Journal of Hematology and Transfusion

A Combination of Pegfilgrastim and Filgrastim has No Benefit compared to Filgrastim alone for autologous Stem Cell Mobilization

Research Article | Open Access

  • 1. Division of Hematology and Oncology, Medizinische Klinik und Poliklinik IV, Klinikum der Universität München, Germany
  • 2. Division of Endocrinology and Diabetology, Medizinische Klinik und Poliklinik IV, Klinikum der Universität München, Germany
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Corresponding Authors
Fuat S. Oduncu, Head of Division of Hematology and Oncology, Medizinische Klinik und Poliklinik IV, Klinikum der Universität München, Ziemssenstrasse 1, D-80336, Munich, Germany, Tel: 49 89 5160 2205 Fax: 49 89 5160 4412

Background: Autologous stem cell transplantation is an established therapy for various hematological malignancies. A precondition is the efficient and save mobilization of blood stem cells, which is achieved by treatment with granulocyte colony stimulating factors. Previously, it has been demonstrated that the pegylated form of filgrastim, pegfilgrastim, is comparable to filgrastim in the efficiency of stem cell mobilization. Here, we examine, whether a combination of pegfilgrastim and filgrastim exerts a benefit compared to filgrastim alone in safety and efficiency of autologous stem cell mobilization.

Patients and methods: We retrospectively analyzed the data of 131 patients undergoing stem cell mobilization for autologous stem cell transplantation. The patients received filgrastim (n = 66) or pegfilgrastim and filgrastim (n = 65) for stem cell mobilization.

Results: Infection rate, fever of unknown origin and stem cell harvest were similar in both groups. After autologous stem cell transplantation, time to neutrophil recovery was equal in both groups.

Conclusion: Combination of filgrastim and pegfilgrastim is not superior in efficiency and safety of blood stem mobilization in unselected patients.


Then C, Schnabel B, Völkl A, Baumann P, Schmidmaier R, et al. (2014) A Combination of Pegfilgrastim and Filgrastim has No Benefit compared to Filgrastim alone for autologous Stem Cell Mobilization. J Hematol Transfus 2(1): 1012.


•    Multiple myeloma
•    Autologous stem cell mobilization
•    Autologous stem cell transplantation
•    ASCT
•    Filgrastim
•    Pegfilgrastim
•    Neupogen
•    Neulasta


Autologous stem cell transplantation (ASCT) improves the prognosis of various hematological malignancies, and tandem or multiple ASCT have become recognized treatment options [1]. Especially if two or more ASCT are planned, the efficient mobilization of autologous peripheral blood stem cells is mandatory. Stem cell mobilization is usually enabled by a conditioning chemotherapy regimen and subsequent stem cell growth stimulation with granulocyte colony-stimulating factor (G-CSF). The most widely used G-CSF preparation is filgrastim, a non-glycosylated recombinant human G-CSF. The half-life of filgrastim is four hours, requiring at least daily applications [2].

Pegfilgrastim is a pegylated form of filgrastim and contains a 20-kd polyethylene glycol molecule linked to the N terminus causing a greater physical and thermal stability, resistance to enzymatic degradation by masking of proteolytic cleavage sites and a decreased renal clearance [3, 4]. Thus, pegfilgrastim clearance is mainly dependent on binding to G-CSF receptors on neutrophils, subsequent cellular uptake, intracellular degrading and cleavage by neutrophil elastase [5]. During neutropenia, this mechanism is quickly saturated and a single injection of pegfilgrastim at a dose of 6 mg is sufficient to maintain high plasma concentrations for over 14 days [6].

Of late, pegfilgrastim is increasingly used for stem cell mobilization. The continuous stimulation might result in a better mobilization effect compared to the pulsatile stimulation evoked by filgrastim: After pegfilgrastim treatment, the median CD34+ cell count is higher on day 4 [7], and in some studies, pegfilgrastim is slightly superior to filgrastim regarding the time to white blood cell recovery and to the first apheresis procedure [8-10] and the median number of CD34+ cells collected at first apheresis [11]. However, data comparing mobilization therapies using filgrastim or pegfilgrastim are sparse and mobilization regimens combining the two agents have scarcely been studied to date. We here examined, whether the addition of filgrastim to pegfilgrastim may help to provide a more sustained CD34+ mobilization and thereby a more efficient stem cell harvest.



