title: Ifosfamide in combination with paclitaxel or doxorubicin: regimens which effectively mobilize peripheral blood progenitor cells while demonstrating anti-tumor activity in patients with metastatic breast cancer.
abstract: For patients with metastatic breast cancer (MBC) who undergo high-dose therapy with autologous peripheral blood progenitor cell (PBPC) transplantation, an important prerequisite is a mobilization regimen that efficiently mobilizes PBPCs while producing an effective anti-tumor effect. We prospectively evaluated ifosfamide-based chemotherapy for mobilization efficiency, toxicity and disease response in 37 patients. Patients received two cycles of the ifosfamide-based regimen; ifosfamide (5 g/m2 with conventional-dose cycle and 6 g/m2 with mobilization cycle) with either 50 mg/m2 doxorubicin (if limited prior anthracycline and/or progression more than 12 months after an anthracycline-based regimen) or 175 mg/m2 paclitaxel. For the mobilization cycle, all patients received additional G-CSF (10 microg/kg SC, daily) commencing 24 h after completion of chemotherapy. The target yield was >6x10(6) CD34+ cells/kg, sufficient to support the subsequent three cycles of high-dose therapy. The mobilization therapy was well tolerated and the peak days for peripheral blood (PB) CD34+ cells were days 10-13 with no significant differences in the PB CD34+ cells mobilization kinetics between the ifosfamide-doxorubicin vs. ifosfamide-paclitaxel regimens. The median PBPC CD34+ cell content ranged from 2.9 to 4.0x10(6)/kg per day during days 9-14. After a median of 3 (range 1-5) collection days, the median total CD34+ cell, CFU-GM and MNC for all 44 individual sets of collections was 9.2x10(6)/kg (range 0.16-54.9), 37x10(4)/kg (range 5.7-247) and 7.3x10(8)/kg (range 2.1-26.1), respectively. The PBPC target yield was achieved in 35 of the 37 patients. The overall response rate for the 31 evaluable patients was 68% with 10% having progressive disease. Thirty-three patients have subsequently received high-dose therapy consisting of three planned cycles of high-dose ifosfamide, thiotepa and paclitaxel with each cycle supported with PBPCs. Rapid neutrophil and platelet recovery has been observed. Ifosfamide with G-CSF in combination with doxorubicin or paclitaxel achieves effective mobilization of PBPC and anti-tumor activity with minimal toxicity.
authors: Blood and Marrow Transplant Service, Division of Haematology and Medical Oncology, Peter MacCallum Cancer Institute, Melbourne, Victoria, Australia.
authors: H M
authors: HM
authors: Prince
authors: J
authors: J
authors: Gardyn
authors: M J
authors: MJ
authors: Millward
authors: D
authors: D
authors: Rischin
authors: P
authors: P
authors: Francis
authors: P
authors: P
authors: Gates
authors: P
authors: P
authors: Chapple
authors: M
authors: M
authors: Quinn
authors: S
authors: S
authors: Juneja
authors: M
authors: M
authors: Wolf
authors: E H
authors: EH
authors: Januszewicz
authors: G
authors: G
authors: Richardson
authors: J
authors: J
authors: Scarlett
authors: P
authors: P
authors: Briggs
authors: M
authors: M
authors: Brettell
authors: G C
authors: GC
authors: Toner
mesh_terms: D000328:Adult; D000971:Antineoplastic Combined Chemotherapy Protocols / Q000008:administration & dosage*; D001772:Blood Cell Count / Q000187:drug effects; D001943:Breast Neoplasms / Q000473:pathology / Q000628:therapy*; D003131:Combined Modality Therapy; D004317:Doxorubicin / Q000008:administration & dosage*; D005260:Female; D019650:Hematopoietic Stem Cell Mobilization; D018380:Hematopoietic Stem Cell Transplantation; D006412:Hematopoietic Stem Cells / Q000187:drug effects / Q000473:pathology; D006801:Humans; D007069:Ifosfamide / Q000008:administration & dosage*; D009362:Neoplasm Metastasis; D017239:Paclitaxel / Q000008:administration & dosage*; D011446:Prospective Studies
chemical_list: D004317:Doxorubicin; D017239:Paclitaxel; D007069:Ifosfamide