不同血细胞分离机采集程序对健康供者造血干细胞采集物细胞成分的影响

目的:观察COBE Spectra血细胞分离机AutoPBSC程序以及Spectra Optia血细胞分离机MNC程序对采集的健康供者外周血造血干细胞成分的影响。方法:2015年1月至2016年8月期间对12例供者随机应用COBE Spectra血细胞分离机AutoPBSC程序以及Spectra Optia血细胞分离机MNC程序进行外周血造血干细胞采集,观察应用不同采集程序获得的采集物中单个核细胞、CD34~+细胞、粒细胞、淋巴细胞、血小板数的差异。结果:两种采集程序在循环血量、采集时间及抗凝剂使用量方面无显著差异。COBE Spectra血细胞分离机AutoPBSC程序采集的采集物体积及单个核细胞计数均低于Spectra Optia血细胞分离机MNC程序的采集物体积及单个核细胞计数。AutoPBSC程序采集的CD34~+细胞计数高于MNC程序采集的CD34~+细胞计数。AutoPBSC程序采集物中混入的淋巴细胞及血小板较MNC程序中多,其差异均有统计学意义(P0.05)。结论:与Spectra Optia血细胞分离机MNC程序相比,COBE Spectra血细胞分离机AutoPBSC程序采集的造血干细胞数量多,混入的淋巴细胞及血小板多。     

两种不同程序采集外周血造血干细胞的效果比较分析

目的研究COBE Spectra血细胞分离机的2种不同程序采集外周血造血干细胞的效果与优缺点。方法将152例次外周血造干细胞采集术随机分成2组,分别使用Auto PBSC程序和MNC程序,将2组采集后的干细胞(PBSC)各种数值进行比较,同时比较2组被采集者术后的外周血液指标变化。结果在获得PBSC中的单个核细胞(MNC)总数相当的情况下,Auto PBSC程序采集的产品体积少于MNC程序(P<0.05),单个核细胞和CD34+细胞纯度提高(P<0.05),其中混有的血小板数和红细胞数也少于后者(P<0.05)。采用Auto PBSC程序的供/患者,其外周血的Plt下降明显低于采用MNC程序者(P<0.05),但Auto PBSC程序采集所耗时间与总循环血量要高于MNC程序(P<0.01),MNC程序在短时间内大容量的干细胞采集上具有优势。结论 2种程序各有优缺点,应根据供/患者具体状况选择不同的采集方法,以达到最佳采集效果。     

应用白细胞管路采集外周造血干细胞的效果评价

目的采用美国COBE Spectra血细胞分离机,比较Auto PBSC管路和白细胞管路采集外周血造血干细胞的效果。方法选择供者/患者接受外周血造血干细胞单采46例64人次,AutoPBSC管路采集21例31人次,平均年龄（32.75±10.26）岁,白细胞管路采集25例33人次,平均年龄（31.47±14.21）岁;比较两组采集产品MNC、CD34＋细胞数、采集效率、采集产品体积、红细胞和血小板含量,无出血倾向和不良反应。结果两组采集产品的MNC、CD34＋细胞数、采集效率、红细胞和血小板含量的差异均无统计学意义;MNC白细胞管路组采集产品体积高于Auto PBSC管路组。64例供者采集后均无出血倾向,仅有5例出现轻度不良反应。结论两组管路采集外周血干细胞的效果无差异,采集产品需超低温冰冻保存者使用Auto PBSC管路组采集更为高效经济和安全。     

