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Conditioning Regimens

Dose-intense paclitaxel, etoposide and cyclophosphamide: a safe and active regimen for tumor cytoreduction and stem cell mobilization in metastatic breast cancer

Abstract

Patients with metastatic breast cancer in complete remission are the ones most likely to have an improved outcome with subsequent high-dose chemotherapy and autologous peripheral blood stem cell transplantation (HDC-PBSCT). Peripheral blood stem cells are usually procured following mobilization with single agent chemotherapy and colony-stimulating factor support. We utilized a dose-intense regimen of paclitaxel 200 mg/m2 i.v., etoposide 60 mg/kg i.v., and cyclophosphamide 3 g/m2 i.v. (TEC) followed by daily administration of granulocyte colony-stimulating factor. The aim was not only to mobilize stem cells but also to achieve optimal tumor cytoreduction prior to HDC/PBSCT. One hundred consecutive patients with metastatic breast cancer received 257 cycles of TEC between March 1994 and June 1997, with the aim of collecting 5 × 106 CD34-positive cells/kg usually following the second cycle of chemotherapy. Patient characteristics included a median age of 45 years, a median of two organ systems involved by disease, a median of two prior chemotherapy regimens and eight prior chemotherapy cycles, and a median interval of 8 months from diagnosis of metastases to first cycle of TEC. There were 61 febrile episodes during neutropenia and 13 of these were associated with bacteremia or fungemia. Mortality rate was 1%. An adequate number of stem cells was collected in 90% of patients. The overall response rate of the tumor was 58.8% with 23.7% complete responders among 97 evaluable patients. Multivariate analysis demonstrated chemosensitivity to the most recent standard chemotherapy regimen administered for metastatic disease, an ECOG performance score of 0 as opposed to 1, 2 or 3, and involvement by disease of only one organ system as significant variables for achieving a complete remission with TEC. This novel dose-intense regimen was safe and well tolerated, highly active against metastatic breast cancer, and capable of excellent stem cell mobilization. Bone Marrow Transplantation (2000) 25, 123–130.

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Bilgrami, S., Feingold, J., Bona, R. et al. Dose-intense paclitaxel, etoposide and cyclophosphamide: a safe and active regimen for tumor cytoreduction and stem cell mobilization in metastatic breast cancer. Bone Marrow Transplant 25, 123–130 (2000). https://doi.org/10.1038/sj.bmt.1702125

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