异基因造血干细胞移植后人类疱疹病毒6型活化与急性移植物抗宿主病的相关性研究

目的研究造血干细胞移植（HSCT）后人类疱疹病毒6型（HHV．6）活化与急性移植物抗宿主病（aGVHD）的相关性。方法移植前以及移植后每周1次连续采集72例患者的外周血样本，采用筑巢式聚合酶链反应扩增HHV-6基因序列，HindⅢ酶切对HHV-6基因分型。结果72例患者移植后45例（62．5％）检出HHV-6血症，中位时间为第14（7—63）天；40例（55．6％）患者发生Ⅰ～Ⅳ度aGVHD，中位时间第26（9～73）天。HHV．6血症发生的中位时间显著早于Ⅰ～Ⅳ度aGVHD发生时间（P=0．018）。Ⅰ～Ⅳ度aGVHD累积发生率在HHV-6阳性组为68．9％（45例中31例），显著高于HHV-6阴性组的33．3％（27例中9例）（P=0．003）。Ⅱ-Ⅳ度aGVHD累积发生率HHV-6阳性组为35．6％，显著高于HHV-6阴性组的14．8％（P=0．027）。移植后Ⅰ-Ⅳ度aGVHD的发生率在巨细胞病毒（CMV）和HHV-6共感染（CMV^＋／HHV-6^＋）组、CMV阳性HHV-6阴性（CMV^＋／HHV-6^-）组、CMV阴性HHV-6阳性（CMV^-／HHV-6^-）组和CMV与HHV-6均阴性（CMV^-／HHV-6^-）组分别为78，9％，55．6％，14．3％和22．2％，差异有统计学意义（P=0．0001）。Ⅱ～Ⅳ度aGVHD累积发生率在CMV^＋／HHV-6^＋、CMV^＋／HHV-6^-、CMV^-／HHV-6^＋和CMV^-／HHV-6^-组分别为42．1％．22．2％，0％和11．1％，差异有统计学意义（P=0．008）。结论HSCT后HHV-6感染以及HHV-6和CMV共感染与aGVHD发生率存在显著相关性。

Correlation between human herpesvirus 6 activation and acute graft-versus-host disease after allogeneic hematopoietic stem cell transplantation

OBJECTIVE: To study the potential relationship between HHV-6 activation and acute graft-versus-host disease (aGVHD) after allogeneic hematopoietic cell transplantation (HSCT). METHODS: Peripheral blood samples were collected before and weekly after HSCT from 72 consecutive recipients. HHV-6 DNAemia was monitored by nested polymerase chain reaction (PCR). The genotypes of HHV-6 were identified by Hind III restriction assay. RESULTS: Of the 72 patients, HHV-6 DNAemia were detected in 45 (62.5%) on a median of day 14 (range, 7 - 63 days) after HSCT. Grade I - IV aGHVD occurred in 40 (55.6%) on a median of day 26 (range, 9 -73 days). The median onset time of HHV-6 DNAemia was significantly earlier than that of aGHVD (P = 0.018). Compared with that in HHV-6 DNAemia negative [HHV-6(-)] patients, the cumulative incidence of grade I - IV aGHVD was higher (68.9% vs. 33.3% , P = 0.003) in HHV-6 (+) patients. Cumulative incidence of grade II - IV aGVHD in HHV-6 (+) cohort was also higher than that in HHV-6 (-) cohort (35.6% vs 14.8% , P = 0.027). Cumulative incidence of grade I - IV aGVHD was higher in patients with both HHV-6 and CMV positive (CMV+/HHV-6+) than in those with either CMV (CMV+/HHV-6-) or HHV-6 positive (CMV+/HHV-6+) and neither of them positive (CMV-/HHV-6-) [78.9% (30/38), 55. 6% (5/9) , 14. 3% (1/7) and 22. 2% (4/18), respectively, P = 0. 0001]. Cumulative incidence of grade II - IV aGVHD in CMV+/HHV-6+ group was also higher than that in CMV+/HHV-6-, CMV-/HHV-6+ and CMV-/HHV-6- groups [42.1% (16/38), 22.2% (2/9), 0% (0/7) and 11.1% (2/18), P = 0. 008]. CONCLUSIONS: Patients with HHV-6 activation or HHV-6/CMV co-infection maybe involved in the occurrence of aGVHD after HSCT.