We retrospectively analyzed the data of 131 consecutive patients undergoing peripheral blood stem cell mobilization from 2008 until 2012 at the Clinic and Policlinic IV, Ludwig Maximilians-Universität München, Munich. Patients suffered mainly from multiple myeloma and non-Hodgkin´s lymphoma, but also patients with Hodgkin´s disease, acute myeloid leukemia, sarcoma and neuroblastoma were included.

Mobilization therapy and G-CSF treatment

Patients received mobilizing cytostatic chemotherapy according to standard practice. Mobilization chemotherapies comprised cyclophosphamide (3.0 g/m2 ), IEV (ifosfamid, epirubicin, vepesid), bortezomib/dexamethasone or other chemotherapy regimens as indicated in Table 1. In patients not receiving pegfilgrastim, filgrastim was started on day 5 (5 µg/kg/d) and continued until the last day of leukapheresis. Pegfilgrastim at a dose of 6 mg was injected subcutaneously on day 5. Filgrastim (5 µg/kg/d) [12] was started in patients having received pegfilgrastim two days before the anticipated onset of the leukapheresis (day 10) and was continued until the end of the leukapheresis. After the end of the chemotherapy or after the administration of pegfilgrastim, respectively, patients were discharged from the hospital. Standardized supportive care included oral ciprofloxacin, oral amphotericin B, and transfusions to maintain a hemoglobin above 80 g/L and platelets above 10000/µl. Piperacillin/tazobactam was started empirically during neutropenia after a single oral temperature > 38.5 °C or when fever > 38.0 °C was present over at least one hour [13].

Stem cell collection

Patients were readmitted to hospital on day 9 after mobilization chemotherapy. Daily measurements of blood CD34+ cells were initiated after recovery of the leukocyte count to a level of 109 /L. CD34+ cell count was determined by flow cytometry with a FacsCanto flow cytometer (Becton-Dickinson, San Jose, CA, USA) using TrueCountTM tubes and ProcountTM reagents. Apheresis was initiated when the CD34+ count reached ≥ 10 cells/µl. Apheresis was performed using a Cobe Spectra apheresis system (Caridian BCT, CO, USA). For one ASCT, the target yield was 2 × 106 CD34+ cells/kg. In all patients, we aimed to collect sufficient stem cells for at least two transplantations (≥ 4 × 106 /kg). In case of failure to achieve the intended CD34+ target yield, a second mobilization therapy with filgrastim, filgrastim plus pegfilgrastim or filgrastim plus AMD3100 (Plerixafor®) was performed. The apheresis product containing 10% dimethyl sulfoxide was frozen using the computer-controlled device Kryo 560-16, Planer, Sunbury, Middlesex, UK, and stored in the vapor phase of liquid nitrogen at -140°C.

High-dose chemotherapy and ASCT

High-dose chemotherapy was administered according to the malignancies as indicated in Table 4. Myeloma patients received melphalan at a dose of 140 or 200 mg as described previously [14], whereas lymphoma patients mainly received BEAM (carmustine, etoposide cytarabine, melphalan). Of the patient group having received pegfilgrastim combined with filgrastim, 82% underwent at least one ASCT. Of the patient group treated with filgrastim only, 68% were transplanted until data collection. Reasons to refrain from ASCT were progressive disease or death. Following stem cell infusion, G-CSF was applied until the neutrophil count rose above 109 /L.

Statistical analysis

For statistical analyses we used the SPSS software (IBM Deutschland GmbH, Ehningen, Germany). Clinical characteristics, infection rate and stem cell collection outcomes were compared between the patient group receiving filgrastim plus pegfilgrastim and the patient group receiving filgrastim using the Mann-and Whitney-U-test. The level of statistical significance was set at 5%.

Table 1: Characteristics of 131 patients undergoing stem cell mobilization.

  Pegfilgrastim and 
filgrastim (n = 65) 
(n = 66)
Male gender 36 (55%) 39 (59%) 0.669
Age at leukapheresis, median (range) 63 (24-74) 64 (25-75) 0.068
Body weight in kg, median (range) 74 (45-117) 75 (44-120) 0.219
Previous chemotherapy cycles before mobilization, median number (range) 4 (0-20) 3 (0-14) 0.417
Previous irradiation before mobilization 20 (30%) 15 (23%) 0.300
Multiple Myeloma 35 (54%) 43 (65%)  
Multiple Myeloma and Amyloidosis 2 (3%) 4 (6%)  
Non-Hodgkin Lymphoma 15 (23%) 13 (20%)  
Hodgkin Disease 5 (8%) 3 (4.5%)  
Acute Myeloid Leukaemia 6 (9%) 3 (4.5%)  
Sarcoma or Neuroblastoma 2 (3%) 0 (0%)  
Mobilization chemotherapy regimens
IEV (ifosfamid, epirubicin, vepesid) 14 (21%) 10 (15%)  
Cyclophosphamid (3 g/m2) 35 (54%) 24 (36%)  
Bortezomib/dexamethason 0 (0%) 8 (12%)  
Other chemotherapy regimens 13 (20%) 13 (20%)  



