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Plesa A, Elhamri M, Clapisson G, Mattei E, Gazzo S, Hequet O, Tigaud I, Michallet M, Dumontet C, Thomas X. Higher percentage of CD34 + CD38- cells detected by multiparameter flow cytometry from leukapheresis products predicts unsustained complete remission in acute myeloid leukemia. Leuk Lymphoma 2014; 56:622-9. [PMID: 24884314 DOI: 10.3109/10428194.2014.927453] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Relapse in acute myeloid leukemia (AML) after chemotherapy reflects the persistence of resistant leukemia stem cells (LSCs). These cells have been described in the CD34 + CD38- cell fraction. Leukapheresis products were harvested in 123 patients in morphological complete remission and analyzed by multiparameter flow cytometry. The CD34 + CD38- cell population showed a prognostic impact on survival. Median event-free survival (EFS) was 8.2 months (3-year EFS: 29%) for those with a higher percentage of CD34 + CD38- versus 91.9 months (3-year EFS: 62%) for those with a lower percentage for the entire cohort. These differences were confirmed in patients undergoing autologous stem cell transplant, with median EFS of 7.3 months versus 91.1 months (3-year EFS: 31% vs. 70%). Higher proportions of CD34 + CD38- cells were associated with adverse cytogenetics and with earlier relapses. Higher percentages of CD34 + CD38- cells in apheresis products reflect inadequate in vivo purging and reliably distinguish samples enriched in LSCs from those involving mainly normal cells.
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Messina C, Candoni A, Carrabba MG, Tresoldi C, Sala E, Tassara M, Crippa A, Peccatori J, Assanelli A, Gattillo S, Bellio L, Fanin R, Ciceri F, Bernardi M. Wilms' tumor gene 1 transcript levels in leukapheresis of peripheral blood hematopoietic cells predict relapse risk in patients autografted for acute myeloid leukemia. Biol Blood Marrow Transplant 2014; 20:1586-91. [PMID: 24954546 DOI: 10.1016/j.bbmt.2014.06.017] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2014] [Accepted: 06/11/2014] [Indexed: 10/25/2022]
Abstract
Autologous hematopoietic stem cell transplantation (ASCT) is a curative option alternative to allogeneic transplantation for patients with acute myeloid leukemia (AML). Relapse after ASCT can be due to contamination with leukemic blasts of autologous peripheral blood stem cells (PBSCs) collected by leukapheresis (LK). Identification and quantification of a minimal residual disease (MRD) marker in PBSCs could be relevant in determining the relapse risk after ASCT. High levels of the WT1 gene transcript in bone marrow of AML patients after treatment completion predict disease relapse. We evaluated WT1 transcript levels in autologous PBSC from LK used for ASCT in 30 consecutive AML patients in complete remission (CR) and established a correlation with clinical outcome. At diagnosis, all patients had WT1 overexpression. All patients were in morphological and genetic CR at the time of PBSC collection and before ASCT. Real-time quantitative PCR of WT1 was performed in samples of each LK, using TaqMan technology on RNA from mononucleated cells. The median WT1 transcript level in the PBSC graft (WT1-LK) of patients who relapsed was significantly higher than of those who did not relapse after transplantation (P <.0001). We defined a cut-off level of 80 WT1-LK copies/ABL 10e4 copies to discriminate between positive and negative PBSC grafts. The cut-off level was strongly associated with disease recurrence, DFS and OS. Our study represents the largest series of patients evaluating WT1 as a marker of MRD in PBSC LK products using a completely standardized real-time WT1-reverse transcriptase-PCR based assay. These data, if confirmed by prospective study, will help to determine an individual patient's adapted postremission allocation strategy.
