Effect of everolimus on bone marker levels and progressive disease in bone in BOLERO-2 Journal Article


Authors: Gnant, M.; Baselga, J.; Rugo, H. S.; Noguchi, S.; Burris, H. A.; Piccart, M.; Hortobagyi, G. N.; Eakle, J.; Mukai, H.; Iwata, H.; Geberth, M.; Hart, L. L.; Hadji, P.; El-Hashimy, M.; Rao, S.; Taran, T.; Sahmoud, T.; Lebwohl, D.; Campone, M.; Pritchard, K. I.
Article Title: Effect of everolimus on bone marker levels and progressive disease in bone in BOLERO-2
Abstract: Background Breast Cancer Trials of Oral Everolimus 2 (BOLERO-2), a phase III study in postmenopausal women with estrogen receptor-positive breast cancer progressing despite nonsteroidal aromatase inhibitor therapy, showed statistically significant benefits with adding everolimus to exemestane. Moreover, in preclinical studies, mammalian target of rapamycin inhibition was associated with decreased osteoclast survival and activity. Exploratory analyses in BOLERO-2 evaluated the effect of everolimus on bone marker levels and progressive disease in bone. Methods Patients were treated with exemestane (25mg/day) and randomized (2:1) to everolimus (10mg/day; combination) or placebo (exemestane only). Exploratory endpoints included changes in bone turnover marker levels vs baseline and progressive disease in bone, defined as unequivocal progression of a preexisting bone lesion or the appearance of a new bone lesion. Results Baseline disease characteristics were well balanced between arms (N = 724); baseline bisphosphonate use was not (43.9% combination vs 54.0% exemestane only). At a median of 18 months of follow-up, median progression-free survival (primary endpoint) was statistically significantly longer with the combination vs exemestane only (Cox proportional hazard ratio = 0.45, 95% confidence interval = 0.38 to 0.54; log-rank, 1-sided P <. 0001). Bone marker levels at 6 and 12 weeks increased with exemestane only, as expected, but decreased with the combination. The cumulative incidence rate of progressive disease in bone was lower in the combination arm. Bone-related adverse events occurred with similar frequency in both arms (3.3% combination vs 4.2% exemestane only). Conclusion These exploratory analyses suggest that everolimus has beneficial effects on bone turnover and progressive disease in bone in patients receiving exemestane for hormone receptor-positive breast cancer progressing during/after nonsteroidal aromatase inhibitor therapy. © 2013 The Author.
Journal Title: JNCI: Journal of the National Cancer Institute
Volume: 105
Issue: 9
ISSN: 0027-8874
Publisher: Oxford University Press  
Date Published: 2013-05-01
Start Page: 654
End Page: 663
Language: English
DOI: 10.1093/jnci/djt026
PROVIDER: scopus
PUBMED: 23425564
PMCID: PMC6430494
DOI/URL:
Notes: --- - "Export Date: 3 June 2013" - "CODEN: JNCIA" - "Source: Scopus"
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  1. Jose T Baselga
    484 Baselga