Patient characteristics

Clinical characteristics of 131 patients included in the analysis are listed in Table 1. No significant differences were detected in gender, age, body weight, number of chemotherapy cycles and irradiations preceding the conditioning chemotherapy for stem cell mobilization. Filgrastim was applied in patients having received pegfilgrastim two days before the anticipated leukapheresis initiation and was continued until the end of the leukapheresis, resulting in a median filgrastim application time of four days (mean 4.5 ± 2.7 days). Median duration of filgrastim therapy was 10 days in the filgrastim group (mean 10.1 ± 3.1 days).

Infection rate

No significant differences were detected in the infection rate in the patient group receiving pegfilgrastim in combination with filgrastim compared to patients receiving only filgrastim. Proportions of patients with neutropenic fever and the median number of days with fever were similar in both study groups. In the patient group receiving filgrastim only, the number of documented bacterial infections was non-significantly higher than in the patient group receiving pegfilgrastim plus filgrastim (15 vs. 8) (Table 2).

Stem cell harvest and outcome after ASCT

Of 131 patients undergoing stem cell mobilization, 122 achieved the CD34+ target yield after the first mobilization therapy. Nine patients (four patients in the pegfilgrastim plus filgrastim group, five patients in the filgrastim group) failed to collect the intended CD34+ number. Of these poor mobilizers, five underwent a second mobilization with filgrastim stimulation, one with filgrastim plus pegfilgrastim and three with filgrastim and AMD3100. A sufficient stem cell number was finally collected in all patients.

Patients treated with pegfilgrastim and filgrastim collected a total median amount of 8.8 × 106 CD34+ cells/kg (range 1.3- 31.5) and patients in the filgrastim group had a median CD34+ cell count of 6.6 × 106 /kg (range 0.5-50.5), which was not significantly different. There was also no significant difference in the CD34+ yield per apheresis session or the number of apheresis cycles required (Table 3). It has been shown previously that the final CD34+ cell yield, the mean number of apheresis sessions and the peak concentration of neutrophils in lymphoproliferative malignancies are not superior after pegfilgrastim as compared to filgrastim treatment [7,10,15,16]. A reason might be that the median CD34+ count 10 days after chemotherapy and the CD34+ peak tend to be lower after pegfilgrastim treatment [9,15,17], which is probably due to the context-sensitive half live of pegfilgrastim. Once G-CSF receptor-expressing cells are present, pegfilgrastim is cleared from the plasma, resulting in declining levels during neutrophil recovery. A post-nadir absolute neutrophil count of > 109 /L is a threshold for the clearance to sub-therapeutic levels [18]. Especially in cases of early neutrophil recovery, pegfilgrastim may be cleared before sufficient CD34+ cells are stimulated. A reason for the failure of additional filgrastim to induce a stronger stem cell mobilization after partial recovery of neutrophils in our study may be an accumulation of injected G-CSF and endogenous cytokines, rendering additional G-CSF superfluous. In one previous study, addition of filgrastim to pegfilgrastim was performed in poor mobilizers (mainly heavily pretreated patients), resulting in a sufficient CD34+ yield in some of these patients. However, a control group was not available [19]. Enhancement of stem cell mobilization by cytokines targeting different pathways of stem cell mobilization may be more efficient, since addition of the CXCR-4 antagonist AMD3100 to G-CSF resulted in an increase in mobilization of CD34+ cells in previous studies [20,21].

The amounts of transplanted stem cells were 2.9 and 2.5 × 106 CD34+ cells/kg in the pegfilgrastim/filgrastim and the filgrastim group, respectively. However, not only the number of transplanted stem cells is decisive, but also their functionality. Pegfilgrastim-mobilized autologous stem cells may have different biological properties than filgrastim-mobilized cells, including altered cell cycle kinetics and different CD34+ subset composition. The more continuous G-CSF stimulation might lead to the stimulation of less mature hematopoietic progenitor cells [10,22]. However, in line with previous data [23], we found no difference in the time to neutrophil recovery after ASCT in the study group receiving pegfilgrastim plus filgrastim compared to patients treated with filgrastim. The median time to neutrophil recovery after transplantation was 10 days in both groups after the first and the second ASCT (Table 4).

