Everolimus in postmenopausal hormone-receptor-positive advanced breast cancer

José Baselga, Mario Campone, Martine Piccart, Howard A. Burris, Hope S. Rugo, Tarek Sahmoud, Shinzaburo Noguchi, Michael Gnant, Kathleen I. Pritchard, Fabienne Lebrun, J. Thaddeus Beck, Yoshinori Ito, Denise Yardley, Ines Deleu, Alejandra Perez, Thomas Bachelot, Luc Vittori, Zhiying Xu, Pabak Mukhopadhyay, David LebwohlGabriel N. Hortobagyi

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1817 Scopus citations

Abstract

BACKGROUND: Resistance to endocrine therapy in breast cancer is associated with activation of the mammalian target of rapamycin (mTOR) intracellular signaling pathway. In early studies, the mTOR inhibitor everolimus added to endocrine therapy showed antitumor activity. METHODS: In this phase 3, randomized trial, we compared everolimus and exemestane versus exemestane and placebo (randomly assigned in a 2:1 ratio) in 724 patients with hormone- receptor-positive advanced breast cancer who had recurrence or progression while receiving previous therapy with a nonsteroidal aromatase inhibitor in the adjuvant setting or to treat advanced disease (or both). The primary end point was progression-free survival. Secondary end points included survival, response rate, and safety. A preplanned interim analysis was performed by an independent data and safety monitoring committee after 359 progression-free survival events were observed. RESULTS: Baseline characteristics were well balanced between the two study groups. The median age was 62 years, 56% had visceral involvement, and 84% had hormone-sensitive disease. Previous therapy included letrozole or anastrozole (100%), tamoxifen (48%), fulvestrant (16%), and chemotherapy (68%). The most common grade 3 or 4 adverse events were stomatitis (8% in the everolimus-plus-exemestane group vs. 1% in the placebo-plus-exemestane group), anemia (6% vs. <1%), dyspnea (4% vs. 1%), hyperglycemia (4% vs. <1%), fatigue (4% vs. 1%), and pneumonitis (3% vs. 0%). At the interim analysis, median progression-free survival was 6.9 months with everolimus plus exemestane and 2.8 months with placebo plus exemestane, according to assessments by local investigators (hazard ratio for progression or death, 0.43; 95% confidence interval [CI], 0.35 to 0.54; P<0.001). Median progression-free survival was 10.6 months and 4.1 months, respectively, according to central assessment (hazard ratio, 0.36; 95% CI, 0.27 to 0.47; P<0.001). CONCLUSIONS:Everolimus combined with an aromatase inhibitor improved progression-free survival in patients with hormone-receptor-positive advanced breast cancer previously treated with nonsteroidal aromatase inhibitors. (Funded by Novartis; BOLERO-2 ClinicalTrials.gov number, NCT00863655.)

Original languageEnglish (US)
Pages (from-to)520-529
Number of pages10
JournalNew England Journal of Medicine
Volume366
Issue number6
DOIs
StatePublished - Feb 9 2012

ASJC Scopus subject areas

  • Medicine(all)

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    Baselga, J., Campone, M., Piccart, M., Burris, H. A., Rugo, H. S., Sahmoud, T., Noguchi, S., Gnant, M., Pritchard, K. I., Lebrun, F., Beck, J. T., Ito, Y., Yardley, D., Deleu, I., Perez, A., Bachelot, T., Vittori, L., Xu, Z., Mukhopadhyay, P., ... Hortobagyi, G. N. (2012). Everolimus in postmenopausal hormone-receptor-positive advanced breast cancer. New England Journal of Medicine, 366(6), 520-529. https://doi.org/10.1056/NEJMoa1109653