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Hepatology:肝移植围手术期ALC可为移植后HCV早期复发预测指标

2013-12-30 xiaorong699 dxy

肝移植前后不同的淋巴细胞绝对数组对病人总体生存率的影响 研究要点 1.肝移植前后的淋巴细胞绝对计数是一个新的实用的指标,它可预测丙肝的复发情况和病人的生存周期。 2.淋巴细胞数与丙肝的复发及引起的纤维化具有明显的负相关。 3.免疫抑制剂的使用方案和围手术期的处理都应参考淋巴细胞的绝对计数。   淋巴细胞在人体对丙型肝炎(HCV)的自然免疫中起重要作


肝移植前后不同的淋巴细胞绝对数组对病人总体生存率的影响

研究要点

1.肝移植前后的淋巴细胞绝对计数是一个新的实用的指标,它可预测丙肝的复发情况和病人的生存周期。

2.淋巴细胞数与丙肝的复发及引起的纤维化具有明显的负相关。

3.免疫抑制剂的使用方案和围手术期的处理都应参考淋巴细胞的绝对计数。
 
淋巴细胞在人体对丙型肝炎(HCV)的自然免疫中起重要作用。但是淋巴细胞的绝对计数(ALC)是否会影响肝移植后丙肝的复发尚未清楚。来自美国底特律的亨利福特医院的研究人员对此进行了研究。研究结果认为,肝移植围手术期绝对淋巴细胞计数(ALC)可以作为肝移植后丙肝早期复发的预测指标。该研究成果将发表在2014年1月《肝病学》(Hepatology)杂志上。

该研究共纳入了2005-2011年期间的289位肝移植病人。研究人员检测了这些病人肝移植前后(移植前2周,移植后一个月)的淋巴细胞绝对计数和免疫抑制情况。结合捐赠者和接受者的因素,研究人员旨在确定肝移植后丙肝复发的危险因素。

研究人员根据病人移植前后的淋巴细胞绝对计数把病人分为<500/uL,500-1000/uL,>1000/uL三组。淋巴细胞数与丙肝的复发及引起的纤维化具有明显的负相关。多因素cox回归分析发现移植后1个月的淋巴细胞绝对计数对丙肝的复发是一个独立的预测因素(在<500/uL组中HR=2.47)。

当病人移植前后淋巴细胞绝对计数持续在一个低水平(移植前2周,移植后1个月都小于500/uL),病人在HCV复发后进展为纤维化(两年内F3-4分)的风险明显增高(HR=3.16)。而且移植前低淋巴细胞血症(<500/uL)可以作为病人总体生存率下降的独立的预测因素(HR=3.01)。

兔抗胸腺细胞球蛋白诱导剂(RATG)尽管会诱导产生低淋巴细胞血症,但是对丙肝的复发有明显的保护作用(HR=0.6)。但是亚群分析发现不管有没有使用RATG,移植后1个月时的低淋巴细胞血症都具有明显的负作用。RATG的保护作用与移植后的低淋巴细胞血症两者不相关。

研究结果表明,肝移植前后的淋巴细胞绝对计数是一个新的实用的指标。它可以预测丙肝的复发情况和病人的生存周期。免疫抑制剂的使用方案和围手术期的处理都应参考淋巴细胞的绝对计数。

研究背景

由HCV感染引起的肝硬化是美国肝脏移植最普遍的适应症。尽管科学家们为预防再感染和肝炎的复发做了很多的努力,但是目前还是没有一个可以有效控制肝移植后丙肝复发的办法。捐赠者的年龄,接受者的性别,HCV的病毒载量都被认为是可能的危险因素。除此以外,还有很多研究表明,对肝脏排斥的治疗与HCV的复发有关。尽管这些研究都建议为HCV引起肝移植病人提供一定的免疫抑制治疗。但是统一标准仍需进一步的研究。

肝移植后的体液免疫和细胞免疫对HCV的复发的影响未知。淋巴细胞特别是T细胞,在肝细胞清除HCV起重要作用。慢性肝炎和肝硬化病人有可能由于体质虚弱,营养不良,全血细胞伴随淋巴细胞减少而出现的免疫缺陷。肝移植后,病人面临着手术压力,围手术期的免疫抑制,营养不良的打击。这些环境因素使病人对HCV的免疫反应减弱,导致了HCV的更严重的复发。总之,一个病人的围手术期的免疫状态对肝移植后的HCV的结局至关重要。但是只有少数几篇文章有过类似的报道。

在临床上,ALC可以反映一个人的营养状况,还可以作为衡量免疫力的替代指标。ALC包括T细胞,B细胞,NK细胞。研究人员假设肝移植前后的淋巴细胞减少与较差的肝移植结局有关。该研究的目的在于调查肝移植病人在移植前后的ALC对HCV的复发是否相关。

研究发现,肝移植前后的淋巴细胞绝对计数是一个新的实用的指标。它可以预测丙肝的复发情况和病人的生存周期。淋巴细胞数与丙肝的复发及引起的纤维化具有明显的负相关。免疫抑制剂的使用方案和围手术期的处理都应参考淋巴细胞的绝对计数。兔抗胸腺细胞球蛋白诱导剂对丙肝的复发有明显的保护作用。


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    2014-01-01 ymljack
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    2014-01-01 gwc384

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