Liquid biopsy and blood-based minimal residual disease evaluation in multiple myeloma

Novel drug availability has increased the depth of response and revolutionised the outcomes of multiple myeloma patients.Minimal residual disease evaluation is a surrogate for progression-free survival and overall survival and has become widely used not-only in clinical trials but also in daily patient management.Bone marrow aspiration is the gold standard for response evaluation,but due to the patchy nature of myeloma,false negatives are possible.Liquid biopsy and blood-based minimal residual disease evaluation consider circulating plasma cells,mass spectrometry or circulating tumour DNA.This approach is less invasive,can provide a more comprehensive picture of the disease and could become the future of response evaluation in multiple myeloma patients.

AML化疗期间不同时间点流式细胞术MRD检测对预后的影响

目的:探讨AML化疗期间不同时间点流式细胞术微小残留病(MRD)检测对预后的影响。方法:回顾性分析2018年3月到2022年3月确诊并规范化疗的130例成人原发AML患者,用流式细胞术检测MRD,Kaplan-Meier曲线进行生存分析,log-rank检验进行差异性分析,Cox比例风险回归模型进行影响患者生存的单因素和多因素分析。竞争风险模型进行影响患者累计复发率(CIR)的分析,Fine-Gray进行差异性分析。结果:130例患者中,CR181例,CR226例,PR 14例,NR 9例。CR1组OS高于CR2、PR、NR组。CR2组OS高于PR组,但与NR组比较无统计学差异;PR组OS与NR组比较无统计学差异。CR1和CR2的107例患者根据流式细胞术检测的MRD分组,第一次诱导化疗后MRD~-和MRD~+组患者的4年预期RFS率分别为65.3%和27.9%,4年预期OS率分别为58.7%和41.4%,4年预计CIR率分别为34.7%和69.7%,2组比较差异均有统计学意义(χ^(2)=6.639,P=0.010;χ^(2)=6.131,P=0.013;χ^(2)=6.637,P=0.010);第二次化疗后MRD~-和MRD~+组患者的4年预期RFS率分别为50.8%和37.9%,4年预期OS率分别为49.2%和44.5%,4年预计CIR率分别为49.2%和59.5%,2组比较差异均无统计学意义(χ^(2)=1.475,P=0.225;χ^(2)=2.432,P=0.119;χ^(2)=1.416,P=0.234);巩固治疗期间MRD~-和MRD~+组患者的4年预期RFS率分别为51.9%和29.6%,4年预期OS率分别为67.5%和24.6%,4年预计CIR率分别为48.1%和70.4%,2组比较差异均有统计学意义(χ^(2)=20.982,P<0.001;χ^(2)=17.794,P<0.001;χ^(2)=19.879,P<0.001);3个时间点MRD均为阴性和任一时间点为阳性患者的4年预期RFS率分别为69.9%和33.3%,4年预期OS率分别为59.1%和44.7%,4年预计CIR率分别为30.1%和65.1%,2组比较差异均有统计学意义(χ^(2)=7.367,P=0.007;χ^(2)=6.042,P=0.014;χ^(2)=7.662,P=0.006)。单因素分析结果显示,染色体高危核型是影响患者RFS和OS的不利因素,诱导化疗2个疗程达CR、第一次诱导化疗后MRD~-和第二次化疗MRD~-是患者RFS和OS的保护因素;巩固治疗期间MRD~-和3个时间点MRD~-是患者RFS、OS和CIR的保护因素。多因素分析结果显示,诱导化疗2个疗程达CR是患者RFS和CIR的保护因素,巩固治疗期间MRD~-是RFS、OS和CIR的保护因素。结论:成人AML患者早期获得CR和MRD~-,特别是巩固治疗期间的MRD~-是预后良好的标志,流式细胞术是AML患者MRD检测最常用的方法。

Donor-Derived CD19-Targeted T Cell Infusion Eliminates B Cell Acute Lymphoblastic Leukemia Minimal Residual Disease with No Response to Donor Lymphocytes after Allogeneic Hematopoietic Stem Cell Transplantation