血细胞分离机不同采集程序对外周血造血干细胞分离效果的影响

目的:观察COBE Spectra血细胞分离机Auto PBSC程序、MNC程序及Spectra Optia血细胞分离机MNC程序采集自体外周血造血干细胞的效果及不良反应。方法:对41例采集对象分别采用COBE Spectra血细胞分离机Auto PBSC程序、MNC程序及Spectra Optia血细胞分离机MNC程序进行自体外周血造血干细胞采集,观察3种采集程序采集的MNC及CD34~+细胞数、采集后患者血红蛋白及血小板下降的差异以及3种采集程序采集过程中的不良反应。结果:在全血处理量及采集时间基本相同的情况下,COBE Spectra和Spectra Optia的MNC程序采集的MNC数较COBE Spectra Auto PBSC程序采集的数高,但采集的CD34~+细胞数均低于Auto PBSC程序采集的CD34~+细胞数(P0.05)。COBE Spectra和Spectra Optia的MNC程序采集的终产物体积大于Auto PBSC程序采集的终产物体积。Spectra Optia血细胞分离机MNC程序与COBE Spectra血细胞分离机MNC程序相比,采集的M NC数无显著差异,但Spectra Optia血细胞分离机M NC程序采集的CD34~+细胞数大于COBE Spectra血细胞分离机MNC程序采集的CD34~+细胞数(P0.05)。Spectra Optia的MNC程序采集后患者血小板及血红蛋白较采集前下降幅度最低(P0.05)。3种程序采集过程中的不良反应相似,患者均可耐受。结论:COBE Spectra血细胞分离机Auto PBSC程序和Spectra Optia血细胞分离机MNC程序采集自体外周血造血干细胞优于COBE Spectra血细胞分离机的MNC程序。Spectra Optia的MNC程序采集后患者血小板及血红蛋白损失最低。     

外周血造血干细胞采集方法的选择与分析

目的以Cobe Spectra细胞分离系统为基础,为外周血造血干细胞的采集选择效率高,经济、运行时间短,更切合临床实际工作的方法提供客观依据。方法分别用Cobe Spectra细胞分离系统的Auto PBSC(外周血干细胞自动采集)方法和MNC(单个核细胞采集)方法采集外周血干细胞,对采集产品的进行细胞计数,记录采集过程参数,计算有核细胞、单个核细胞采集数和采集时间,分析采集效率以及经济成本。应用统计学分析方法,对这2种不同方法进行比较分析。结果 1)2组间处理血量差异没有统计学习意义,Auto PBSC采集组的采集产品中有核细胞数浓度和单个核细胞百分比高于MNC采集组,但产品体积小于MNC采集组(T=-1.704,0.494,1.941,1.742,P>0.05);2)MNC采集组获得的产品中有核细胞总数、单个核细胞数及CD34+细胞浓度均显著高于AutoPBSC采集组,采集所用的时间差异无统计学意义(T=-3.596,-0.349,13.188,-2.554,-2.818,P<0.05);3)MNC采集组的有核细胞采集率(22%)和单个核细胞的采集率(97.7%)也高于Auto PBSC采集组的15%和85%(T=5.5754,.572,4.3842,.926,-0.044,3.229,P<0.05)。结论 MNC采集外周血干细胞的采集效率优于AutoPBSC采集,并且经济。     