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Affiliation(s)
- Carlo Messina
- Hematology and Bone Marrow Transplantation Unit, San Raffaele Scientific Institute, Milan, Italy
| | - Anna Candoni
- Division of Hematology and Bone Marrow Transplantation Unit, University Hospital of Udine, Udine, Italy
| | - Matteo G Carrabba
- Hematology and Bone Marrow Transplantation Unit, San Raffaele Scientific Institute, Milan, Italy
| | - Cristina Tresoldi
- Immuno-hematology and Transfusion Medicine, San Raffaele Scientific Institute, Milan, Italy
| | - Elisa Sala
- Hematology and Bone Marrow Transplantation Unit, San Raffaele Scientific Institute, Milan, Italy
| | - Michela Tassara
- Immuno-hematology and Transfusion Medicine, San Raffaele Scientific Institute, Milan, Italy
| | - Alessandra Crippa
- Immuno-hematology and Transfusion Medicine, San Raffaele Scientific Institute, Milan, Italy
| | - Jacopo Peccatori
- Hematology and Bone Marrow Transplantation Unit, San Raffaele Scientific Institute, Milan, Italy
| | - Andrea Assanelli
- Hematology and Bone Marrow Transplantation Unit, San Raffaele Scientific Institute, Milan, Italy
| | - Salvatore Gattillo
- Immuno-hematology and Transfusion Medicine, San Raffaele Scientific Institute, Milan, Italy
| | - Laura Bellio
- Immuno-hematology and Transfusion Medicine, San Raffaele Scientific Institute, Milan, Italy
| | - Renato Fanin
- Division of Hematology and Bone Marrow Transplantation Unit, University Hospital of Udine, Udine, Italy
| | - Fabio Ciceri
- Hematology and Bone Marrow Transplantation Unit, San Raffaele Scientific Institute, Milan, Italy.
| | - Massimo Bernardi
- Hematology and Bone Marrow Transplantation Unit, San Raffaele Scientific Institute, Milan, Italy
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Prognostic significance of flow cytometric residual disease, dysregulated neutrophils/monocytes, and hematogones in adult acute myeloid leukemia in first remission. Int J Hematol 2014; 99:296-304. [PMID: 24481944 DOI: 10.1007/s12185-014-1525-y] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2013] [Revised: 01/15/2014] [Accepted: 01/15/2014] [Indexed: 10/25/2022]
Abstract
Fifty-one consecutive non-M3 acute myeloid leukemia (AML) patients who had achieved morphologic complete remission (mCR) after induction chemotherapy were enrolled in the present study. Three characteristics of bone marrow (BM) composition analyzed by flow cytometry were combined to determine the prognostic impact. A standardized panel of reagents was used to detect residual disease of aberrant myeloid progenitor cells (RD), identify neutrophils/monocytes with dysregulated immunophenotype (dysregulated neutro/mono) and quantify the appearance of CD34(+) B-progenitor-related cluster (hematogones) simultaneously in post-induction BM of adult AML patients. Patients who had detectable RD ≥0.2 % exhibited significantly lower median leukemia-free survival (LFS) than those who did not (13.5 vs. 48.0 months; P = 0.042). Dysregulated neutro/mono abnormalities assessed by this flow cytometric scoring system (FCSS ≥2) predicted shorter LFS (8.0 vs. 39.0 months; P = 0.008). While B-progenitor-related cluster size ≥5 % predicted improved outcome, with longer LFS (not reached vs. 13.5 months; P = 0.023) and better overall survival (not reached vs. 24.0 months; P = 0.027). The proposed RD/dysregulated neutro/mono/hematogones score showed a new risk groups with different LFS in the overall patients (P = 0.0006) as well as in the subgroup of intermediate cytogenetic risk (P = 0.001). The RD/dysregulated neutro/mono/hematogones score assessed by flow cytometry for adult AML in mCR may offer a rapid and practical risk assessment providing better refinement in risk-adapted management after induction chemotherapy.