Leukemia relapse is still the leading cause of treatment failure after allogeneic hematopoietic stem cell transplantation (allo-HSCT) for B cell acute lymphoblastic leukemia (B-ALL). Relapsed patients with BALL after allo-HSCT have a very short median survival. Minimal residual disease (MRD) is predictive of forthcoming hematological relapse after hematopoietic stem cell transplantation (HSCT);furthermore, eliminating MRD effectively prevents relapse. Donor lymphoblastic infusion (DLI) is the main established approach to treat B-ALL with MRD after allo-HSCT. However, about one-third of patients with MRD are non-responsive to DLI and their prognosis worsens. Although donor-derived cluster of differentiation (CD)19-directed chimeric antigen receptor-modified (CAR) T cells (CART19s) can potentially cure leukemia, the efficiency and safety of infusions with these cells have not yet been investigated in patients with MRD after HSCT. Between September 2014 and February 2018, six patients each received one or more infusions of CART19s from HSCT donors. Five (83.33%) achieved MRD-negative remission, and one case was not responsive to the administration of CAR T cells. Three of the six patients are currently alive without leukemia. No patient developed acute graft-versus-host disease (aGVHD), and no patient died of cytokine release syndrome. Donor-derived CAR T cell infusions seem to be an effective and safe intervention for patients with MRD in B-ALL after allo-HSCT and for those who were not responsive to DLI.

A comparison of flow cytometry detection of minimal residual disease and chimerism kinetics in chronic lymphocytic leukemia patients after allogeneic hematopoietic stem cell transplantation

Determination of minimal residual disease (MRD) remains crucial for the follow-up after therapy in chronic lymphocytic leukemia (CLL) patients. Chimerism was assessed by short tandem repeat (STR)-PCR and single nucleotide polymorphisms (SNP)-PCR, and MRD by a multicolor flow cytometric approach in 12 consecutive patients with CLL after they received allogeneic stem cell transplantation (SCT). Overall, 11 patients achieved MRD flow negativity [10 had full donor chimerism (FDC) and one had mixed chimerism (MC)]. Only one patient remained with MRD flow positivity and displayed MC. Fifty-six samples were concomitantly studied by both chimerism and MRD flow. A significant correlation was observed between MRD flow data and chimerism in both PB and BM by using a mixed effect linear regression (p < 0.001). Flow cytometry approach of MRD can be easily combined with chimerism during the follow-up post-allogeneic SCT. Both techniques appeared complementary for guiding post-transplant immunomodulation.

Coexisting opportunities and challenges:In which scenarios can minimal/measurable residual disease play a role in advanced non-small cell lung cancer?

Curative therapy was not previously available for patients with advanced non-small cell lung cancer(NSCLC);thus,the concept of minimal/measurable(or molecular)residual disease(MRD)was not applicable to these patients.However,advances in targeted and immunotherapy have revolutionized the treatment landscape for patients with advanced NSCLC,with emerging evidence of long-term survival and even the hope of complete remission(CR)by imaging examination.The latest research shows that patients with oligometastatic lung cancer can benefit from local treatment.After removing the lesions,the choice of follow-up therapy and monitoring of the lesions could remain uncertain.MRD plays a role in identifying early-stage NSCLC patients with high risks of recurrence and determining adjuvant therapy after radical treatment.In recent years,evidence has been accumulating regarding the use of circulating cell-free tumor DNA(ctDNA)to assess MRD in solid tumors.This study discussed the possible applications of ctDNA-based MRD monitoring in advanced NSCLC and described the current challenges and unresolved problems in the application of MRD in advanced NSCLC.

