Spontaneous resolution of transfusion-associated graft-versus-host disease

BACKGROUND: Transfusion-associated graft-versus-host disease (TA-GVHD) is a serious complication of blood transfusion that is characterized by high fever, a scaly maculopapular erythematous rash, diarrhea, hepatocellular damage with marked elevation of liver function test values, and pancytopenia. It can occur in immunocompetent as well as immunocompromised recipients. The existence of atypical TA-GVHD that resolves spontaneously and does not exhibit all of the manifestations has been suggested, but there has been to date no documented diagnosis of GVHD supported by evidence of engraftment. CASE REPORT: A female patient presented and was diagnosed with acute myelogenous leukemia (AML:M4), and, after unsuccessful combination chemotherapy, she received a transfusion and developed manifestation of TA-GVHD as well as evidence of chimerism. TA-GVHD was proved by demonstrating Y chromosome-specific genes in the skin by polymerase chain reaction. The manifestations of clinical GVHD abated within 4 months. CONCLUSION: Polymerase chain reaction analysis of Y chromosomes in specimens from female patients is useful in the diagnosis of suspected cases of spontaneously resolving TA-GVHD.     

非清髓造血干细胞移植后致敏供者淋巴细胞输注对嵌合状态及GVHD影响的实验研究

本研究目的是探讨经受者皮肤致敏后的异基因供者淋巴细胞输注(DLI)是否能在促进形成完全供者嵌合(CC)的同时减轻移植物抗宿主病(GVHD)。以C57BL/6小鼠(H-2b,B6)为受者,于第0天接受60Coγ线全身照射(TBI),总剂量为5.5Gy,照射当天移植经粒细胞集落刺激因子(G-CSF)动员后的BALB/c小鼠(H-2d,BA)外周血干细胞(2×107个),移植后第2天腹腔注射环磷酰胺200mg/kg,并分别于移植后第28天输注致敏/未致敏的供者淋巴细胞2×106。结果显示,致敏后DLI的受鼠(黑色)无1例出现GVHD,60天时转变为完全供者嵌合,表型明显呈现为供鼠(白色)特征,CD4+/CD8+T淋巴细胞比值在DLI后早期下降,半月后有所升高,但仍低于正常水平;未致敏的DLI受鼠出现不同程度的GVHD,嵌合率稍有上升,仍表现为混合嵌合体(MC),CD4+/CD8+比值在DLI后早期升高,后期降至正常水平。结论:经受者皮肤致敏后的DLI在诱导CC的同时降低GVHD发病率,CD4+/CD8+比值与GVHD发病率间具有良好的相关性。     

Early diagnosis and successful treatment of a patient with transfusion-associated GVHD with autologous peripheral blood progenitor cell transplantation

BACKGROUND: Transfusion-associated GVHD (TA-GVHD) is an uncommon complication of blood transfusion. Diagnosis of TA-GVHD is difficult, and it is usually rapidly fatal. There are few documented sur- vivors of TA-GVHD. CASE REPORT: A 61-year-old woman with chronic lymphocytic leukemia (CLL) was treated with fludarabine followed by combination chemotherapy and high-dose radioimmunotherapy and peripheral blood progenitor cell (PBPC) rescue. She was transfused with nonirradiated blood components at an outside hospital and presented 10 days later with rash, elevated liver enzymes, and progressive pancytopenia. Skin biopsy was consistent with GVHD, and HLA typing of lymphocytes from the patient demonstrated mixed chimerism. The patient was treated with solumedrol and cyclosporin A, followed by high-dose cyclophosphamide and antithymocyte globulin and autologous PBPC infusion. She had rapid engraftment, resolution of skin rash, and normalization of liver function abnormalities. She is in good health with normal blood counts and no evidence of CLL 34 months after transplantation. CONCLUSION: TA-GVHD occurs in the setting of an immunocompromised recipient receiving nonirradiated blood components. A typical presentation includes skin rash, liver function abnormalities, and pancytopenia. Demonstration of mixed chimerism by HLA typing facilitated diagnosis in this patient. High-dose immunosuppression, facilitated by the availability of autologous PBPCs, resulted in a successful outcome.     