血细胞分离机AutoPBSC程序与MNC程序采集外周血干细胞的效果比较及影响因素分析

本研究旨在分析COBE Spectra血细胞分离机自动采集程序（Auto PBSC程序）与半自动采集程序（MNC程序）在外周血干细胞采集中的效果及影响因素。109例采集按对象不同分为自体患者组（患者）和异基因供者组（供者）,通过对采集物中干细胞数量与质量及采集程序特点的比较,对两种采集程序在两组中的采集结果及影响因素分别进行了分析。结果表明,在全血处理量基本相同的情况下,患者组和供者组两种程序采集物中MNC%与CD34^＋%、CD34^＋细胞数及血红蛋白含量差异无显著性（P〉0.05）;与MNC程序比较,Auto PBSC程序采集物中血小板混入少,采集物体积小,但抗凝剂用量多,采集时间长（P〈0.05）。相关性分析显示,患者组两种程序采集物中MNC数（r=0.314,P=0.015）、CD34^＋细胞数（r=0.922,P=0.000）与采集前对应参数呈正相关,采集物中CD34^＋细胞数与WBC数（r=0.369,P=0.004）及MNC数（r=0.495,P=0.000）呈正相关;供者组Auto PBSC程序采集物中MNC数与采集前呈正相关（r=0.896,P=0.000）,MNC程序采集物中CD34^＋细胞数与采集前呈正相关（r=0.666,P=0.000）。患者组Auto PBSC程序采集物中MNC数与CD34^＋细胞数在男性显著高于女性（P〈0.05）,在年龄40岁以下的患者显著高于年龄在40岁以上的患者（P〈0.05）,而MNC程序年龄在40岁以上患者采集的CD34^＋细胞数显著高于年龄40岁以下患者（P〈0.05）。供者组仅MNC程序采集物中MNC数与CD34^＋细胞数在男性显著高于女性（P〈0.05）。结论：在全血处理量相同时,自体患者和异基因供者PBSC采集中两种程序收获的MNC纯度与CD34^＋细胞纯度及浓度高度一致,但自体患者PBSC采集结果受年龄与性别影响较大。     

健康供者外周造血干细胞采集的护理

目的 总结健康供者外周造血干细胞采集过程的护理。方法 对健康供者采集外周造血干细胞进行全程护理。结果 22例健康供者均顺利完成外周血造血干细胞采集,不良反应较少,采集物单个核细胞数(MNC)和CD34+细胞数均达到移植要求。结论 正确的护理可以顺利、高质量地完成健康供者外周血造血干细胞的采集。     

Amicus与CS-3000血细胞分离机采集外周血造血干细胞效果比较

目的 探讨Amicus与CS-3000血细胞分离机采集外周血造血干细胞的效果.方法 供者均给予G-CSF动员,分别采用Amicus血细胞分离机的MNC程序和CS-3000血细胞分离机的单个核细胞程序采集供者外周血干细胞;用流式细胞仪检测所采集干细胞的CD34+细胞数.供者52例,共采集62次,其中Amicus血细胞分离...     

两种血细胞分离机干/祖细胞采集效果及供者采集前后血液指标变化的比较

目的比较Fenwal CS-3000 Plus(以下简名称Fenwal)与Amicus 2种血细胞分离机分离外周血造血干/祖细胞的效果及干/祖细胞采集后供者血液指标的变化。方法共有56名供者入组,Fenwal组32名,年龄(36.2±11.6)岁,选择单个核细胞采集程序,共循环37次;Amicus组24名,年龄(35.4±12.1)岁,选择MNC采集程序共循环27次。比较2组采集物白细胞总数、单个核细胞百分率、CD34+细胞数及采集前后供者Hct、Plt的变化。结果2组采集物的白细胞数、单个核细胞百分率、CD34+细胞数、采集效率均差异无统计学意义;2组采集后供者Plt下降率Fenwal组供者较Amicus组高;2组采集后供者Hct下降率差异无统计学意义;2组采集物中MNC、CD34+细胞数均与外周血中MNC呈正相关,CD34+细胞百分率与外周血MNC无相关性。结论在分离外周血干/祖细胞方面Fenwal与Amicus没有明显差异。     

ABO血型不合供者外周血造血干细胞的采集

目的研究ABO血型不合供者外周血造血干细胞的采集方法,探讨不去除红细胞和/或血浆进行造血干细胞移植的安全性。方法 29例异基因外周血干细胞移植供者与受者HLA配型为全相合或1～3位点不合,其中ABO主要不合13例,次要不合7例,ABO血型相合9例。采用CS-3000Plus血细胞分离机的干细胞采集程序对ABO血型不合供者的外周血造血干细胞进行采集,不去除红细胞和/或血浆,直接回输给受者。结果 ABO血型主要不合、次要不合及血型相合的供者每次采集的外周血干细胞(PBSC)产品终体积为(59.11±1.19)ml,单个核细胞(MNC)采集物、MNC比例、CD34+细胞、RBC含量三组间的差异无统计学意义。结论应用CS-3000Plus血细胞分离机采集ABO血型不合供者外周血造血干细胞,不仅对供者安全,而且采集产品中造血干细胞浓度较高,血型不合的红细胞污染较少,不需要去除红细胞和血浆,可安全地用于ABO血型不合的受者。     