Prognostic relevance of minimal residual disease in colorectal cancer

Presence of occult minimal residual disease in patients with colorectal cancer(CRC)has a strong prognostic impact on survival.Minimal residual disease plays a major role in disease relapse and formation of metastases in CRC.Analysis of circulating tumor cells(CTC)in the blood is increasingly used in clinical practice for disease monitoring of CRC patients.In this review article the role of CTC,disseminated tumor cells(DTC)in the bone marrow and micrometastases and isolated tumor cells(ITC)in the lymph nodes will be discussed,including literature published until September 2013.Occult disease is a strong prognostic marker for patient survival in CRC and defined by the presence of CTC in the blood,DTC in the bone marrow and/or micrometastases and ITC in the lymph nodes.Minimal residual disease could be used in the future to identify patient groups at risk,who might benefit from individualized treatment options.

DETECTION AND ITS CLINICAL VALUE OF MINIMAL RESIDUAL DISEASES IN ACUTE PROMYELOCYTIC LEUKEMIA

Objective: To detect the minimal residual diseases (MRD) in acute promyelocytic leukemia (APL) after complete remission (CR) and to analyze its clinical value in prognosis. Methods: Reverse transcription Polymerase chain reaction (RT/PCR) was used to detect MRD of patients with APL. Results: MRD positive rate in patients with APL was 92.8% (39/42) before treatment and 56.7 (21/37) immediately after the ATRA or chemotherapy-induced CR. Furthermore, MRD positive rate was related to the relapse in APL patients and could be considered as a marker to predict the relapse of patients with APL after CR. The MRD detection could also be applied to direct the consolidation therapy to prevent relapses. Conclusion: RT-PCR is valuable to monitor MRD and can be used as a marker to predict relapses.

Study of Minimal Residual Disease in Adults with B-Lineage Acute Lymphoblastic Leukemia by Flowcytometry

Background: After achieving morphological remission, existence of few number of leukemic cells in the patient’s blood represents the minimal residual disease (MRD) and its monitoring helps in evaluating early treatment response and future relapse. Patients and methods: Eighty seven newly diagnosed (B-ALL) cases were enrolled in the present study in the time period from October 2013 to October 2016. A panel of 4 monoclonal antibodies (CD10FITC, CD19PE, CD34PercP and CD45APC) were defined at diagnosis and after morphological remission for tracing of minimal residual disease (MRD). Results: Eighty seven newly diagnosed B-ALL cases were included in the present study of which 73 (84%) showed positive expression to CD45 in combination with (CD10, CD19 and CD34) at diagnosis, which allow us to use this combination for further assessment of MRD after morphological remission. In our study 65% of patients had negative MRD ( Conclusion: MRD detection by flow cytometry using the combination of CD45 with CD10, CD19 & CD34 is an easy and reliable method. Patients with positive MRD are at higher risk of relapse and have inferior overall survival rates compared to those with MRD-ve. Future studies focusing on treatment intensification for the group of patients with +ve MRD aiming to improve the treatment outcome are warranted.

CLINICAL SIGNIFICANCE OF THE DETECTION OF MINIMAL RESIDUAL DISEASE IN CHILDHOOD B-ALL BY FLOW CYTOMETRY

Objective To detect the minimal residual disease in children with B-ALL and to evaluate its clinical significance by flow cytometry. Methods 58 childhood B-ALL cases were enrolled into this study and 33 MRD analyses were performed after remission induction therapy.Four-color combinations of fluorochrome labeled monoclonal antibodies against lymphocyte lineage related phenotypes were used to analyze leukemic cells with flow cytometry.The cells from normal bone marrow were used as controls.The combinations of phenotypes that reflect the antigen expression differences between leukemic and normal bone marrow cells on flow cytometry were considered to be the effective phenotype combinations in the first step screening.The effective phenotype combinations were then used to monitor MRD during the disease course after therapy began. Results 58 cases of childhood B-ALL were screened for MRD effective phenotype combinations.The effective phenotype combinations were identified in 89.7% of B-ALL cases in this study.Four-color phenotype combinations were composed of CD10/CD34/CD19 plus another effective marker such as CD38,CD58,CD66c,CD21.The senstitivity of this method was 0.01%,much higher than that of microscopic inspection.In 8 cases,their bone marrow microscopic inspection results showed no remaining leukemic cells;but with flow cytometry,the percentage of leukemic cells were 5.66%,0.36%,1.43%,0.069%,1.55%,2.7%,0.028% and 0.015%,respectively.In risk stratification,all these MRD positive cases were classified into high risk group for relapse and 1 case showed early relapse within 6 months. Conclusion The application of flow cytometry in MRD measurement can significantly improve the sensitivity of detection of remained leukemic cells in childhood B-ALL,and can provide more accurate information on disease progression as well as the efficacy of therapy,thus facilitate future treatment decisions and follow ups.