非亲缘供者外周血造血干细胞移植治疗恶性血液病

为了探讨非亲缘供者外周血造血干细胞移植(UD-HSCT)治疗恶性血液病的可行治疗方案和疗效,应用高分辨HLA配型(HLA-A、-B、-DR)完全相合或1个位点不合的非亲缘供者外周血造血干细胞移植治疗恶性血液病10例,预处理方案采用马利兰、环磷酰胺、阿糖胞苷、甲基环己亚硝脲和抗胸腺细胞球蛋白,以霉酚酸酯、环孢素A加短疗程的甲氨喋呤、舒莱预防移植物抗宿主病(GVHD)。结果显示,中性粒细胞回升>0.5×109/L的中位时间为13天,血小板回升>20×109/L的中位时间为17.5天;28天STR-PCR检测显示,10例均为完全供者型;急性GVHD3例(Ⅰ度1例自行缓解,Ⅲ度1例治愈,Ⅵ度1例死亡)。结论:在非亲缘供者外周血造血干细胞移植治疗恶性血液病过程中采用上述预处理方案和GVHD预防措施是可行而且有效的。     

非清髓异基因外周血造血干细胞移植治疗血液病的临床观察

目的　探讨非清髓异基因外周血造血干细胞移植 (NASCT)在治疗血液病中的意义。方法　采用NASCT治疗 33例HLA相合的血液病患者。男 2 0例 ,女 13例 ,中位年龄 36岁 (18～ 5 9岁 )。33例中急性白血病第 1次完全缓解期 (CR1 ) 11例 ,CR2～ 34例 ,难治复发性急性白血病未缓解期 3例 ,重型再生障碍性贫血 (SAA) 4例 ,慢性粒细胞白血病慢性期 7例 ,骨髓增生异常综合征 (MDS) 2例 ,慢性淋巴细胞白血病和骨髓纤维化各 1例。非清髓预处理方案 :白血病患者采用环磷酰胺 (CTX)、阿糖胞苷及CD3单克隆抗体 ,6例患者在此基础上加用氟达拉宾。SAA和MDS患者采用CTX和抗胸腺细胞球蛋白。结果　 33例均顺利渡过造血抑制期。平均移植后第 10 .5天 (移植后第 8～ 2 1天 )中性粒细胞计数 >0 .5× 10 9 L ,第 15天 (移植后第 10～ 30天 )血小板计数 >30× 10 9 L。 33例中供者细胞完全植入2 4例 (其中 13例于移植后 1～ 6个月由供受者嵌合性植入转为完全植入 ) ,稳定混合嵌合体 4例 ,移植排斥 5例。 33例中发生急性和慢性移植物抗宿主病各 7例 (2 1.2 % )。随诊 2～ 36个月 2 5例 (75 8% )仍存活。结论　NASCT简便安全 ,并发症少 ,疗效较好 ,为治愈血液病提供了新手段。     

异基因造血干细胞移植后细胞嵌合状态动态监测的临床意义

目的 研究异基因造血干细胞移植(allo-HSCT)后各系细胞嵌合状态与移植物植入、急性移植物抗宿主病(aGVHD)、移植物被排斥和疾病复发的关系.方法 对65例患者进行allo-HSCT,在移植后定期采集所有患者的外周血和骨髓.用流式细胞术分选了65例患者的CD3+T淋巴细胞,52例分选了CD3-CD56+CD16+NK细胞,32例分选了CD15+粒细胞,20例分选了CD19+B淋巴细胞.进行PCR扩增短串联重复序列检测各系细胞嵌合状态.结果 移植后NK细胞早期植入比例(55.5%)最高,T细胞最晚(+21 d)达到完全供者嵌合状态.+7 d T淋巴细胞供者嵌合比例(DC)≥70%和+14 d T淋巴细胞DC≥95%属aGVHD发生的高危患者.除急性淋巴细胞白血病外,出现移植物被排斥的分子生物学征象者和疾病复发者,都以T淋巴细胞供者嵌合状态下降为主.在过继免疫治疗中,动态检测嵌合状态可以判断疗效和指导进一步的治疗.结论 allo-HSCT后T淋巴细胞嵌合状态动态检测可以早期预测发生aGVHD的高危患者、判断移植物植入、发现移植物被排斥和疾病复发并指导免疫调节治疗的时机和疗效.     

