Abstract
Purpose
Several studies have provided evidence on the prognostic relevance of circulating tumor cells (CTCs) detected before and after chemotherapy regarding overall survival (OS) and progression-free survival (PFS) in early breast cancer (EBC). We provide data on the prevalence of CTCs 2 and 5 years after primary diagnosis in a cohort of patients with EBC.
Methods
The SUCCESS study is a multicenter, prospective, randomized trial comparing PFS in primary breast cancer patients undergoing one of two adjuvant chemotherapy regimens followed by 2 versus 5 years of treatment with zoledronate. CTCs from patients without signs of breast cancer recurrence were analyzed in peripheral blood using the FDA cleared CellSearch® System (Veridex, USA) 2 and 5 years after primary diagnosis.
Results
CTCs were detected at 2 and 5 years after primary diagnosis in 96 (16.7%) and 47 (8.2%) of the 574 patients, respectively. There were no associations between CTC status and patient and tumor characteristics or treatment regimens. In 442 (77.0%) patients, no CTCs were detected at either of the two time points, and in 11 patients (1.9%), CTCs were found at both 2 and 5 years after primary diagnosis. In 85 (14.8%) patients, CTCs were present 2 years after primary diagnosis but not after 5 years, while 36 (6.3%) patients had CTCs in their blood only at the 5-year follow-up.
Conclusions
In patients with EBC, CTCs can be detected even 5 years after primary diagnosis without clinical signs of disease recurrence.
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Funding
This translational research portion of the SUCCESS A trial has been supported by AstraZeneca, Chugai, Lilly, Novartis, Sanofi-Aventis, and Veridex.
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B. Rack, A. Schneeweiss, T. Fehm, M. W. Beckmann, and W. Janni have received research funding from AstraZeneca, Chugai, Lilly, Novartis, and Sanofi-Aventis. B. Rack, T. Fehm, K. Pantel, and W. Janni received research funding and speaker honoraria from Veridex. M. W. Beckmann acted as advisors for Novartis and Sanofi-Aventis. A. Schneeweiss received speaker honoraria from AstraZeneca, Chugai, Lilly, Novartis, and Sanofi-Aventis. C. P. A. Fasching received research funding and speaker honoraria from Novartis. E. C.A. Bauer, F. Schochter, P. Widschwendter, A. DeGregorio, T.W.P. Friedl, and C. Scholz have no conflict of interest to declare.
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All procedures performed in the study involving human participants were in accordance with the ethical standards of the institutional and national research committee and with the 1964 Helsinki Declaration, its later amendments, and comparable ethical standards.
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Written informed consent was obtained from all study participants prior to study inclusion.
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Bauer, E.C.A., Schochter, F., Widschwendter, P. et al. Prevalence of circulating tumor cells in early breast cancer patients 2 and 5 years after adjuvant treatment. Breast Cancer Res Treat 171, 571–580 (2018). https://doi.org/10.1007/s10549-018-4856-1
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DOI: https://doi.org/10.1007/s10549-018-4856-1