Brentuximab Vedotin Monotherapy and Combined with Low Dose Donor Lymphocyte Infusion to Control Minimal Residual Disease and Sustain Clinical Remission in a Child with Relapsed Anaplastic Large Cell Lymphoma

Minimal residual disease (MRD) appears to have a strong negative predictive value for disease recurrence in children with anaplastic large cell lymphoma (ALCL). Brentuximab vedotin (BV) can be a therapeutic option for MRD-positive patients to achieve molecular remission and to decrease risk of subsequent relapse. We here report a 4-year-old child with ALCL progression during relapse treatment who received BV as a bridging therapy before haploidentical hematopoietic stem-cell transplantation, and as a maintenance therapy post-transplant alone or combined with simultaneous low dose donor-lymphocyte infusions. MRD monitoring showed a complete molecular response and reflected both BV efficiency and graft-versus-lymphoma effect.

移植前控制营养状况和移植后微小残留病灶对多发性骨髓瘤患者自体造血干细胞移植预后的影响

目的:探讨多发性骨髓瘤患者自体造血干细胞移植前控制营养状况(CONUT)和移植后微小残留病灶对预后的影响。方法:回顾性分析2011-2020年在本院行自体造血干细胞移植的79例患者的临床资料,根据首次移植前CONUT评分将患者分为Low-CONUT组(0-4分,62例)和High-CONUT组(5-12分,17例),对比分析两组患者的临床特征、造血重建与不良反应、疗效和生存情况,同时对预后进行危险因素分析,并用时间依赖的ROC曲线验证结果。结果:High-CONUT组男性患者比例和初诊时骨髓浆细胞>30%的患者比例均较Low-CONUT组高(均P<0.05),而在造血重建与不良反应(2级以上的非血液学不良反应)方面无显著差异。Low-CONUT组移植前完全缓解率、完全缓解+非常好的部分缓解率都显著高于High-CONUT组(均P<0.05),移植后3个月后者优势仍然保持(P<0.01),但前者已无显著差异(P>0.05)。Low-CONUT组总生存期、无进展生存期均优于High-CONUT组(均P<0.05)。移植前的CONUT评分低(0-4分)、移植后6个月微小残留病阴性是患者总生存期和无进展生存期的有利因素(均P<0.05),初诊时国际骨髓瘤工作组预后危险分层为高危和移植前乳酸脱氢酶>250 U/L仅是无进展生存期的危险因素(均P<0.05)。时间相关的ROC曲线分析提示,CONUT评分和移植后6个月微小残留病灶状态可单独或联合预测1和2年总生存期、无进展生存期,且联合预测效果更好。结论:结合移植前CONUT评分和移植后微小残留病灶状态可以较好地预测多发性骨髓瘤患者的预后。