Table 2: Infection rate.

  Pegfilgrastim and 
filgrastim (n = 65)
Filgrastim (n 
= 66) 
Fever > 38.0°C 14 (22%) 16 (24%) 0.714
Days with fever > 38.0°C, median (range) 2 (1-4) 2 (1-12) 0.559
Infection rate 8 (12%) 13 (20%) 0.251
Fever of unknown origin 7 (11%) 7 (11%) 0.874
Documented infections a
Bacterial 8 15  
Viral 2 1  
Mycotic 0 1  
Infection localizations      
Pneumonia 2 6  
Sepsis 2 3  
Urinary tract 1 2  
Upper respiratory tract 1 0  
Jaw area 0 1  
Herpes genitalis 1 0  
Herpes zoster 0 1  
Haemorrhoidal 1 0  
Perianal abscess 0 1  
Colitis 0 3  
Proctitis 1 0  

a given is the number of documented infections in each patient group. Some patients experienced more than one infection

Table 3: Autologous stem cell harvest.

and filgrastim (n 
= 65)a
Filgrastim (n 
= 66)b
Median leukapheresis number (range) 1 (1-4) 1 (1-3) 0.661
Total amount of harvest CD34+ cells, median number × 106/kg (range) 8.8 (1.3-31.5) 6.6 (0.5-50.5) 0.073
CD34+ cells per leukapheresis, median number × 106/kg (range) 5.8 (0.7-31.5) 4.4 (0.5-50.5) 0.248

a four and b five patients, respectively, failed to collect the intended CD34+ yield and underwent a second mobilization therapy

Table 4: Autologous stem cell transplantation: Conditioning regimes, amount of transplanted stem cells and hematopoietic recovery.

  Pegfilgrastim and 
filgrastim (n = 65)
Filgrastim (n 
= 66)
First ASCT/second ASCT
Number of transplanted patients 54/18 45/30  
Transplanted CD34+ cells, median number × 106/kg (range) 2.9 (2.0-10.5)/ 3.0 (2.0-10.5) 2.5 (2.0- 11.4)/ 2.7 (2.0-11.4) 0.207/ 0.477
Days to neutrophil recovery, median (range)a 10 (8-13)/ 10 (8-12) 10 (8-13)/ 10 (9-13) 0.867/0.812
High-dose chemotherapy regimen, n
Melphalan 140 mg/m2 23 (43 %)/12 (67 %) 27 (60 %)/21 (68 %)  
Melphalan 200 mg/m2 11 (20 %)/6 (33 %) 8 (18 %)/9 (32 %)  
BEAM (carmustine, etoposide, cytarabine, melphalan) 16 (30 %) 8 (18 %)  
Busulfan/Cyclophosphamid 3 (5 %) 1 (2 %)  
other 1 (2 %) 1 (2 %)  

a defined as an absolute neutrophil count > 500/µl


The current study demonstrates that a combination of pegfilgrastim and filgrastim does not result in a higher stem cell yield and thus disproves our hypothesis that the addition of filgrastim in the early phase of leukocyte recovery might help to increase stem cell mobilization. The data suggest that there is currently no rationale to combine pegfilgrastim and filgrastim for autologous stem cell mobilization in unselected patients. The major limitation of the current study is its retrospective design. Furthermore, our study did not allow examination of patient subgroups, such as heavily pretreated patients and patients with poor mobilization or early neutrophil recovery. Whether a combination of filgrastim and pegfilgrastim may be beneficial in such patients needs to be clarified in further studies.


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2. Roskos LK, Lum P, Lockbaum P, Schwab G, Yang BB. Pharmacokinetic/ pharmacodynamic modeling of pegfilgrastim in healthy subjects. J Clin Pharmacol. 2006; 46: 747-757.

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8. Bruns I, Steidl U, Kronenwett R, Fenk R, Graef T, Rohr UP, et al. A single dose of 6 or 12 mg of pegfilgrastim for peripheral blood progenitor cell mobilization results in similar yields of CD34+ progenitors in patients with multiple myeloma. Transfusion. 2006; 46: 180-185.

9. Fruehauf S, Klaus J, Huesing J, Veldwijk MR, Buss EC, Topaly J, et al. Efficient mobilization of peripheral blood stem cells following CAD chemotherapy and a single dose of pegylated G-CSF in patients with multiple myeloma. Bone Marrow Transplant. 2007; 39: 743-750.