STR-PCR分析嵌合体在同种异基因造血干细胞移植中的应用

利用荧光标记的多重PCR扩增短串联重复序列（STR-PCR）结合毛细管电泳检测供者细胞嵌合率（DC）,以探讨该方法的连续检测对异基因造血干细胞移植（allo-HSCT）后转归的预警作用,采集27例清髓性外周血干细胞移植患者移植前、移植后不同时段的外周血或骨髓,DNA样本用Profiler Plus和Cofiler Plus商品化试剂盒扩增后,用ABI310遗传分析仪进行毛细管电泳,确定基因位点及峰面积,根据基因型的差异选择嵌合率计算公式。结果表明：两种试剂盒测得的DC嵌合率一致;在27对中能区别出供受差别的STR位点,Profiler Plus为6.3（4-9）个,Cofiler Plus为4.9（2-6）个。26例患者均在移植后28天出现供者细胞,1例患者未出现供者细胞。14例患者DC100%,均获得持久植入,至今仍无白血病生存;另有9例患者出现不稳定混合嵌合（MC）状态（DC为0%-90.2%）,其中5例为血液学复发。27例病人中有6例死亡。上述5例复发患者均在出现临床症状前发生DC量下降;供者细胞完全嵌合组移植物抗宿主病（GVHD）的发生率高于MC组。结论：动态检测DC可用于移植动力学研究,对移植物早期植入或被排斥、疾病复发以及GVHD的发生均有预警作用,对早期实施临床干预治疗有重要的指导意义。     

Transfusion‐associated graft‐versus‐host disease in a liver transplant recipient: an unusual presentation and review of the literature

BACKGROUND: Transfusion‐associated graft‐versus‐host disease (TA‐GVHD) is a rare, nearly universally fatal complication from transfusion of nonirradiated cellular blood components, occurring when a recipient's immune system is unable to recognize and destroy transfused T lymphocytes. Irradiation of cellular components eliminates this risk. We present an unusual case of a liver transplant recipient developing TA‐GVHD 13 weeks after transfusion of a random unit of nonirradiated red blood cells (RBCs) that happened to be from a donor homozygous for an HLA haplotype shared by the patient. STUDY DESIGN AND METHODS: This study was a single case review of a liver transplant recipient who developed skin GVHD and marrow aplasia. Clinical course and the chimerism studies involving the patient, the liver donor, and the blood donor are detailed. RESULTS: The patient presented 3 months posttransplant with GVHD of his skin and marrow aplasia. In addition to standard antigraft immunosuppression, this patient had started the interleukin‐1 receptor antagonist anakinra on Posttransplant Day 13 for an acute gout flare. Chimerism studies on the patient's peripheral blood identified a population of CD3 cells that did not originate with either the patient or his liver donor. HLA studies and microsatellite profiling of the unknown CD3 population identified the source of the patient's TA‐GVHD, a unit of nonirradiated, nonleukoreduced apheresis RBCs. CONCLUSION: Use of an immunomodulating agent may have contributed to the development of TA‐GVHD in a liver transplant patient who received a random unit of nonirradiated RBCs by chance from an unrelated haploidentical donor.     

Steroid refractory psoriasiform cutaneous graft versus host disease successfully treated by extracorporeal photopheresis: A case report

Graft-versus-host disease (GVHD) is a frequent complication occurring after allogeneic hematopoietic stem cell transplantation. It can be classified as acute and chronic GVHD based on the time of onset following transplantation and clinical presentation. Cutaneous involvement is the most common feature of acute GVHD, with maculopapular exanthema and perifollicular papular lesions. Steroid refractory GVHD is associated with a significant morbidity and mortality. We present a very rare case with acute cutaneous GVHD mimicking psoriasis vulgaris occurring after allogeneic peripheral blood stem cell transplantation for chronic lymphocytic leukemia. The patient’s rash resembled psoriasis vulgaris and showed histologic features of both psoriasis and acute GVHD. Despite concomitant cyclosporine A and methylprednisolone therapy no response was obtained. Therefore, we administered extracorporeal photopheresis and achieved the desired therapeutic effect.     

异基因外周血造血干细胞移植治疗急性再生障碍性贫血--一例报告附文献复习

目的探索异基因外周血造血干细胞移植治疗急性再生障碍性贫血(再障)的疗效及其长期造血重建.方法1例急性再障患者,30岁,供者为其胞弟,HLA配型完全相合.动员方案G-CSF250?μg/d×6d.预处理方案环磷酰胺(CTX)50mg·kg-1·d-1×4d,抗胸腺细胞球蛋白(ATG)20mg·kg-1·     

Diagnosis of transfusion-associated graft-versus-host disease by genetic fingerprinting and polymerase chain reaction

