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Taxane/Anthracycline Combinations: Setting a New Standard in Breast Cancer?

University of California at Los Angeles, Jonsson Comprehensive Cancer Center at UCLA, Los Angeles, California, USA

Correspondence: Jean-Marc Nabholtz, M.D., University of California at Los Angeles, Cancer Therapy Development Program, Jonsson Comprehensive Cancer Center at UCLA, Breast Cancer International Research Group (BCIRG), 10945 Le Conte Avenue, Los Angeles, California 90095-7077, USA. Telephone: 310-206-8452; Fax: 310-794-0079; e-mail: jean-marc.nabholtz{at}bcirg.com

Among the novel chemotherapeutic drugs introduced in the 1990s, the taxanes have emerged as the most powerful compounds in breast cancer. Both compounds, paclitaxel and docetaxel, have been evaluated in metastatic settings before adjuvant trials proceeded. Docetaxel was shown in several phase III trials to be superior, particularly in terms of survival, for salvaging polychemotherapies after failure of prior chemotherapy, including that with anthracyclines. A benefit of docetaxel was also reported when compared with doxorubicin after failure of alkylating agents. In phase III trials paclitaxel was reported to be as efficacious over 24 hours as doxorubicin 60 mg/m², while paclitaxel was significantly inferior to doxorubicin 75 mg/m² over 3 hours and was close to CMF in another trial. The role of taxanes in combination with anthracyclines in first-line therapy of advanced breast cancer is emerging. Following several phase II studies, a phase III trial showed the significant superiority of docetaxel/doxorubicin (AT) versus doxorubicin/cyclophosphamide (AC) in terms of response and time to progression. In several phase II studies with paclitaxel (3 hours), anthracyclines in the metastatic setting showed high efficacy but produced cardiac toxicity related to a pharmacokinetic interaction between the two agents. This finding led to the implementation of metastatic strategies (phase III trials) aimed at avoiding the pharmacokinetic interaction, while the adjuvant strategies with paclitaxel focused primarily on the sequential approach (AC followed by paclitaxel). In contrast, adjuvant strategies with docetaxel/anthracycline-based programs were implemented following both sequential and combination approaches.

Key Words. Taxane • Anthracycline • Metastatic breast cancer • Doxorubicin • Docetaxel • Adjuvant

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