结束时,B型患者的综合应答率为42%,优于C型28%及B/C混合型16%。多变量Logistic回归分析显示,治疗3月时HBV DNA呈现应答者,治疗结束时应答率高（HBV DNA快速应答的偏回归系数=0.801,P=0.001,优势比=4.5,优势比的95%可信区间为3.01～5.28）。结论快速病毒学应答和感染病毒的基因型可以预测干扰素-α2b治疗慢性乙型肝炎的疗效。     

乙型肝炎病毒基因型与拉米夫定疗效关系的研究

探讨乙型肝炎病毒(HBV)基因型与拉米夫定治疗慢性乙型肝炎(CHB)疗效的关系。采用PCR、核酸杂交和酶联显色技术对CHB进行HBV基因分型,观察123例(B型93例和C型30例)CHB患者拉米夫定治疗1年后肝功能、病毒学指标和YMDD变异的变化。ALT复常率为92.47%,HBeAg阴转率为27.96%,HBVDNA阴转率为82.80%,有效应答率为89.25%,与C基因型相比差异有显著性(P<0.05或P<0.005)。B型YMDD变异的发生率为9.68%,显著低于C型的26.67%(P<0.05)。B型对拉米夫定的抗病毒疗效高于C型,YMDD变异的发生率则低于C型。HBV基因型是影响拉米夫定疗效和变异的重要因素之一。     

Effects of antiviral agents and HBV genotypes on intrahepatic covalently closed circular DNA in HBeAg-positive chronic hepatitis B patients

AIM： To evaluate the effects of antiviral agents and HBV genotypes on intrahepatic covalently closed circular DNA （ccc DNA） in HBeAg-positive chronic hepatitis B patients.
METHODS： Seventy-one patients received lamivudine （n = 35）, or sequential therapy with lamivudine- interferon alpha 2b （IFN-α 2b, n = 24） for 48 wk, or IFN-α 2b （n = 12） for 24 wk. All subjects were followed up for 24 wk. Intrahepatic ccc DNA was measured quantitatively by PCR. HBV genotypes were analyzed by PCR-RFLP.
RESULTS： Sequential lamivudine- INF-α therapy, lamivudine and INF-α monotherapy reduced ccc DNA of 1.7 log, 1.4 log and 0.8 log, respectively （P 〈 0.05）. Seventeen out of the 71 patieots developed HBeAg seroconversion, the reduction of ccc DNA in the HBeAg seroconversion patients was more significant than that in the HBeAg positive patients （3.0 log vs 1.6 log, P = 0.0407）. Twenty-four weeks after antiviral therapy withdrawal, 16 patients had a sustained virological response, the baseline intrahepatic ccc DNA in the patients with a sustained virological response was significantly lower than that in the patients with virological rebound （4.6 log vs 5.4 log, P = 0.0472）. HBV genotype C accounted for 85.9% （n = 61）, and genotype B for 14.1% （n = 10）, respectively, in the 71 patients. There was no significant difference in the change of ccc DNA level between HBV genotypes C and B （2.1 log vs 1.9 log）.
CONCLUSION： Forty-eight week sequential lamivudine- INF-α therapy and lamivudine monotherapy reduce ccc DNA more significantly than 24-wk INF-α monotherapy. Low baseline intrahepatic ccc DNA level may predict the long-term efficacy of antiviral treatment. HBV genotypes C and B have no obvious influence on ccc DNA load.     

Hepatitis B genotypes and the response to interferon therapy

BACKGROUND/AIMS: Possible pathogenic differences among hepatitis B virus (HBV) genotypes have been observed; however, the response to interferon therapy among HBV genotypes remains unknown. We therefore analyzed the efficacy of interferon alfa in the treatment of chronic hepatitis B patients with different HBV genotypes. METHODS: Fifty-eight genotype B or C infected chronic hepatitis B patients who had been treated with interferon alfa-2b were retrospectively studied. The response to interferon was defined as normalization of serum aminotransferase level, loss of hepatitis B e antigen and HBV DNA 48 weeks post-treatment. RESULTS: Baseline data of both groups of patients were comparable; however, genotype C patients had a higher serum aminotransferase level and a higher frequency of core promoter mutation. The response rate was 41% and 15% in genotype B and C patients, respectively (p=0.045). In those with higher serum aminotransferase levels, the response rate was 50% and 17%, respectively (p=0.025). Additionally, younger age and genotype B infection may predict a better response to interferon alfa. CONCLUSIONS: HBV genotype C, compared to genotype B, is associated with a higher frequency of core promoter mutation, and a lower response rate to interferon alfa therapy.     

