The evidence supporting this protocol is provided by BOLERO-2, a phase III, double-blind, placebo-controlled, multicentre international randomised trial (2:1 ratio) involving 724 patients comparing everolimus (10 mg/day) and exemestane (25 mg/day) with exemestane alone in 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.r
The primary end point was progression-free survival. Secondary end points were overall survival, overall response rate, and safety.
Everolimus combined with exemestane improved progression-free survival in patients with hormone-receptor-positive advanced breast cancer previously treated with nonsteroidal aromatase inhibitors. Response rates were also superior in patients treated with combination therapy. Overall survival results were immature at the time of interim analysis.r,r
Efficacy
Final progression-free survival analysis by central assessment revealed a PFS benefit of 6.9 months with combination therapy (11.0 months for everolimus in combination with exemestane versus 4.1 months for exemestane alone; HR 0.38 (95%CI 0.31-0.48); log-rank p < 0.0001). Everolimus and exemestane treatment substantially extended PFS benefits compared with exemestane alone regardless of baseline disease or prior therapy characteristics.r At the time of analysis, fewer deaths were reported with combination therapy than in patients treated with exemestane alone (25.4% vs 32.2%). A final analysis of overall survival is planned after 398 events. Improvements were also observed in overall response, objective response rate and clinical benefit rate.r
Kaplan-Meier estimates progression-free survival r

© Adv Ther 2013
Overall survival and tumour responser

© AdvTher 2013
Toxicity
Adverse events r

© New England Journal of Medicine 2012