Abstract
Purpose
Metronomic chemotherapy (MCT) refers to the chronic and equally spaced administration of low doses of different chemotherapy drugs, without extended interruptions. Previously, we demonstrated the antitumor effect of MCT with cyclophosphamide (Cy) in a mouse mammary adenocarcinoma model. Herein, we investigated the therapeutic efficacy of metronomic Cy combined with celecoxib (Cel) in two murine mammary adenocarcinoma models.
Methods
Mice were s.c. challenged with M-234p or M-406 mammary tumors and from day 5 or 8 on, respectively, treated with: (I) no treatment (controls); (II) Cy in the drinking water (25–30 mg/kg body weight/day); (III) Cel (30 mg/kg p.o.), five times/week; (IV) treated as II + III. Mice challenged i.v. with M-234p or M-406 tumor cells received, on day 3, the same treatments.
Results
We found that MCT with Cy plus Cel inhibited tumor growth decreased lung metastases, and increased the median survival time, in both tumor models, having very low toxicity. MCT with Cy combined with Cel was more effective than each monotherapy.
Conclusions
The therapeutic benefits of combined MCT with cyclophosphamide plus celecoxib on mammary adenocarcinomas together with its very low toxicity profile warrant further study in an attempt to make the translation into the clinic.
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Acknowledgments
We are grateful to Dr. M. J. Cisterna and Dr. H. H. Berra for the EKG determinations, to Wiener Lab for providing the reagents for hematological and serological determinations, and to Dr. Eduardo Roggero for his cooperation in the histopathologic analysis. Work in O.G.S. laboratory is supported by grants from National University of Rosario (Argentina). O.G.S. is a member of the scientific career of the Research Council of the National University of Rosario (CIUNR, Argentina).
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We declare that we have no conflict of interest.
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The authors L. E. Mainetti and V. R. Rozados contributed equally to this work.
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Mainetti, L.E., Rozados, V.R., Rossa, A. et al. Antitumoral and antimetastatic effects of metronomic chemotherapy with cyclophosphamide combined with celecoxib on murine mammary adenocarcinomas. J Cancer Res Clin Oncol 137, 151–163 (2011). https://doi.org/10.1007/s00432-010-0869-9
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DOI: https://doi.org/10.1007/s00432-010-0869-9