HBV genotype B is associated with better response to interferon therapy in HBeAg(+) chronic hepatitis than genotype C

Hepatitis B virus (HBV) genotype and precore/core promoter mutations have been implicated in spontaneous and interferon alfa (IFN-alpha)-related hepatitis B e antigen (HBeAg) seroconversion. We performed a retrospective analysis of a previously reported randomized controlled trial to determine the effects of HBV genotype and precore/core promoter mutations on IFN-alpha response in patients with HBeAg-positive chronic hepatitis. Clinical data and stored sera from 109 (95%) patients in the original trial were analyzed. Seventy-three patients received IFN-alpha and 34 received no treatment (controls). Almost all patients had HBV genotypes B (38%) and C (60%). Antiviral response was achieved in 39% and 17% of IFN-alpha-treated patients (P =.03) and in 10% and 8% of untreated controls (P =.88) with HBV genotype B and C, respectively. Multivariate analysis identified HBV genotype B, elevated pretreatment alanine aminotransferase (ALT) levels, and low pretreatment HBV-DNA levels but not IFN-alpha treatment as independent factors associated with antiviral response. Among the 66 patients with elevated pretreatment ALT level, antiviral response was achieved in 57% and 21% of IFN-alpha-treated patients (P =.019), and in 25% and 8% of untreated controls (P =.45) with HBV genotype B and C, respectively. Multivariate analysis showed that genotype B and low pretreatment HBV-DNA levels were independent predictors of antiviral response. In conclusion, our data showed that HBV genotype B was associated with a higher rate of IFN-induced HBeAg clearance compared with genotype C. Stratification for HBV genotypes should be considered in future clinical trials of antiviral therapy of chronic hepatitis B.     

抗病毒药物对肝组织乙型肝炎病毒共价闭合环状DNA的影响

目的 探讨抗病毒药物对肝组织HBV共价闭合环状DNA(cccDNA)的影响.方法 71例HBeAg阳性的慢性乙型肝炎患者分别接受48周的拉米夫定-干扰素序贯治疗、单用拉米夫定治疗和24周的干扰素治疗,随访24周.检测治疗前、后肝组织HBV DNA和cccDNA水平;检测治疗前、后及停药24周时的血清HBV DNA和ALT水平.比较C、B基因型HBV感染患者肝组织HBV DNA和cccDNA水平.结果 治疗结束时,序贯治疗、拉米夫定治疗和干扰素治疗组患者肝组织HBV DNA分别为(4.7±1.1)log10、(4.6±1.5)log10和(5.6±1.5)log10,均低于治疗前水平(P＜0.05);cccDNA分别为(3.4±1.3)log10、(3.8±1.1)log10和(5.0±1.5)log10,均低于治疗前水平(P＜0.05).17例患者出现了HBeAg血清学转换,其肝组织cccDNA下降幅度明显大于HBeAg阳性患者(3.0 log10比1.6 log10,P＜0.05).停药24周,18例患者获得持续病毒学应答,其cccDNA基线值明显低于停药后出现病毒反跳患者(P＜0.05).肝组织cccDNA的变化与肝组织HBV DNA的改变正相关(P＜0.05);治疗结束时,肝组织cccDNA水平与血清HBeAg滴度正相关(P＜0.01).C基因型与B基因型HBV感染患者治疗前、后肝组织HBV DNA和cccDNA的变化无统计学意义(P＞0.05).结论 48周的拉米夫定-干扰素序贯治疗和拉米夫定治疗对肝组织cccDNA抑制作用强于24周的干扰素治疗.肝组织cccDNA低水平患者易获得较好的抗病毒疗效.HBV基因型对肝组织cccDNA含量无明显影响.     

Effect of Hepatitis B Virus Genotypes on the Efficacy of Adefovir Dipivoxil Antiviral Therapy

Background:

Hepatitis B is a common infectious disease in China. Many studies have shown that the genotype of hepatitis B virus (HBV) is probably associated with the efficacy of some antiviral drugs such as interferon α (IFN-α) and Lamivudine (LAM). However, the association between HBV genotype and adefovir dipivoxil (ADV) is controversial. ADV is the most popular antiviral drug in China due to its low price, good antiviral efficacy, few side effects, and convenient of administration.

Objectives:

This study focused on the effect of HBV genotypes on antiviral efficacy of ADV in patients with chronic hepatitis B infection (CHB).

Patients and Methods:

A total of 526 HBeAg-positive patients with CHB were randomly allocated into two groups. One group took ADV and another group took placebo. Nested Polymerase Chain Reaction (PCR) with multiple pairs of genotype-specific primers (nPCR-MPP) was used to analyze genotypes of HBV in these patients. Antiviral efficacy after treatment for three, six, 12 months was compared among the patients with different HBV genotypes.

Results:

Genotype B (73.6%) and genotype C (26.4%) were detected in these patients. After treatment for 12 months, the rate of HBV DNA seroclearance, ALT normalization, and HBeAg seroconversion were significantly higher in ADV group than in placebo group (P < 0.05). However, there were no significant differences in these three rates between patients infected with genotype B and C (P > 0.05).

Conclusions:

HBV genotypes B and C have no significant difference in virologic, biochemical, and immunologic response to ADV.