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Prognostic and therapeutic implications of minimal residual disease at the time of transplantation in acute leukemia. Bone Marrow Transplant 2012; 48:630-41. [PMID: 22825427 DOI: 10.1038/bmt.2012.139] [Citation(s) in RCA: 78] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Relapse remains the major cause of treatment failure after hematopoietic cell transplantation (HCT) in acute leukemia, even in patients transplanted in morphologic CR. Various techniques now enable the sensitive quantification of 'minimal' amounts of residual disease (MRD) in patients with acute leukemia in remission. Numerous studies convincingly demonstrate that MRD at the time of transplantation is a powerful, independent predictor of subsequent relapse, with current detection levels of one leukemic cell in 10(5)-10(6) normal cells being prognostically relevant. This recognition provides the rationale to assign patients with detectable MRD (that is, 'MRD(+)' patients) to intensified therapies before, during, or after transplantation, although data supporting these strategies are still sparse. Limited evidence from observational studies suggests that outcomes with autologous HCT are so poor that MRD(+) patients should preferentially be assigned to allogeneic HCT, which can cure a subgroup of these patients, particularly if unmanipulated (T-cell replete) grafts and/or minimized immunosuppression are used to optimize the graft-vs-leukemia effect. Emerging data suggest that additional therapy with non-cross-resistant agents to decrease residual tumor burden before transplantation in MRD(+) patients might be beneficial. Further, other studies hint at immunotherapy (for example, rapid withdrawal of immunosuppression and/or donor lymphocyte infusions) as a means to prevent overt relapse if patients remain, or become, MRD(+) after HCT. Ultimately, controlled clinical studies are needed to define the value of MRD-directed therapies, and patients should be encouraged to enter such trials.
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CD34+ cell subpopulations detected by 8-color flow cytometry in bone marrow and in peripheral blood stem cell collections: application for MRD detection in leukemia patients. Int J Hematol 2009; 90:292-302. [DOI: 10.1007/s12185-009-0389-z] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2008] [Revised: 07/08/2009] [Accepted: 07/08/2009] [Indexed: 10/20/2022]
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6
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Candoni A, Tiribelli M, Toffoletti E, Cilloni D, Chiarvesio A, Michelutti A, Simeone E, Pipan C, Saglio G, Fanin R. Quantitative assessment of WT1 gene expression after allogeneic stem cell transplantation is a useful tool for monitoring minimal residual disease in acute myeloid leukemia. Eur J Haematol 2008; 82:61-8. [PMID: 18801058 DOI: 10.1111/j.1600-0609.2008.01158.x] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
INTRODUCTION WT1 overexpression is described in several oncological diseases including acute myeloid leukemia (AML). Quantification of WT1 in bone marrow samples may be useful as a marker of minimal residual disease (MRD) and may predict the relapse of AML after allogeneic hematopoietic stem cell transplant (HSCT). METHODS AND RESULTS The quantitative expression of WT1 was measured in 38 AML patients (16 males and 22 females) at diagnosis, at the time of transplant and after the allogeneic HSCT (at precise time points). All cases showed high WT1 expression levels at diagnosis with a mean of 4189 (SD 3325) and a median of 3495 (range 454-13923) copies WT1/10(4)Abl. At transplant, 25 patients (66%) were in complete cytologic remission (CcR) and 13 (34%) had refractory or relapsed AML. Bone marrow samples from patients transplanted in CcR showed significantly lower WT1 expression levels during HSCT compared with the samples from patients with a relapsed or refractory AML (P = 0.004). After HSCT, a rapid decline in WT1 expression levels was observed in all patients who attained or maintained a condition of CcR. Six of 38 patients (13%) relapsed after HSCT and all of them had an increase in WT1 expression at/or before relapse. Five of these six patients died of leukemia and one was successfully reinduced with donor lymphocyte infusion (DLI) + chemotherapy with a rapid reduction of WT1 levels. Besides, we found a complete concordance between WT1 expression levels and other disease markers (when available). CONCLUSIONS In our experience, there was a complete concordance between WT1 expression levels (measured by quantitative RT-PCR at precise time points) and status of AML before and after allogeneic HSCT. WT1 may be useful as a non-specific leukemia marker for monitoring MRD and as a predictor of AML clinical relapse. Based on these results, cases with increase of WT1 levels after HSCT and without graft vs. host disease may be candidate to discontinuation of immunosuppression and/or DLI therapy.