IgH基因重排在多发性骨髓瘤自体造血干细胞移植后微小残留病监测中的价值

目的:探讨免疫球蛋白重链(IgH)基因重排在多发性骨髓瘤(MM)自体造血干细胞移植(auto-HSCT)后微小残留病监测中的价值。方法:收集2018年-2022年于武汉市第一医院血液内科接受auto-HSCT的26例MM患者的临床资料,通过多重PCR联合毛细管电泳片段分析法检测IgH重排来评价微小残留病(MRD),对疾病的转归进行相关统计学分析。结果:全部26例MM患者中,男性18例,女性8例,中位年龄59(41-70)岁,移植后中位随访时间33(7-52)个月。与骨髓IgH重排阴性组(17例)比较,移植前骨髓IgH重排阳性(9例)患者移植后3个月达到CR和sCR疗效的比例更低(1/9 vs 14/17),移植后缓解持续的时间(DOR)更短(10.78±4.35 vs 15.88±5.22个月),两组DOR差异有统计学意义(P<0.05);与外周血干细胞采集物IgH重排阴性组(21例)比较,外周血干细胞采集物IgH重排阳性(5例)患者移植后3个月达到CR和sCR的比例更低(0/5 vs 15/21),移植后缓解持续的时间(DOR)更短(9.60±4.83 vs 15.19±5.11个月),两组DOR差异有统计学意义(P<0.05)。在随访期内,移植前骨髓IgH重排阳性的患者有5例(5/9)死亡,IgH重排阴性患者均存活;外周血干细胞采集物IgH重排阳性患者有4例(4/5)死亡,IgH重排阴性患者有1例死亡(1/21)。无论是骨髓还是外周血干细胞采集物标本,IgH重排阳性患者移植后生存时间较IgH重排阴性患者更短(P<0.05)。Logistic回归分析结果显示,性别、疾病分期、初诊时骨髓涂片浆细胞比例、干细胞动员方案、移植前疗效评价(≥CR和<CR)、CD34+细胞计数对移植前骨髓及干细胞采集物IgH重排均无影响(P>0.05)。结论:通过检测接受auto-HSCT的MM患者IgH重排,可以进一步评价MRD的深度,对疾病的疗效及预后判断有一定的指导意义。

极限稀释定量PCR法动态监测儿童急性淋巴细胞性白血病MRD

为探讨一种简便易行检测儿童急性淋巴细胞性白血病 (AL L)微小残留白血病 (MRD)的方法 ,应用 Chelex10 0为介质抽提 4 1例 AL L 患儿不同病期未染色骨髓涂片 DNA,以 TCR Vδ2 Dδ3基因重排为标志 ,采用极限稀释定量PCR法扩增 ,动态监测 MRD的消长与临床病情变化的关系。结果发现 :2 4例患儿在初诊时检出 TCR Vδ2 Dδ3基因重排(5 9% ) ,灵敏度均为 4个拷贝。经诱导缓解后 ,12例 TCR Vδ2 Dδ3基因重排仍为阳性 ,MRD值为 2× 10 - 6 ～ 1× 10 - 3,其中 7例 MRD值于 3～ 6个月内迅速下降转阴 ,骨髓检测未见复发 ,另 5例 MRD持续阳性或 MRD持续高值 ,早期复发。骨髓检测复发患儿缓解期时 MRD平均值为 1.9× 10 — 3明显高于同期骨髓检测未复发患儿的 3× 10 - 6 (P<0 .0 1)。余 12例诱导缓解后 TCR Vδ2 Dδ3基因重排转阴 ,MRD值均 <1× 10 - 6 ,其中 3例 MRD由阴性转阳后加强化疗力度 ,未复发。结果提示 :以 Chelex 10 0为介质抽提 DNA进行 PCR扩增 ,操作简便 ,敏感度高 ;动态监测 MRD的消长对指导临床治疗 。

初发急性髓系白血病诱导化疗后外周血MRD早期检测与临床疗效的关系

本研究旨在检测初发急性髓系白血病(AML)患者诱导化疗第8天外周血残存的白血病细胞数量,探索其与诱导缓解及生存时间之间的关系。收集华西医院血液科2009年9月至2010年6月的29例初发AML患者的临床和实验室资料,其中男13例,女16例,中位年龄41(16-75)岁。根据初诊时白血病相关免疫表型特征(LAIP),采用流式细胞术检测患者诱导化疗第8天外周血微小残留病(MRD)细胞数量;应用Kaplan-Meier法计算生存曲线,对数秩检验进行单因素生存分析,观察患者外周血化疗第8天MRD水平与治疗后完全缓解率(CR)及总体生存率之间的关系。结果表明,29例AML患者经第1疗程化疗后,7例外周血MRD水平低于0.01%(阴性组),其余22例外周血MRD水平高于0.01%(0.08%-55%,阳性组);两组患者在性别、年龄、WBC、乳酸脱氢酶水平、骨髓原始细胞比例等均无统计学差异。7例MRD阴性组中6例达CR(86%),22例MRD阳性组中6例达CR(27%),CR率差异有统计学意义(P<0.05)。随访时间1-28个月(中位时间15个月),MRD阴性组患者中位生存期为19个月,MRD阳性组患者中位生存期为9个月(P<0.05),MRD阴性组1年生存率(100%)明显高于阳性组(39.4%,P<0.01)。结论:采用流式细胞术检测AML患者诱导化疗后第8天外周血MRD水平能较好的预测患者的CR率与长期生存率,MRD阴性患者有更高的CR率和更长的生存期。