A patient with Hodgkin's disease (clinical stage IIIB) received chemotherapy and total nodal irradiation. After the transfusion of filtered packed red cells, this patient developed transfusion-associated graft-versus-host disease (TA-GVHD). The genetic fingerprint of the patient's peripheral blood lymphocytes (PBLs) differed completely from that of her other body tissues. Normally, after transfusion, only the patient's own genetic fingerprints are observed in the PBLs, as exemplified in more than 10 control cases in which the transfused blood had not been filtered before transfusion. No signal bands corresponding to those of the blood donor could be demonstrated in samples of the patient's tissue DNA. Moreover, chimerism was detected in the hybridization pattern of the patient's PBLs on the ninth day after the onset of symptoms. Polymorphic simple repeats in the HLA-DRB gene after amplification by polymerase chain reaction were also investigated, which confirmed the fingerprinting results. The advantages of these methods for the diagnosis of TA-GVHD include the rapid and unequivocal diagnosis as well as the fact that there is no need for the relatives to be HLA typed.     

The fate of human Langerhans cells in hematopoietic stem cell transplantation

Langerhans cells (LC) and other antigen-presenting cells are believed to be critical in initiating graft versus host responses that influence the outcome of allogeneic hematopoietic stem cell transplantation. However, their fate in humans is poorly understood. We have sought to define the effect of conditioning regimes and graft versus host disease (GVHD) on the survival of recipient LC and reconstitution of donor cells after transplant. Confocal microscopy of epidermal sheets shows that full intensity transplant (FIT) depletes LC more rapidly than reduced intensity transplant (RIT) at day 0, although the nadir is similar in both at 14-21 d. Recovery occurs rapidly within 40 d in the absence of acute GVHD, but is delayed beyond 100 d when GVHD is active. LC chimerism was determined in sex-mismatched transplants using a two-step Giemsa/fluorescence in situ hybridization assay on isolated cells. Acquisition of donor chimerism at 40 d is more rapid after FIT (97%) than RIT (36.5%), irrespective of blood myeloid engraftment. At 100 d, all transplants achieve at least 90% LC donor chimerism and over half achieve 100%. Complete donor chimerism is associated with prior acute cutaneous GVHD, suggesting a role for allogeneic T cells in promoting LC engraftment.     

Regulation of human immunoglobulin E synthesis in acute graft versus host disease.

Immunoglobulin (Ig) E synthesis was studied in vitro in eight patients who had received transplants of allogeneic bone marrow. Seven of these patients developed acute graft vs. host disease (GVHD) and elevated serum IgE levels, whereas the eighth did not. In vitro synthesis of IgE, but not of IgG, was elevated in cultures of lymphocytes obtained during acute GVHD (17,923 +/- 14,607 pg/10(6) cells) but not in cultures of lymphocytes obtained after resolution of the acute GVHD when the serum IgE had returned to normal (106 +/- 31 pg/10(6) cells). In contrast, lymphocytes from the patient with no acute GVHD, like normal lymphocytes, failed to synthesize IgE in vitro. The increased in vitro IgE synthesis in acute GVHD was suppressed by normal allogeneic lymphocytes and by autologous lymphocytes obtained after the resolution of the acute GVHD, but not by allogeneic lymphocytes obtained from patients undergoing acute GVHD. The deficiency in functional IgE-specific suppressor cells in acute GVHD occurred in the face of normal or increased percentages of circulating T8+ cells, which in normal subjects contain the IgE-specific suppressor cells. In two patients studied, there was evidence of activated IgE-specific, circulating helper T cells. T cells from these two patients, but not normal T cells, secreted spontaneously upon culture in vitro a factor that induced IgE, but not IgG, synthesis by normal B cells. Finally, a survey of 21 bone marrow transplant recipients revealed that acute GVHD was a necessary requirement for the development of elevated serum IgE levels in recipients of bone marrow transplants. These results suggest that acute GVHD is accompanied by an imbalance in IgE-specific immunoregulatory T cells consisting of activated helper T cells and deficient suppressor cells.     

非清髓性外周血干细胞移植治疗慢性髓系白血病慢性期及加速期的疗效观察

本研究观察非清髓造血干细胞移植对慢性髓系白血病慢性期（CML—CP）、慢性髓系白血病加速期（CML—AP）的疗效。用福达华（F）30mg／m^2×6天，白消安（B）4mg／kg×2天，环磷酰胺（CTX）350mg／（m^2·d）×2天，伍用或不伍用阿糖胞苷（mra—C）对24例HLA全相合及1个位点不合者进行预处理，并对其造血恢复等指标进行动态观察。结果表明，24例患者造血顺利恢复，ANC〉0．5×10^9／L的中位时间平均为移植后13天，BPC〉20×10^9／L的中位时间平均为移植后11．5天。移植后30天经短串重复系列（STR—PCR）检测其中12例植活患者，结果9例为完全嵌合状态（CDC），3例为混合嵌合体。移植后180天时所有存活的18例患者均为CDC。中位随访24个月（4—48月），18例患者无病存活，2例患者死于严重aGVHD，1例死于cGVHD，2例死于间质性肺炎，1例死于复发。结论：非清髓造血干细胞移植是CML慢性期的有效治疗手段，对于加速期患者亦有良效。     