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Affiliation(s)
- Anna Candoni
- Division of Hematology and Bone Marrow Transplantation, Department of Medical and Morphologic Research, University of Udine, Udine, Italy.
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Strodtbeck D, Bornhäuser M, Hänel M, Lerche L, Schaich M, Illmer T, Thiede C, Geissler G, Herbst R, Ehninger G, Platzbecker U. Graft clonogenicity and intensity of pre-treatment: factors affecting outcome of autologous peripheral hematopoietic cell transplantation in patients with acute myeloid leukemia in first remission. Bone Marrow Transplant 2006; 36:1083-8. [PMID: 16247435 DOI: 10.1038/sj.bmt.1705176] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
A total of 22 patients with acute myeloid leukemia (AML) in first complete remission receiving autologous blood stem cell transplantation (ABSCT) were investigated in order to determine factors affecting outcome. All but two patients had a normal karyotype and received the same high-dose chemotherapy followed by G-CSF-mobilized peripheral blood stem cells after the second (n=5) or third (n=17) course of induction and post-remission chemotherapy, respectively. With a median follow-up of 30 months, the median disease-free survival is 24.1 months. Univariate analysis showed that three chemotherapy cycles before ABSCT were associated with a significant better disease-free survival (P=0.0018) and overall survival (P=0.0033), whereas the presence of an FLT3-mutation (n=6) showed no impact. The number of megakaryocytic progenitors (CFU-MK) infused tended to correlate with primary platelet engraftment (P=0.07) and were predictive for neutrophil (P=0.011) and platelet counts (P=0.009) 180 days after transplantation. Patients receiving a higher amount of CFU-MK had a better event-free survival (P=0.02). Our data suggest that the content of CFU-MK within the graft predicts the quality of hematological recovery and long-term disease control. Additionally, a minimum of three chemotherapy cycles before ABSCT seems to be associated with an improved outcome.
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Affiliation(s)
- D Strodtbeck
- Medizinische Klinik und Poliklinik I, Universitätsklinikum 'Carl Gustav Carus', Dresden, Germany
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8
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Osborne D, Frost L, Tobal K, Liu Yin JA. Elevated levels of WT1 transcripts in bone marrow harvests are associated with a high relapse risk in patients autografted for acute myeloid leukaemia. Bone Marrow Transplant 2005; 36:67-70. [PMID: 15908982 DOI: 10.1038/sj.bmt.1704992] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Relapse postautograft in acute myeloid leukaemia (AML), may in part arise from leukaemia cells present in the bone marrow (BM) inoculum, and the level of minimal residual disease (MRD) in BM harvests used for autografting may therefore be clinically important. We have used the WT1 transcript as a marker of MRD, which was quantitated by RQ-PCR, in the BM harvests of 24 patients receiving an ABMT for AML. ABL was used as a control gene with WT1 level being normalised to 10(5) copies of ABL per sample. Median WT1 level was 651 copies (range=113-32 700) for the 13 patients with relapse-free survival (RFS) of less than 5 years, and 174 (range=0-1900) for patients with RFS of over 5 years postautograft (P<0.04). The RFS was 10.5 months for patients with WT1 level of >2000 copies (n=5), and has not yet been reached for patients with WT1 level<2000 (n=21), at a median follow-up of 92 months (P<0.05). We show that elevated levels of MRD in BM harvests are associated with a higher relapse risk in patients autografted for AML.
