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【文摘发布】小剂量干扰素治疗基因型为B型的年

Title:Genotype B and Younger Patient Age Associated with Better Response to Low-Dose Therapy: A Trial with Pegylated/Nonpegylated Interferon--2b for Hepatitis B e Antigen–Positive Patients with Chronic Hepatitis B in China

Author:Hong Zhao,1 Fuat Kurbanov,7 Mo-Bin Wan,3 You-Kuan Yin,4 Jun-Qi Niu,5 Jin-Lin Hou,6 Lai Wei,2 Gui-Qiang Wang,1 Yasuhito Tanaka,7 Masashi Mizokami,7 and Chong-Wen Si1

Resource:Clinical Infectious Diseases 2007;44:541-548 Impact Factor:6.510 学习交流下~~~
Title:Genotype B and Younger Patient Age Associated with Better Response to Low-Dose Therapy: A Trial with Pegylated/Nonpegylated Interferon--2b for Hepatitis B e Antigen–Positive Patients with Chronic Hepatitis B in China
B基因型和年青患者年龄与对低剂量治疗更好应答相关:在中国进行的一项临床研究,使用聚乙二醇修饰的(长效)/非聚乙二醇修饰的(普通)干扰素-2b治疗乙型肝炎e抗原阳性的慢性乙型肝炎患者。
Abstract:
Background. Cost and clinically significant adverse effects are the major limiting factors of interferon (IFN) use in therapy for chronic hepatitis B virus (HBV) infection. A clinical trial was conducted in China to study the efficiency and clinical relevance of low-dose regimen of IFN treatment for chronic HBV infection and to reveal factors predicting sustained combined response.
背景-治疗费用和显著临床不良反应是应用干扰素治疗慢性乙型肝炎病毒感染的两大主要限制。在中国进行的一项临床试验,研究了对慢性HBV感染低剂量干扰素治疗方案的效果和临床意义,并揭示了预测持续联合应答的因素。
Methods. During a randomized, open-label control study, hepatitis B e antigen (HBeAg)–positive patients with chronic HBV infection (n = 230) were assigned to receive pegylated IFN--2b (1.0 g/kg) (n = 115) or IFN--2b (3 MIU; n = 115) for a 24-week period. Sustained combined response was assessed 24 weeks after the completion of treatment.
Results. The greater rate of HBeAg loss in the pegylated IFN-group (23%) was the only statistically significant difference between the 2 treatment arms observed at the end of follow-up. The results of the multivariate statistical analysis revealed that HBV genotype B and patient age (25 years) were 2 independent factors associated with sustained combined response. A total of 40% of patients with HBV genotype B aged 25-years achieved sustained combined response. Only 4 (1.7%) of 230 patients discontinued therapy because of clinically significant adverse effects.
方法-在随机、非盲对照研究中,伴有慢性乙型肝炎感染的乙型肝炎e抗原(HBeAg)阳性患者(230例)分别接受长效IFN--2b (1.0 g/kg)(115例)或(短效)干扰素IFN--2b (3 百万国际单位; 115例)进行为期24周的治疗。在治疗完成后24周评定持续联合应答。
结果-在长效干扰素组取得较大的HBeAg转阴率(23%),是随访结束时两个治疗组中观察到的仅有的统计学显著性差异。多变量统计分析的结果显示乙型肝炎病毒B基因型和患者年龄(25岁)是持续联合应答的两个独立相关因素。达40%的年龄在25周岁的,带有B基因型乙型肝炎病毒的患者成功取得持续联合应答反应。230位患者中仅有4例由于显著的临床(干扰素)不良反应而中途退出试验。
Conclusions. The choice of low-dose IFN regimen might be a relevant clinical option to reduce the cost and adverse effects of therapy for younger patients with chronic HBV infection and genotype B infection in countries where it is prevalent.
结论-在B基因型慢性乙型肝炎病毒感染年青患者居多的国家中,为了降低治疗费用和治疗的不良反应,选择低剂量干扰素治疗方案或许是恰当的临床选择。
PS:
持久应答 (sustained response) 治疗结束后随访6 个月或12 个月以上,疗效维持不变,无复发。
维持应答 (maintained response) 在抗病毒治疗期间表现为HBV DNA 检测不到 (PCR 法) 或低于检测下限,或ALT 正常。
联合应答 (combined response) :阳性慢性乙型肝炎患者,治疗后ALT 恢复正常, HBV DNA 检测不出 (PCR 法) 和HBeAg 血清学转换; HBeAg 阴性慢性乙型肝炎患者,治疗后ALT 恢复正常, HBV DNA 检测不出 (PCR 法)。

文中提及的小剂量取得应答率23%,并没有先前国际上已有的研究[PegIFN α-2a (40 KD)]的32%来的高。

干扰素抗病毒疗效的预测因素:
有下列因素者常可取得较好的疗效:(1) 治疗前高ALT 水平;(2) HBV DNA< 2×108 拷贝/ml; (3) 女性; (4) 病程短;(5) 非母婴传播; 肝脏纤维化程度轻;(7) 对治疗的依从性好; 无HCV、HDV 或HIV 合并感染者。其中治疗前HBV DNA 、ALT 水平及患者的性别是预测疗效的主要因素

摘自《慢性乙肝防治指南》

长效干扰素:
聚乙二醇是一种惰性、易溶于水、可以做成任意大小的物质,普通干扰素经过它的“改造”后,分子就会变大,不能或很少由肾脏“漏”出,达到了延长在体内存在时间的目的。普通干扰素α-2b的半衰期只有4个小时,而经过聚乙二醇化的干扰素α-2b的半衰期达40个小时。SPRI最终确定12KD(一种衡量分子大小的指标)分子大小的聚乙二醇是最理想的聚乙二醇,它在延长半衰期的同时,对干扰素活性的影响最小,既保证了一周一次给药,又最大程度地保留其抗病毒活性。

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作者:admin@医学,生命科学    2011-02-18 17:12
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