CD7、CD56、CD19在AML预后及MRD监测中的意义

目的探讨急性髓系白血病伴淋系抗原(Ly+-AML)表达者在预后及白血病微小残留病(MRD)监测中的临床意义。方法利用流式细胞术(FCM)对86例AML进行免疫分型,并以CD7、CD56、CD19为标志进行MRD检测。结果交叉表达现象在M5中出现频率最高,其次为M2;CD7表达在Ly+-AML中最常见;首次化疗形态学完全缓解(CR)率Ly+-AML病例低于Ly--AML病例;2年死亡率Ly+-AML病例高于Ly--AML病例;在MRD阳性检出率方面,CD7+AML组与Ly--AML组之间差异有统计学意义(P1<0.05),CD56+AML组与Ly--AML组之间差异有统计学意义(P2<0.05),CD19+AML组与Ly--AML组之间差异无统计学意义(P3>0.05)。讨论 Ly+-AML与Ly--AML有不同的临床特点,CD7+AML和CD56+AML预后差;CD7、CD56可以作为MRD监测的重要指标。

DC-CIK细胞用于治疗急性髓系白血病MRD的研究

目的:探讨DC-CIK细胞治疗急性髓系白血病微小残留病灶的疗效。方法:对11例经化疗后MRD阳性的急性髓系白血病患者进行DC-CIK过继免疫治疗,并用FCM监测MRD变化。结果:经FCM检测,11例患者中7例MRD转阴,并处于持续完全缓解状态,其余4例(M21例,M42例,M51例)均复发。结论:DC-CIK过继免疫治疗具有清除急性髓系白血病MRD的作用。

免疫治疗开启新辅助新篇,精准策略探索前路漫漫——评NSCLC新辅助免疫治疗的机遇与挑战

1文献来源Liu SY,Dong S,Yang XN,et al.Neoadjuvant nivolumab with or without platinum⁃doublet chemotherapy based on PD⁃L1 expression in resectable NSCLC(CTONG1804):a multicenter open⁃label phaseⅡstudy[J].Signal Transduct Target Ther,2023,8(1):442.2证据水平2a。

流式细胞仪与显微镜联合检测MRD的临床价值

目的了解流式细胞仪与显微镜联合检测微小残留白血病细胞(MRD)的临床价值。方法采集已确诊的白血病患者65例经化疗完全缓解(CR)后的骨髓,同时用四色多参数流式细胞仪和奥林巴斯显微镜做MRD检测共233次,检测急性白血病患者完全缓解后治疗过程中不同时间点的MRD。结果 65例急性白血病患者诱导治疗缓解达CR后的233次MRD检测中,流式细胞仪MRD检测阳性率为55.4%(129/233例);显微镜FAB形态学方法检测阳性率为35.63%(83/233例)。流式细胞仪MRD监测的阳性率明显高于显微镜FAB形态学检测,两种方法结果比较,差异有统计学意义(P<0.01);233次MRD检测中59次显微镜形态学检测阴性而流式细胞仪检测阳性,13次显微镜检测阳性而流式细胞仪检测阴性。结论用四色多参数流式细胞仪能快速有效地对急性白血病患者进行MRD检测;用流式细胞仪与显微镜联合检测MRD,可避免因白血病细胞在治疗过程中某些标志丢失或改变而造成MRD假阴性,进一步提高MRD阳性检出率,对于提高急性白血病患者的生存率及生存质量和疗效评估及预后监测都具有重要意义。