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Affiliation(s)
- D Osborne
- University Department of Haematology, Manchester Royal Infirmary, Manchester, UK
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9
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Feller N, Jansen-van der Weide MC, van der Pol MA, Westra GAH, Ossenkoppele GJ, Schuurhuis GJ. Purging of peripheral blood stem cell transplants in AML: a predictive model based on minimal residual disease burden. Exp Hematol 2005; 33:120-30. [PMID: 15661405 DOI: 10.1016/j.exphem.2004.10.007] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2004] [Revised: 10/04/2004] [Accepted: 10/06/2004] [Indexed: 11/19/2022]
Abstract
OBJECTIVE Minimal residual disease (MRD) present in peripheral blood stem cell (PBSC) products of AML patients may contribute to relapse. Our goal was to 1) predict leukemia recurrence based on the frequency of MRD present in PBSC products, 2) establish the efficacy of different purging procedures, and 3) integrate this into a model that enables to predict whether or not to purge. METHODS Minimal residual disease was measured with flow cytometry using leukemia-associated phenotypes as established at diagnosis. Toxicity of purging procedures was established using clonogenic assays. Purging procedures used were cryopreservation, hyperthermia, ether lipid ET-18-OCH3, and combinations. RESULTS Minimal residual disease in PBSC products correlated significantly with relapse-free survival (n=24, p=0.003). At a cut-off value of 0.05% MRD the relative risk of relapse was 4.6 times lower in the group with less than 0.05% MRD. As measured in 54 PBSC products, the MRD level was less than 0.05% in 17 of 54 cases, between 0.05% and 0.5% in 19 of 54 cases, and higher than 0.5% in 18 of 54 cases. Based on the MRD cut-off of 0.05%, the log tumor reduction needed to achieve this threshold is zero for the 17 of 54 cases in which MRD was below 0.05%, less than or equal to 1 log in 19 of 54 cases, and greater than 1-2 log in 18 of 54 cases. When applying purging with 25 mug/mL ET-18-OCH3 combined with cryopreservation at 10% DMSO and hyperthermia at 42 degrees C combined with cryopreservation at 10% or 4% DMSO, there was greater than or equal to 1 log depletion of AML blasts. CONCLUSION This study establishes (1) a threshold level for MRD above which prognosis is worse, (2) that stem cell products from 69% of patients have higher than this "safe" MRD level, and (3) that ET-18-OCH3 and hyperthermia may be used to purge products in part of these patients.
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Affiliation(s)
- Nicole Feller
- Department of Hematology, VU University Medical Center, Amsterdam, The Netherlands
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10
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Feller N, van der Pol MA, van Stijn A, Weijers GWD, Westra AH, Evertse BW, Ossenkoppele GJ, Schuurhuis GJ. MRD parameters using immunophenotypic detection methods are highly reliable in predicting survival in acute myeloid leukaemia. Leukemia 2004; 18:1380-90. [PMID: 15201848 DOI: 10.1038/sj.leu.2403405] [Citation(s) in RCA: 134] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Outgrowth of minimal residual disease (MRD) in acute myeloid leukaemia (AML) is responsible for the occurrence of relapses. MRD can be quantified by immunophenotyping on a flow cytometer using the expression of leukaemia-associated phenotypes. MRD was monitored in follow-up samples taken from bone marrow (BM) of 72 patients after three different cycles of chemotherapy and from autologous peripheral blood stem cell (PBSC) products. The MRD% in BM after the first cycle (n=51), second cycle (n=52) and third cycle (n=30), as well as in PBSC products (n=39) strongly correlated with relapse-free survival. At a cutoff level of 1% after the first cycle and median cutoff levels of 0.14% after the second, 0.11% after the third cycle and 0.13% for PBSC products, the relative risk of relapse was a factor 6.1, 3.4, 7.2 and 5.7, respectively, higher for patients in the high MRD group. Also, absolute MRD cell number/ml was highly predictive of the clinical outcome. After the treatment has ended, an increase of MRD% predicted forthcoming relapses, with MRD assessment intervals of < or =3 months. In conclusion, MRD parameter assessment at different stages of disease is highly reliable in predicting survival and forthcoming relapses in AML.