猕猴单倍体相合外周血造血干细胞移植后多种细胞因子mRNA表达的动态分析

本研究分析猕猴单倍体相合造血干细胞移植前后外周血单个核细胞中细胞因子（TGF-β,IL-2,IL-6,IL-10,IFN-γ,TNF-α,FAS-L）mRNA的表达并探讨这些细胞因子在急性移植物抗宿主病（aGVHD）发生和病理变化中的作用,以寻找能够早期预测和鉴别诊断aGVHD的指标.5例猕猴经非清髓预处理后接受单倍体相合外周血造血干细胞移植;半定量逆转录聚合酶链反应法（RT-PCR）检测移植前后8种细胞因子mRNA的表达,动态观察这些细胞因子在移植后aGVHD中的表达情况.结果表明：5例猕猴均成功获得造血重建.1例移植排斥,长期无病存活;其余4例为混合嵌合和完全嵌合植入,1例低比例嵌合植入经第二次;注供者外周血造血干细胞后获得高比例嵌合植入;1例发生肠道Ⅲ度GVHD.移植前后体内Th1和Th2类细胞因子都有不同程度的变化,在aGVHD期间TGF-β呈下调表达,其余均为上调表达;植入比例减低的猕猴各细胞因子也下降至移植前水平.结论：TGF-β在aGVHD发生前的下降趋势可能是GVHD预测指标,并且能够作为肠道GVHD的鉴别诊断指标.     

Fluctuating lymphocyte chimerism,tolerance and anti-tumor response in a patient with refractory lymphoma receiving nonmyeloablative conditioning and a haploidentical related allogeneic bone marrow transplant

A 51-year-old patient with refractory non-Hodgkin lymphoma (NHL) received non-myeloablative conditioning and a two of six (A, B, DR) human leucocyte antigen (HLA) mismatched donor BMT. Post-BMT lymphocytes showed fluctuating T- and natural killer (NK)-cell chimerism, which culminated in mainly donor lymphocytes by Day + 100. Changes in lymphocyte chimerism correlated with anti-donor and anti-host responses in mixed lymphocyte reaction (MLR). On Day + 100, a strong anti-host response was observed in MLR in the absence of graft-versus-host disease (GVHD), together with near complete regression of the patient's lymphoma. A mild chronic GVHD later developed and, eventually, by 680 days post-BMT, the lymphoma had relapsed and MLR reflected a state of global immune unresponsiveness. These observations demonstrate evolving host-versus-graft and graft-versus-host tolerance that correlates with fluctuating lymphoid chimerism and graft-versus-lymphoma (GVL) effects, in the absence of severe GVHD. Eventual lymphoma relapse temporally correlated with a generalised immunosuppressed state.     

异基因外周血造血干细胞移植治疗急性非淋巴细胞白血病合并肾细胞癌切除术后1例

本研究探索异基因造血干细胞移植治疗急性非淋巴细胞白血病合并肾细胞癌切除术后患者的有效性与安全性。对1例急性非淋巴细胞白血病合并肾细胞癌患者术后施行了清髓性HLA全相合的异基因外周血造血干细胞移植,预处理方案为全身照射、环磷酰胺及阿糖胞苷,移植物抗宿主病预防方案为环孢霉素A、霉酚酸酯及短程甲氨蝶呤。收集相关临床和随访资料进行分析。结果显示,该患者移植后第16天造血重建,第30天及第100天STR-PCR法检测为完全供者型嵌合,未发生急性或慢性GVHD,无严重并发症,随访44个月无病生存。结论：异基因造血干细胞移植治疗急性非淋巴细胞白血病合并肾细胞癌是可行而有效的。     