Improved collection of mobilized CD34+ hematopoietic progenitor cells by a novel automated leukapheresis system

BACKGROUND: For simplification of blood cell transplantation, an automated apheresis system that exploits a dual-stage channel device for mononuclear cell (MNC) collection (Au-toPBSC, designed for the COBE Spectra) was studied. STUDY DESIGN AND METHODS: The automated default software (AutoPBSC-Default) and three software modifications of the harvest frequency during leukapheresis, referred to as Au-toPBSC-1.25, AutoPBSC-1.75, and AutoPBSC-2.75, were evaluated in comparison with the semiautomated Version 4.7 (V4.7) apheresis system in 119 leukapheresis procedures performed in 90 cancer patients treated with chemotherapy plus granulocyte–colony-stimulating factor. CD34+ cell and platelet collection efficiency (CE); volume and cell composition of the leukapheresis components; and patient platelet and red cell (RBC) loss during leukapheresis were measured. RESULTS: The majority of collection measures evaluated with the AutoPBSC compared favorably to those obtained with the V4.7. CD34+ cell CE increased from 55 percent with V4.7 to 68 percent with the AutoPBSC-Default (p = 0.05). The AutoPBSC provided lower platelet contamination in the collected component (1.18 × 10¹¹ vs. 2.26 × 10′′ with the V4.7;p< 0.001). The volume of the AutoPBSC-Default component was significantly lower (67 vs. 180 mL with the V4.7; p<0.001). The MNC purity of the AutoPBSC component was greater (52 vs. 28% with the V4.7; p<0.001), and the RBC contamination lower (AutoPBSC, 0.53 × 10¹¹ vs. 1.04 × 10¹¹ with the V4.7; p<0.001). Modifications of the AutoPBSC to increase the harvest frequency by 1.25-, 1.75-, and 2.75-fold resulted in increased CD34+ cell CE (77%, 75%, and 83%, respectively; p<0.001 in all cases), but also in reduced numbers of circulating platelets, higher platelet contamination of the component, and lower MNC purity than were seen with the AutoPBSC-Default. CONCLUSION: The AutoPBSC offers the following advantages over the V4.7 system: a) better CE of CD34+ cells; b) reduced collection of platelets; c) reduced contamination of the leukapheresis component with granulocytes, platelets, and RBCs; d) reduced component volume; and e) automation.     

A comparative study of a new, fully automated procedure and the standard mononuclear cell program using the Cobe Spectra for peripheral blood stem cell collection.

Recently, a completely automated procedure, the AutoPBSC program for the COBE Spectra cell separator, has been developed for peripheral blood stem cell harvest (PBSCH). We compared the performance of the AutoPBSC program with the standard mononuclear cell (MNC) program in the same patients and in a donor. Peripheral blood stem cells (PBSC) were collected from 3 patients or a donor alternately using the MNC program and the AutoPBSC program in a course of PBSC mobilization. Equal blood volume was processed from each patient (200 ml/kg) and a donor (150 ml/kg). We used a harvest volume of 3 ml and a chase volume of 7 ml in all AutoPBSC procedures. The procedure duration was almost equivalent for both programs. The volume of products was significantly lower in the AutoPBSC program (71 +/- 13 ml) than in the MNC program (183 +/- 30 ml). MNC yields were fewer, and total nucleated cell (TNC) and MNC collection efficiency was less for the AutoPBSC program compared to the MNC program. The CD34+ cell collection efficiency was less for the AutoPBSC program (26.5 +/- 13.7%, compared with 77.7 +/- 60.6%; p > 0.05). The contamination of platelets and red cells was significantly less in the AutoPBSC program than in the MNC program. In conclusion, we consider that the collection efficiency in the new program should be improved by modification of parameters because there exist great advantages to automated procedures.     

