Journal of Clinical Oncology, Vol 23, No 7 (March 1), 2005: pp. 1420-1430
© 2005 American Society of Clinical Oncology.
DOI: 10.1200/JCO.2005.08.140
Circulating Tumor Cells: A Novel Prognostic Factor for Newly Diagnosed Metastatic Breast Cancer
Massimo Cristofanilli,
Daniel F. Hayes,
G. Thomas Budd,
Mathew J. Ellis,
Alison Stopeck,
James M. Reuben,
Gerald V. Doyle,
Jeri Matera,
W. Jeffrey Allard,
M. Craig Miller,
Herbert A. Fritsche,
Gabriel N. Hortobagyi,
Leon W.M.M. Terstappen
From The University of Texas M.D. Anderson Cancer Center, Houston, TX; The University of Michigan Comprehensive Cancer Center, Ann Arbor, MI; The Cleveland Clinic, Cleveland, OH; Washington University, St Louis, MO; University of Arizona, Phoenix, AZ; and Immunicon Corporation, Huntingdon Valley, PA
Address reprint requests to Massimo Cristofanilli, MD, FACP, Department of Breast Medical Oncology, The University of Texas M.D. Anderson Cancer Center, 1515 Holcombe Blvd, Box 424, Houston, TX 77030; e-mail: mcristof{at}mdanderson.org
PURPOSE: Metastatic breast cancer (MBC) is incurable; its treatment is palliative. We investigated whether the presence of circulating tumor cells (CTCs) predicts treatment efficacy, progression-free survival (PFS), and overall survival (OS) in patients with newly diagnosed MBC who were about to start first-line therapy.
PATIENTS AND METHODS: One hundred seventy-seven patients with measurable MBC were enrolled onto a prospective study. Eighty-three of the 177 patients were entering first-line treatment, and these patients are the focus of this analysis. CTCs from 7.5 mL of whole blood drawn before treatment initiation (baseline) and monthly thereafter for up to 6 months were isolated and enumerated using immunomagnetics.
RESULTS: The mean (± standard deviation) follow-up time was 11.1 ± 4.4 months (median, 12.2 months). Forty-three patients (52%) had five CTCs at baseline. The median PFS was 7.2 months (95% CI, 4.9 to 9.4 months), and the median OS was more than 18 months. Patients with five CTCs at baseline and at first follow-up (4 weeks) had a worse prognosis than patients with less than five CTCs (baseline: median PFS, 4.9 v 9.5 months, respectively; log-rank, P = .0014; median OS, 14.2 v > 18 months, respectively; log-rank, P = .0048; first follow-up: median PFS, 2.1 v 8.9 months, respectively; log-rank, P = .0070; median OS, 11.1 v > 18 months, respectively; log-rank, P = .0029). CTCs before and after the initiation of therapy were strong, independent prognostic factors.
CONCLUSION: Detection of CTCs before initiation of first-line therapy in patients with MBC is highly predictive of PFS and OS. This technology can aid in appropriate patient stratification and design of tailored treatments.
Supported by Immunicon Corporation, Huntingdon Valley, PA.
Authors disclosures of potential conflicts of interest are found at the end of this article.

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