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Phase II Trial of High-Dose Chemotherapy with Autologous Stem Cell Transplant for Stage IV Breast Cancer with Minimal Metastatic Disease

University of Colorado Bone Marrow Transplant Program [Y. N., P. J. C., E. J. S., S. M., R. B. J., S. I. B.] and Department of Biostatistics [A. B.], Denver, Colorado 80262

The purpose of this study was to assess the efficacy of high-dose chemotherapy (HDC) with autologous stem cell transplant in stage IV breast cancer patients with minimal metastases. Eligible patients had (a) disease that could be resected en bloc and/or irradiated with curative intent using a single field and could, thus, be rendered as having no evidence of disease (NED); and/or (b) <5% bone marrow involvement. From September 1991 to August 1997, 40 consecutive patients were prospectively entered on the study. Pre-HDC local treatment consisted of surgery (n = 31) and radiotherapy (XRT; n = 3). All patients received HDC with cyclophosphamide, cisplatin, and 1,3-bis(2-chloroethyl)-1-nitrosourea and autologous stem cell transplant, with or without CD34 selection. Following HDC, 22 patients received XRT. Four patients died of treatment-related complications. Eighteen patients developed grade 3 nonhematological toxicities (15 lung, 2 cardiomyopathy, and 1 optic neuritis), which resolved with therapy. Within a median follow-up of 49 (15–91) months, 14 patients had relapsed. Twenty-five patients (62.5%) were alive, and 22 patients (55%) were alive and free of disease. Median event-free and overall survivals were 43 and 77 months, respectively. In the subset of patients with one metastatic site, 17 of 24 (68%) remained relapse free. Grade 2 tumors, a single metastatic site, and delivery of XRT were favorable predictors of relapse-free survival in univariate but not multivariate analyses. Inclusion of HDC, as described, in the multimodal treatment of stage IV breast cancer patients with minimal metastases is promising. These results warrant prospective randomized trials with a HDC-containing arm in this patient population.

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