Comparison of two mononuclear cell program settings on two apheresis devices intended to collect high yields of CD14+ and CD3+ cells

BACKGROUND: In cancer and transplantation therapy apheresis devices and software of optimum standards are required for the collection of high cell yields with high purity of the desired cell fraction. STUDY DESIGN AND METHODS: In a paired study, 15 healthy blood donors underwent four 10-L leukapheresis procedures (197 +/- 33 min) with an inlet blood flow rate of 60 mL per minute by use of two different MNC program settings of the COBE Spectra (Gambro BCT) and the AS.TEC 204 (Fresenius Hemocare) cell separators. RESULTS: Use of the standard MNC program of both apheresis devices resulted in significantly higher (p < 0.01) collection efficiencies of CD14+ monocytes, CD3+ cells, CD4+ cells, CD8+ T cells, CD16+ CD56+ natural killer (NK) cells, and residual PLTs (p < 0.001), owing to higher centrifuge speed. The mean MNC purity of all components was more than 90 percent. By use of standard programs of either device, significant correlations (p < 0.01) between donor monocytes and preleukapheresis NK cell counts and the corresponding component cell yields were found. CONCLUSION: Compared to the program modifications with lower centrifuge velocities the standard MNC programs were significantly more efficient regarding CD14+, CD3+, and CD16+ CD56+ cells. Enhanced centrifuge speed and inlet blood flow rate in MNC programs resulted in higher, similar composed MNC concentrations of the products.     

Evaluation of the COM.TEC cell separator in predicting the yield of harvested CD34+ cells

BACKGROUND: This multicenter study was performed with the intention to evaluate the exactness of the predicted CD34+ cell yield calculated by two leukapheresis programs of the cell separator COM.TEC upon the number of donor's circulating CD34+ cells and the blood volume processed. STUDY DESIGN AND METHODS: Patients and healthy donors (n = 166) received mobilization by chemotherapy and/or granulocyte colony-stimulating factor and underwent CD34+ cell harvest by the leukapheresis programs MNC or RV-PBSC (n = 203). RESULTS: CD34+ cells were collected by 112 harvests on MNC and by 91 collections on RV-PBSC. The median collection efficiency of CD34+ cells was significantly better for the program MNC than for RV-PBSC (p < 0.001): 67% (31-109) vs. 42% (19-100). The collected CD34+ cell yield was in median more exactly by MNC than by RV-PBSC (p < 0.001): 85% (31-176) vs. 59% (22-110) of the predicted value. Concentrates obtained by RV-PBSC showed in median significantly higher percentages of mononuclear cells (p < 0.001) and CD34+ cells (p < 0.001), 86% (43-99) vs. 56% (25-95) and 1.2% (0.2-14.3) vs. 0.4% (0.1-6.0), and had lower contaminations by erythrocytes (p < 0.001) and platelets (p < 0.001), 13 mL (4-48) vs. 25 mL (5-60) and 1.9 x 1011 vs. 3.1 x 1011, than those harvested by MNC. CONCLUSION: The significantly better collection efficiency of CD34+ cells and the more exact prediction of the harvested CD34+ cell yield make the leukapheresis program MNC a safe and efficient procedure. However, concentrates collected by RV-PBSC are of a better cellular quality with a significantly higher percentage of mononuclear and CD34+ cells and a lower contamination by erythrocytes and platelets.     