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16. Simona B, Cristina R, Luca N, Sara S, Aleksandra B, Paola B, et al. A single dose of Pegfilgrastim versus daily Filgrastim to evaluate the mobilization and the engraftment of autologous peripheral hematopoietic progenitors in malignant lymphoma patients candidate for high-dose chemotherapy. Transfus Apher Sci. 2010; 43: 321-326.

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22. Bruns I, Steidl U, Fischer JC, Czibere A, Kobbe G, Raschke S, et al. Pegylated granulocyte colony-stimulating factor mobilizes CD34+ cells with different stem and progenitor subsets and distinct functional properties in comparison with unconjugated granulocyte colony-stimulating factor. Haematologica. 2008; 93: 347-355.

23. Russell N, Mesters R, Schubert J, Boogaerts M, Johnsen HE, Canizo CD, et al. A phase 2 pilot study of pegfilgrastim and filgrastim for mobilizing peripheral blood progenitor cells in patients with non Hodgkin’s lymphoma receiving chemotherapy. Haematologica. 2008; 93: 405-412.

Received : 12 Nov 2013
Accepted : 14 Nov 2013
Published : 23 Dec 2013
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Annals of Breast Cancer Research
ISSN : 2641-7685
Launched : 2016
Annals of Gerontology and Geriatric Research
ISSN : 2378-9409
Launched : 2014
Journal of Sleep Medicine and Disorders
ISSN : 2379-0822
Launched : 2014
JSM Burns and Trauma
ISSN : 2475-9406
Launched : 2016
Chemical Engineering and Process Techniques
ISSN : 2333-6633
Launched : 2013
Annals of Clinical Cytology and Pathology
ISSN : 2475-9430
Launched : 2014
JSM Allergy and Asthma
ISSN : 2573-1254
Launched : 2016
Journal of Neurological Disorders and Stroke
ISSN : 2334-2307
Launched : 2013
Annals of Sports Medicine and Research
ISSN : 2379-0571
Launched : 2014
JSM Sexual Medicine
ISSN : 2578-3718
Launched : 2016
Annals of Vascular Medicine and Research
ISSN : 2378-9344
Launched : 2014
JSM Biotechnology and Biomedical Engineering
ISSN : 2333-7117
Launched : 2013
JSM Environmental Science and Ecology
ISSN : 2333-7141
Launched : 2013
Journal of Cardiology and Clinical Research
ISSN : 2333-6676
Launched : 2013
JSM Nanotechnology and Nanomedicine
ISSN : 2334-1815
Launched : 2013
Journal of Ear, Nose and Throat Disorders
ISSN : 2475-9473
Launched : 2016
JSM Ophthalmology
ISSN : 2333-6447
Launched : 2013
Journal of Pharmacology and Clinical Toxicology
ISSN : 2333-7079
Launched : 2013
Annals of Psychiatry and Mental Health
ISSN : 2374-0124
Launched : 2013
Medical Journal of Obstetrics and Gynecology
ISSN : 2333-6439
Launched : 2013
Annals of Pediatrics and Child Health
ISSN : 2373-9312
Launched : 2013
JSM Clinical Pharmaceutics
ISSN : 2379-9498
Launched : 2014
JSM Foot and Ankle
ISSN : 2475-9112
Launched : 2016
JSM Alzheimer's Disease and Related Dementia
ISSN : 2378-9565
Launched : 2014
Journal of Addiction Medicine and Therapy
ISSN : 2333-665X
Launched : 2013
Journal of Veterinary Medicine and Research
ISSN : 2378-931X
Launched : 2013
Annals of Public Health and Research
ISSN : 2378-9328
Launched : 2014
Annals of Orthopedics and Rheumatology
ISSN : 2373-9290
Launched : 2013
Journal of Clinical Nephrology and Research
ISSN : 2379-0652
Launched : 2014
Annals of Community Medicine and Practice
ISSN : 2475-9465
Launched : 2014
Annals of Biometrics and Biostatistics
ISSN : 2374-0116
Launched : 2013
JSM Clinical Case Reports
ISSN : 2373-9819
Launched : 2013
Journal of Cancer Biology and Research
ISSN : 2373-9436
Launched : 2013
Journal of Surgery and Transplantation Science
ISSN : 2379-0911
Launched : 2013
Journal of Dermatology and Clinical Research
ISSN : 2373-9371
Launched : 2013
JSM Gastroenterology and Hepatology
ISSN : 2373-9487
Launched : 2013
Annals of Nursing and Practice
ISSN : 2379-9501
Launched : 2014
JSM Dentistry
ISSN : 2333-7133
Launched : 2013
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