Phase III study on efficacy of taxanes plus bevacizumab with or without capecitabine as first-line chemotherapy in metastatic breast cancer

Abstract

Taxanes (T) plus bevacizumab (B) and taxanes plus capecitabine (X) showed better progression-free survival (PFS) compared to taxanes alone. Since life-threatening or highly symptomatic situations require polychemotherapy in metastatic breast cancer (MBC), combination of taxanes, capecitabine plus bevacizumab appears reasonable. TABEA (NCT01200212), a prospectively randomized, open-label, phase III trial compares taxanes (paclitaxel 80 mg/m2 i.v. d1,8,15 q22 or docetaxel 75 mg/m2 i.v. d1 q22) plus bevacizumab (15 mg/kg i.v. d1 q22) with (TBX) or without capecitabine (TB, 1800 mg/m2 daily d1–14 q22) as first-line therapy in MBC. Histologically confirmed HER2-negative, locally advanced or MBC patients with a chemotherapy indication and measurable or non-measurable target lesions (RECIST criteria) were included. Primary objective was PFS. Secondary objectives were response rate and duration, clinical benefit rate (complete response, partial response, stable disease ≥24 weeks), 3-year overall survival, PFS in patients ≥65 years, toxicity, and compliance. We assumed 10 and 13.3 months PFS for TB and TBX, respectively (HR = 0.75), requiring 432 patients and 386 events. Preplanned interim futility and safety analyses after 100 events in 202 patients showed no efficacy benefit and higher toxicity for TBX. Recruitment and therapy were stopped following advice from the IDMC. Final analysis revealed a HR 1.13 [95 %CI 0.806–1.59], P = 0.474, for PFS. Overall grade 3–4 adverse event (77.3 vs. 62.1 %, P = 0.014) and serious adverse event (40.0 vs. 30.2 %, P = 0.127) rates were higher for TBX after 26.1 months median follow-up, with six deaths for TBX versus 1 for TB. Adding capecitabine to TB cannot be recommended as first-line therapy in MBC.

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Acknowledgments

This work was supported by Roche Germany. The funders had no access to the study database and were not involved in the analysis and interpretation of the results. No grant number applicable.

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All other authors declare that they have no conflict of interest.

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Correspondence to Sibylle Loibl.

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Lück, HJ., Lübbe, K., Reinisch, M. et al. Phase III study on efficacy of taxanes plus bevacizumab with or without capecitabine as first-line chemotherapy in metastatic breast cancer. Breast Cancer Res Treat 149, 141–149 (2015). https://doi.org/10.1007/s10549-014-3217-y

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Keywords

  • Metastatic breast cancer
  • Capecitabine
  • Bevacizumab
  • Taxane
  • Response
  • Progression-free survival