Mononuclear cell variability and recruitment in non-cytokine-stimulated donors after serial 10-liter leukapheresis procedures

BACKGROUND: We introduced monitoring of mononuclear cell (MNC) counts to obtain enhanced donor control and a stable quality of MNC products, because there are limited data available about blood donors after serial leukapheresis (LP) procedures. STUDY DESIGN AND METHODS: In a prospective paired study, 13 male healthy blood donors underwent 10-L LP procedures performed on two apheresis devices by use of two MNC program settings (COBE Spectra, Gambro BCT, SF 250 vs. SF 500; and AS.TEC 204, Fresenius Hemocare, CP 129 vs. CP 194). Donors' pre- and postdonation MNC counts were analyzed by fluorescence-activated cell sorting. RESULTS: After each 10-L LP procedure, a transient decline (p < 0.05) of CD14+ monocyte and platelet counts appeared in donors. Loss of donors' CD3+ T cells, CD19+ B cells, and CD16+56+ natural killer (NK) cells during MNC collection was partly compensated by cell recruitment. The MNC recruitment factor (RF) seems to be higher with high-yield MNC program settings. Negative correlations (p < 0.01) were noticed between predonation counts and RFs of CD3+ T cells and CD16+56+ NK cells. Four serial 10-L LP procedures did not result in long lasting MNC depletion for donors. CONCLUSION: MNC recruitment seems to depend on MNC program settings and collected cell yields. Low MNC counts could result in high cell recruitment that may contribute to stable collection results to some degree. Nevertheless, there seems to be a considerable individual variation of MNC recruitment in donors that should be investigated in more detail.     

Enhanced HPC recruitment in children using LVL and a new automated apheresis system

BACKGROUND: A new automated apheresis system has recently been reported as useful in improving peripheral blood HPC collection in adults. The aim of this study has been to verify the utility of this system (AutoPBSC, COBE BCT) for standard leukapheresis and for LVL in the pediatric setting. STUDY DESIGN AND METHODS: A prospective study was set up in 29 leukapheresis procedures carried out in 26 children with malignant diseases and body weight under 40 kg who had undergone mobilization with G-CSF or with G-CSF and chemotherapy. Leukapheresis procedures were performed under two protocols, depending on the total blood volume processed: standard leukapheresis (< or=3) and LVL (>3). The need to prime the tubing set with blood was determined, and the inlet flow rate, collection time, recruitment of CD34+ cells, CD34+ cell collection efficiency, component volume, leukapheresis cell composition, and preapheresis and postapheresis peripheral blood counts were measured. Paired t test, Spearman's correlation coefficient, and the Mann-Whitney U test were employed for statistical analysis. RESULTS: Because of the low extracorporeal volume (167 mL) of the tubing set of the automated blood processor, priming was necessary in only 2 of 26 patients, both weighing under 10 kg. LVL showed better CD34+ cell yield (7.5 vs. 2.3 x 10(6)/kg; p = 0.047), higher recruitment (2.1 vs. 0.9; p = 0.002), and greater collection efficiency (50% vs. 33%; p = 0.005) than standard leukapheresis. No significant differences were found between groups in collection time. In LVL procedures, CD34+ cell collection efficiency and recruitment were not significantly influenced by the inlet flow rate. CONCLUSION: The AutoPBSC is a reliable system for peripheral blood HPC collection in children mainly when used in combination with LVL. The major advantage of this software is a reduced need for priming. LVL allows better CD34+ cell collection efficiency, enhanced recruitment, and improved CD34+ cell yield.     

Continuous Mononuclear Cell Collection (cMNC) protocol impact on hematopoietic stem cell collections in donors with negative collection predictors

Background

Recently, novel protocol utilizing Continuous Mononuclear Cell Collection (cMNC) have been introduced for leukapheresis. We compared the efficacy of cMNC with an older protocol – mononuclear cell collection (MNC) for CD34+ cell collection in unrelated donors with negative stem cell collection predictors.