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Affiliation(s)
- N Feller
- Department of Hematology, VU University Medical Center, Amsterdam, The Netherlands
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11
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Affiliation(s)
- Dario Campana
- Departments of Hematology-Oncology and Pathology, St Jude Children's Research Hospital, University of Tennessee College of Medicine, Memphis, TN, USA
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12
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Feller N, Schuurhuis GJ, van der Pol MA, Westra G, Weijers GWD, van Stijn A, Huijgens PC, Ossenkoppele GJ. High percentage of CD34-positive cells in autologous AML peripheral blood stem cell products reflects inadequate in vivo purging and low chemotherapeutic toxicity in a subgroup of patients with poor clinical outcome. Leukemia 2003; 17:68-75. [PMID: 12529662 DOI: 10.1038/sj.leu.2402781] [Citation(s) in RCA: 59] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2002] [Accepted: 08/30/2002] [Indexed: 11/09/2022]
Abstract
In this study, a high CD34% in autologous peripheral blood stem cell (PBSC) products from 71 AML patients was associated directly with a high relapse rate (P = 0.006) and inversely with disease-free survival (P = 0.003), irrespective whether patients were transplanted or not. The relapse rate at 12 months was 67% in a group with >0.8% CD34+ cells and 34% in a group with < or = 0.8% CD34+ cells. Although the percentage of malignant CD34+ cells in the CD34+ compartment in the relapses of the first group was not high (median 8%), the total number of malignant cells as a percentage of WBC was about 13 times higher than for the patients remaining >12 months in remission. When all patients evaluable were taken together, this frequency of malignant cells correlated strongly with disease-free survival (P < 0.001). Both this massive mobilization of normal CD34+ cells and high frequency of malignant cells in the subgroup of patients with CD34 >0.8% and relapse within 12 months indicate an insufficient in vivo purging, as well as low chemotherapeutic bone marrow toxicity. This was confirmed by an inverse correlation between hypoplasia period after the induction therapy and CD34% in PBSC products (P < 0.002). It is concluded that a subgroup of patients has been identified that might benefit from a more intensive chemotherapeutic treatment.
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MESH Headings
- Acute Disease
- Adolescent
- Adult
- Antigens, CD/metabolism
- Antigens, CD34/immunology
- Antineoplastic Combined Chemotherapy Protocols/adverse effects
- Antineoplastic Combined Chemotherapy Protocols/therapeutic use
- Cell Movement/drug effects
- Combined Modality Therapy
- Female
- Granulocyte Colony-Stimulating Factor/therapeutic use
- Hematopoietic Stem Cell Transplantation/adverse effects
- Humans
- Leukemia, Myeloid/immunology
- Leukemia, Myeloid/pathology
- Leukemia, Myeloid/therapy
- Leukocyte Count
- Male
- Middle Aged
- Neoplasm Recurrence, Local/immunology
- Neoplasm Recurrence, Local/pathology
- Neoplasm Recurrence, Local/therapy
- Neoplasm, Residual/metabolism
- Phenotype
- Prognosis
- Remission Induction
- Survival Rate
- Transplantation, Autologous
- Treatment Outcome
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Affiliation(s)
- N Feller
- Department of Hematology, VU University Medical Center, Amsterdam, The Netherlands
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13
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Paietta E. Assessing minimal residual disease (MRD) in leukemia: a changing definition and concept? Bone Marrow Transplant 2002; 29:459-65. [PMID: 11960263 DOI: 10.1038/sj.bmt.1703388] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The term minimal residual disease (MRD) in its currently accepted application refers to low-level disease detected in a whole variety of clinical situations. It is used to describe residual disease after suboptimal induction chemotherapy, but at the same time refers to the lowest levels of disease potentially compatible with cure or to molecularly defined relapse after long-term remission. This discussion intends to redefine MRD into some biologically relevant subcategories which may warrant their own independent terminology.
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Affiliation(s)
- E Paietta
- Our Lady of Mercy Cancer Center, New York Medical College, 600 East 233rd Street, Bronx, NY 10466, USA
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