两种实时荧光定量聚合酶链反应检测血清HCV RNA的比较

目的 比较全自动病毒载量检测系统(COBAS TaqMan)和国产荧光定量PCR试剂盒对血清HCV RNA载量的检测结果,探讨两种检测方法在临床诊断和治疗中的应用价值.方法 收集26例慢性丙型肝炎患者抗病毒治疗前和治疗过程中2、4、8、12、24、36和48周的系列血标本,共168份,采用COBAS TaqMan 48全自动分析系统和广州某国产TaqMan实时PCR试剂盒分别检测系列血清中的HCV RNA载量.统计学处理采用x2检验和t检验.结果 当血清HCV RNA≥1×104IU/mL时(0周),COBAS检测和国产试剂盒均能很好测定HCV载量,而且国产试剂盒检测值为1.35×107IU/mL高于COBAS检测值2.21×106IU/mL,差异有统计学意义(t=2.05,P<0.05);血清HCV RNA<1×104IU/mL时(2～48周),COBAS检测出的HCV阳性率为21.4%(30/140),远高于国产试剂盒的1.4%(2/140),差异有统计学意义(t=3.66,P<0.01);治疗4周时,COBAS检测26例患者中14例血清HCV为阳性,12例病毒载量低于检测下限,获得快速病毒学应答(RVR);国产试剂盒检测结果为3例血清HCV为阳性,23例获得RVR.COBAS与国产试剂盒梧比,转阴率差异有统计学意义(x2=10.575,P<0.01).治疗12周时,COBAS检测完全早期病毒学应答(cEVR)率为95.7%(22/23),国产试剂盒检测的cEVR为100%(17/17),差异无统计学意义(x2=0.726,P>0.05).结论 国产荧光定量PCR试剂盒可用于HCV疑似患者的筛查和高HCVRNA载量者的确诊,对于低HCV RNA载量的疑似患者和抗病毒治疗过程中HCV载量的检测,COBAS则更为敏感.

Abstract：

Objective To compare the plasma hepatitis C virus(HCV)RNA levels detected by the fully automated viral load detection system(COBAS TaqMan)and the national real-time quantitative polymerase chain reaction(PCR)kit,and to investigate the clinical application value of these two methods in clinical practice.Methods A total of 168 serial plasma samples collected from 26 patients with chronic hepatitis C(CHC)before and at week 2,4,12,24,36 and 48 of antiviral treatment were detected by both COBAS Taqman 48 analyzing system and the national real-time quantitative PCR kit.The results of two methods were compared by chi square test and t test.Resnlts Both COBAS and national kit showed great positive detecting results when HCV RNA≥1×104IU/mL(at week O),and the virus load value detected by national kit was significantly higher than that detected by COBAS(t=2.05,P<0.05).However,when HCV RNA<1×104(at week 2-48),the positive rate of HCV detected by COBAS was significantly higher than that detected by national kit (t=3.66,P<0.01).At week 4 of treatment,the rapid virological response(RVR)rate was 46.2 % (12/26)detected by COBAS,while that was 88.5%(23/26)detected by national kit,and the difference was significant(x2=10.575,P<0.01).At week 12 of treatment,the complete early virological response(cEVR)was 95.7%(22/23)detected by COBAS,while that was 100%(17/17)detected by national kit,and the difference was not significant(x2=0.726,P>0.05).Conclusions The national TaqMan real-time quantitative PCR kits could be used to screen the suspected cases of HCV infecrion and to diagnose CHC cases with high HCV virus load.COBAS detection is more sensitive in cases with low HCV virus load and in on-treatment monitor during anti-HCV therapy.

Comparison of two real-time quantitative polymerase chain reaction for detecting HCV RNA virus load in plasma

Objective To compare the plasma hepatitis C virus(HCV)RNA levels detected by the fully automated viral load detection system(COBAS TaqMan)and the national real-time quantitative polymerase chain reaction(PCR)kit,and to investigate the clinical application value of these two methods in clinical practice.Methods A total of 168 serial plasma samples collected from 26 patients with chronic hepatitis C(CHC)before and at week 2,4,12,24,36 and 48 of antiviral treatment were detected by both COBAS Taqman 48 analyzing system and the national real-time quantitative PCR kit.The results of two methods were compared by chi square test and t test.Resnlts Both COBAS and national kit showed great positive detecting results when HCV RNA≥1×104IU/mL(at week O),and the virus load value detected by national kit was significantly higher than that detected by COBAS(t=2.05,P<0.05).However,when HCV RNA<1×104(at week 2-48),the positive rate of HCV detected by COBAS was significantly higher than that detected by national kit (t=3.66,P<0.01).At week 4 of treatment,the rapid virological response(RVR)rate was 46.2 % (12/26)detected by COBAS,while that was 88.5%(23/26)detected by national kit,and the difference was significant(x2=10.575,P<0.01).At week 12 of treatment,the complete early virological response(cEVR)was 95.7%(22/23)detected by COBAS,while that was 100%(17/17)detected by national kit,and the difference was not significant(x2=0.726,P>0.05).Conclusions The national TaqMan real-time quantitative PCR kits could be used to screen the suspected cases of HCV infecrion and to diagnose CHC cases with high HCV virus load.COBAS detection is more sensitive in cases with low HCV virus load and in on-treatment monitor during anti-HCV therapy.