Collection of peripheral blood progenitor cells with an automated leukapheresis system

BACKGROUND: Apheresis devices designed for the collection of mature blood elements are being used for the collection of peripheral blood progenitor cells (PBPCs).The collection of PBPCs differs from that of other cells in the rarity of the target cell and in the fact that donors may undergo several days of collection. A consequence of this process may be a depletion of blood cells such as platelets from the blood. The disposable set and operating software for an apheresis device (Spectra, COBE BCT) was modified by the manufacturer to automate the collection of PBPCs and reduce the collection of unwanted blood cells. STUDY DESIGN AND METHODS: A study was initiated to compare the collection of PBPCs with the new device, the AutoPBSC (version [V]6.0 with AutoPBSC tubing set), and that with the MNC (mononuclear cell) procedure (V4.7 with white cell tubing set), for patients and healthy donors. RESULTS: Patients whose blood was processed by either theV6.0 orV4.7 procedure achieved the target dose of 5 x 10(6) CD34+ cells per kg of patient weight in similar numbers of procedures, even though the calculated collection efficiency for CD34+ cells using the automated V6.0 procedure was significantly less than that with the V4.7 procedure for both allogeneic donors and patients donating PBPCs. The collection efficiency for platelets was lower with the V6.0 procedure, and components collected in this manner contained fewer platelets. Apheresis by the V6.0 procedure required 30 to 60 more minutes per procedure than apheresis by the V4.7 procedure. Review of engraftment kinetics after transplantation did not reveal any effect of the collection procedure on recipients of either allogeneic or autologous transplants. CONCLUSION: The collection efficiencies of the V6.0 procedure for both CD34+ cells and mature blood cells are lower than those of the V4.7 procedure.The lower collection efficiency for platelets results in a smaller drop in peripheral blood platelet count after the procedure.The automated features of the V6.0 procedure may simplify PBPC collection, but this procedure requires a longer apheresis.     

Comparison of two leukapheresis programs for computerized collection of blood progenitor cells on a new cell separator

BACKGROUND: Peripheral blood progenitor cells (PBPCs) can be collected on various cell separators. Two leukapheresis programs (LP-MNC and LP-PBSC-Lym) were evaluated for computerized collection of PBPCs on a new cell separator. STUDY DESIGN AND METHODS: Leukapheresis assisted by the LP-MNC or LP-PBSC-Lym software was performed for the harvesting of PBPCs in 52 oncology patients after chemotherapy plus G-CSF treatment and in 18 healthy subjects after G-CSF mobilization alone. RESULTS: A total of 38 components from 33 donors via LP-MNC and 43 components from 37 donors via LP-PBSC-Lym were collected with a median of one (range, one to two) standard-volume leukapheresis procedures (9.2-13.3 L) per donor. There were no significant differences between the two groups concerning median counts of WBCs, CD34+ cells, CD34+ cell yields per harvest, and CD34+ cell yields of cumulative harvests. The blood cell counts after leukapheresis revealed that the LP-MNC resulted in significantly higher platelet loss than LP-PBSC-Lym (p = 0.024): 35.9 percent (range, 19.2%-66.1%) versus 29.7 percent (11.6%-52.3%). Regarding the CD34+ cell collection efficiency, the LP-MNC program was significantly better than the LP-PBSC-Lym program (p < 0.001): 77.5 percent (range, 35.5%-98.9%) versus 58.3 percent (range, 20.4%-98.9%). However, concentrates collected by the LP-PBSC-Lym program had significantly higher percentages of MNCs (p < 0.001) and CD34+ cells (p = 0.028) than harvests with the LP-MNC program: 90 percent (range, 69%-99%) versus 70 percent (range, 35%-98%) and 1.2 percent (range, 0.2%-7.3%) versus 0.7 percent (range, 0.2%-6.0%), respectively. No leukapheresis-related serious adverse events were seen, and time for hematopoietic engraftment was equivalent to data published in the literature. CONCLUSION: The LP-MNC program shows a significantly better CD34+ cell collection efficiency than the LP-PBSC-Lym program. However, collections with the LP-MNC program result in PBPC components with a lower MNC and CD34+ cell concentrations and a higher apheresis-related loss of patient's platelets.