MRD监测下88例儿童急性B淋巴细胞白血病长期疗效的分析

目的对88例儿童急性B淋巴细胞白血病（B—ALL）治疗的长期随访结果进行分析，探讨微小残留病（MRD）监测下儿童B—ALL的无事件生存率（EFS）。方法回顾性分析2005年1月．2008年5月接受儿童ALL诊疗建议（第三次修订草案）治疗的88例B．ALL患儿，应用流式细胞术（FCM）检测MRD，采用Kaplan—Meier方法评估患儿EFS，各临床危险度分组间患儿EFS差异用Logrank检验。结果88例患儿骨髓完全缓解（CR）率为97．7％，2年、3年、4年、5年EFS率分别为87．5％、86．4％、81．8％、77．2％，标危、中危、高危5年EFS率分别为86．2％、84．6％、63．1％。5例死亡，9例复发（10．5％），复发中位时间为23（3—59）个月。结论采用儿童ALL诊疗建议（第三次修订草案）治疗CR率较高，在MRD监测下指导治疗，总体上B—ALL患儿的5年EFS提高。

扶正透毒祛毒复方对髓系MRD-L患者CD34^+细胞源DC诱导过程中IL-2、sIL-2R的影响

【目的】研究扶正透毒祛毒复方(加味青蒿鳖甲汤)中药含药血清对髓系微小残留白血病(minimal residual disease in leukemia,MRD-L)患者CD34+细胞源树突状细胞(DC)诱导培养的不同阶段血清中白细胞介素-2(IL-2)、可溶性白细胞介素-2受体(sIL-2R)的含量变化,探讨扶正透毒祛毒复方影响MRD-L患者CD34+细胞源DC诱导及生物学效应的机制。【方法】将急性髓系白血病缓解期(AML-CR)患者骨髓经Ficoll密度梯度离心获得骨髓单个核细胞(BMNC)后,用免疫磁珠阳性选择法提取CD34+细胞,培养扩增后用不同浓度中药含药血清与细胞因子进行体外培养诱导DC,培养过程中观察细胞的形态,流式细胞仪检测DC表面CD83、CD80、CD86、CD1a、人白细胞DR抗原(HLA-DR)的表达。在培养的第0天、第6天和第9天采用酶联免疫吸附(ELISA)法分别检测、比较各组血清中IL-2、sIL-2R的含量。【结果】(1)各中药含药血清联合细胞因子组能促进CD34+细胞分化为形态特征典型的DC,并高表达CD83、CD80、CD86、HLA-DR等DC的表面标志,与胎牛血清及空白兔血清组比较差异有统计学意义(P<0.01),中药中剂量及低剂量含药血清组能促进CD1a的表达提高,与中药高剂量组、细胞因子组比较差异有统计学意义(P<0.01)。(2)IL-2含量:含药血清制成后(第0天),各中药含药血清组均高于空白兔血清组;各中药含药血清联合细胞因子组第9天、第6天均高于第0天,中药中剂量联合细胞因子组第9天显著高于第6天(P<0.01),中药高剂量联合细胞因子组第9天高于第6天(P<0.05);在同一时间内,各中药含药血清联合细胞因子组均高于空白兔血清组。(3)sIL-2R含量:含药血清制成后(第0天),各中药含药血清组均低于空白兔血清组;各中药含药血清联合细胞因子组第9天均显著低于第0天、第6天(P<0.01),中药高剂量联合细胞因子组第6天低于第0天(P<0.05),其余各组第6天与第0天比较差异无统计学意义(P>0.05);在同一时间内,各中药含药血清联合细胞因子组均低于空白兔血清组(P<0.05或P<0.01)。【结论】扶正透毒祛毒复方能增加血清IL-2的含量和降低sIL-2R的水平,随着DC的不断成熟,其含量变化更加明显,可能对CD34+细胞向DC转化发挥了积极作用。