title: Hematopoietic progenitor cell collection in patients with chronic myelogenous leukemia in complete cytogenetic remission after imatinib mesylate therapy.
abstract: The introduction of BCR-ABL tyrosine kinase inhibitors such as imatinib has changed the treatment of chronic myelogenous leukemia (CML). More than 75% of patients achieve complete cytogenetic remission (CCR) after treatment with imatinib, which provides an opportunity to collect minimally involved hematopoietic progenitor stem cell (HPC) products. In order to assess the feasibility of HPC collection in patients with CML, we prospectively enrolled 24 patients who achieved CCR on therapy with imatinib. Two patients could not undergo HPC collection because of coagulopathy. A CD34+ cell yield of > or =2.0 x 10(6)/kg body weight was obtained in 16/22 (73%) patients. Patients who stopped imatinib for at least 3 weeks prior to HPC collection had significantly higher CD34+ cell yields (median: 6.52 x 10(6)/kg body weight) when compared with patients who continued imatinib through the collection (median: 3.74 x 10(6)/kg body weight). Mobilization with granulocyte colony-stimulating factor (G-CSF) did not increase the levels of BCR-ABL transcript. With a mean follow-up of 46 months, all patients but one were in CCR. In conclusion, a significant number of CD34+ cells can be safely collected in patients with CML who are on imatinib therapy, but CD34+ cell yields improve when imatinib is temporarily withheld.
authors.affiliation: Department of Stem Cell Transplantation and Cellular Therapy, University of Texas M. D. Anderson Cancer Center, Houston, TX 77030, USA.
authors.forename: Qaiser
authors.initials: Q
authors.lastname: Bashir
authors.forename: Marcos J
authors.initials: MJ
authors.lastname: De Lima
authors.forename: John D
authors.initials: JD
authors.lastname: McMannis
authors.forename: Guillermo
authors.initials: G
authors.lastname: Garcia-Manero
authors.forename: Elizabeth
authors.initials: E
authors.lastname: Shpall
authors.forename: Hagop
authors.initials: H
authors.lastname: Kantarjian
authors.forename: Jorge E
authors.initials: JE
authors.lastname: Cortes
authors.forename: Susan M
authors.initials: SM
authors.lastname: O'Brien
authors.forename: Dan
authors.initials: D
authors.lastname: Jones
authors.forename: Muzaffar
authors.initials: M
authors.lastname: Qazilbash
authors.forename: Wei
authors.initials: W
authors.lastname: Wei
authors.forename: Sergio A
authors.initials: SA
authors.lastname: Giralt
authors.forename: Richard E
authors.initials: RE
authors.lastname: Champlin
authors.forename: Chitra
authors.initials: C
authors.lastname: Hosing
mesh_terms: D000328:Adult; D018952:Antigens, CD34 / Q000378:metabolism; D000970:Antineoplastic Agents / Q000627:therapeutic use*; D001549:Benzamides; D005240:Feasibility Studies; D005260:Female; D016044:Fusion Proteins, bcr-abl / Q000235:genetics; D019650:Hematopoietic Stem Cell Mobilization; D006412:Hematopoietic Stem Cells / Q000502:physiology*; D006801:Humans; D000068877:Imatinib Mesylate; D007937:Leukapheresis / Q000379:methods*; D015464:Leukemia, Myelogenous, Chronic, BCR-ABL Positive / Q000188:drug therapy*; D008297:Male; D008875:Middle Aged; D010879:Piperazines / Q000627:therapeutic use*; D011446:Prospective Studies; D011505:Protein-Tyrosine Kinases / Q000235:genetics; D011743:Pyrimidines / Q000627:therapeutic use*; D012333:RNA, Messenger / Q000235:genetics; D012074:Remission Induction; D020133:Reverse Transcriptase Polymerase Chain Reaction; D015996:Survival Rate; D016896:Treatment Outcome
chemical_list: D018952:Antigens, CD34; D000970:Antineoplastic Agents; D001549:Benzamides; D010879:Piperazines; D011743:Pyrimidines; D012333:RNA, Messenger; D000068877:Imatinib Mesylate; D011505:Protein-Tyrosine Kinases; D016044:Fusion Proteins, bcr-abl