猕猴非清髓单倍相合造血干细胞移植模型的建立

为了研究用非清髓预处理是否能建立猕猴单倍相合造血干细胞移植模型，采用健康、单倍相合的亲代猕猴为供者，子代为受者。受体用氟达拉滨＋环磷酰胺＋全身照射＋兔抗人胸腺细胞球蛋白作非清髓性预处理；用环胞菌素A、霉酚酸酯、鼠抗人CD25单克隆抗体作为移植物抗宿主病（GVHD）预防方案；第0天输注供者动员后的外周血造血干细胞；定期监测造血恢复、造血嵌合水平和GVHD发生等情况。结果表明：4例猕猴用非清髓性预处理后，移植后8天内造血均能恢复，早期均有供者造血干细胞植入；例3、例4植入成功，在移植后12、14天出现Ⅱ-Ⅲ度GVHD；例1在移植后7天低比例供者植入，最后出现移植排斥；例2在移植后7天供者成分占50％，后因肾衰早期死亡。结论：用非清髓性预处理可以跨越单倍相合猕猴的MHC屏障，成功建立了单倍相合造血干细胞移植的模型。为进一步买验研究奠定了基础。     

Multiple red cell alloantibodies, including anti-Dib, after allogeneic ABO-matched peripheral blood progenitor cell transplantation

BACKGROUND: Data on red blood cell (RBC) alloantibody appearance after hematopoietic progenitor cell transplantation (HPCT) from an ABO-matched donor are limited. CASE REPORT: A 32-year-old Caucasian man with chronic myeloid leukemia, never transfused, conditioned with BuCy120, received granulocyte-colony-stimulating factor-mobilized peripheral blood progenitor cells from his HLA-identical sister. Graft-versus-host disease (GVHD) prophylaxis consisted of cyclosporine A and methotrexate. The patient engrafted showing complete donor chimerism and developed Grade 3 acute GVHD and subsequently extensive chronic GVHD. He received 2 units of RBCs on Days 13 and 14 without clinical signs of hemolysis. RESULTS: Patient was 0 Rh-K-JK(a-) and donor was 0 Rh+K-JK(a-). Pretransplant alloantibody screening was negative in the patient. In the donor, anti-E was detected before donation, together with anti-Jka and anti-Dib 4, 9, and 12 months after donation, likely triggered by RBC transfusion 2 months before cell harvest. In the patient, anti-Jka was detected on Day +25 and later anti-E and anti-Dib as well. In both, a Dia/Dia genotype was identified. Both parents were Di(a+b+). CONCLUSIONS: Three kinds of non-ABO alloantibodies were detected, including anti-Dib described for the first time after HPCT. The rapid development of antibodies in the recipient despite intensive immunosuppression suggests their production by the donor cells primed by the RBC transfusion before HPC harvest. Their production by the residual host cells cannot be unequivocally excluded, however.     

慢病毒载体介导单纯疱疹病毒胸苷激酶/更昔洛韦系统抑制移植物抗宿主病的实验研究

目的研究慢病毒载体介导单纯疱疹病毒胸苷激酶／更昔洛韦（HSV-TK／GCV）系统对小鼠异基因骨髓移植（allo—BMT）后移植物抗宿主病（GVHD）的防治作用。方法将转染HSV-TK基因的慢病毒感染供鼠（C57BL／6小鼠）脾脏淋巴细胞，将感染后的淋巴细胞与供鼠骨髓细胞混合，移植给经。Co1射线照射后的受鼠（BALB／c小鼠）。分别于移植后当天、移植后7天（＋7天）和＋12天腹腔注射GCV25mg／kg×7d，观察受鼠生存期、GVHD发生率及严重程度、T细胞亚群（CD3、CD4、CD8）及异基因嵌合等指标。结果HSV-TK／GCV使用0天、＋7天、＋12天组受鼠生存时间分别为（30．10±5．21）d、（36．40±5．28）d、（28．20±4．82）d，三组生存时间均较移植对照组[（15．10±0．43）d]明显延长（P〈0．05）；HSV-TK／GCV＋7天组小鼠50d存活率达60％，高于HSV-TK／GCV0天（40％）和＋12天组（30％）（P〉0．05）。对照组小鼠全部发生Ⅲ～Ⅳ级GVHD，实验组死亡小鼠有Ⅱ～Ⅲ级GVHD病理学改变，而长期生存小鼠仅出现Ⅰ～Ⅱ级GVHD。在＋5，＋10，＋15d，3个时间点实验组小鼠CD4^＋细胞明显高于对照组（P〈0．05），CD8^＋细胞均低于对照组（P〈0．05）。＋30天受鼠异基因嵌合率为100％。结论慢病毒载体介导的HSV-TK／GCV系统能有效控制小鼠allo—BMT后GVHD；＋7天外周血白细胞数开始回升时用GCV控制GVHD效果最佳。