同胞相合异基因造血干细胞移植受者移植前胸腺近输出功能与预后相关性研究

目的通过同胞相合异基因造血干细胞移植（allo—HSCT）受者移植前胸腺近输出功能与预后相关性研究，判断能否将受者移植前的胸腺近输出功能作为预后的指标。方法应用Real—time PCR的方法定量检测64例同胞全相合骨髓移植（MSD—BMT）患者移植前T细胞受体重排删除环（TREC）水平（作为胸腺近输出功能），并对所有移植后病例临床资料进行收集整理。通过统计学分析进行回顾性研究，用Log-rank检验比较生存率，运用COX比例风险回归模型进行单因素和多因素统计分析。同时检测70名正常供者的TREC水平作为正常对照。结果70名正常人外周血单个核细胞中TREC拷贝数为（3351±3711）拷贝／10^5细胞，年龄与TREC含量呈负相关。移植前患者TREC定量检测结果为（180±332）拷贝／10^5细胞，明显低于正常人。COX回归模型单因素分析显示移植前TREC水平与移植后长期生存、慢性移植物抗宿主病（cGVHD）有明显的相关性（P〈0．05），与CMV感染亦有一定的相关性（P=0．084），而与急性移植物抗宿主病（aGVHD）的发生无明显的相关性。COX回归模型多危险因素的分析结果显示，受者移植前TREC水平与移植后长期生存、cGVHD、CMV感染（P=0．07）等具有相关性，与aGVHD的发生无明显相关性。其结果与单一TREC因素对移植后的预后指标的影响一致。结论接受MSD—BMT患者移植前的胸腺近输出功能与移植预后具有明显的相关性，可以作为影响allo—HSCT后独立的预后因素。

Study on relationship between pretransplantation host thymic recent output function and prognosis in HLA-matched sibling hematopoietic stem cell transplantation

OBJECTIVE: To study the relationship between pretransplantation host thymic recent output function and prognosis in HLA-matched sibling bone marrow transplantataion (MSD-BMT) and determine whether pretransplantation host thymic recent output function can act as a marker for predication of prognosis after HSCT. METHODS: T-cell receptor excision circle (TREC) in DNA of pretransplantation peripheral blood mononuclear cells from 64 patients underwent MSD-BMT was detected by real-time quantitative PCR. The content of TREC in 70 normal donors was detected as well. All clinical data of patients after HSCT were collected and studied. Survival rates of patients after HSCT were estimated with Log-rank test. Univariate and multivariate analysis of prognostic factors were carried out by COX's proportional hazard regression model. RESULTS: The mean value of TREC in normal donors was (3351 +/- 3711) copies/10(5) cells. There was an inverse correlation between TREC and age in the donor groups. Before transplantation, all patients were detected TREC, with a mean TREC number of (180 +/-332) copies/10(5) cells being significantly lower than that of normal donors. The results of univariate analysis showed that the counts of pre-HSCT TREC were closely, correlated with long term survival and chronic graft versus host disease (cGVHD) (P < 0.05) and with CMV infection (P = 0.084) but not with acute graft versus host disease (aGVHD). The results of multivariate analysis showed the same thing as that of univariate analysis. CONCLUSION: Pretransplantation host thymic recent output function is closely correlated with prognosis in MSD-BMT and can be a factor for predicting the outcome of HSCT.