SAN ANTONIO – Most women with hormone receptor–positive breast cancer treated with an aromatase inhibitor will eventually develop resistance to these agents. Strategies for overcoming resistance include the addition of everolimus (Affinitor) to a steroidal aromatase inhibitor (AI) such as exemestane (Aromasin), as in the BOLERO-2 trial.
Alternatively, blocking estrogen-receptor signaling through the use of a selective estrogen receptor down regulator, such as fulvestrant (Faslodex), may result in more complete blockade of the ER signaling pathway than would a steroidal AI such as exemestane.
In this video interview at the San Antonio Breast Cancer Symposium, Noah S. Kornblum, MD, of the Montefiore-Einstein Center for Cancer Care, New York, discusses findings from the phase II PrECOG 0102 trial comparing a combination of fulvestrant and everolimus to fulvestrant and placebo for the treatment of postmenopausal women with hormone receptor–positive, HER2-negative breast cancer resistant to AI therapy.
The combination was associated with a median progression-free survival of 10.4 months, compared with 5.1 months for fulvestrant plus placebo (hazard ratio, 0.60; P = .02).
Dr. Kornblum says that the study provides additional evidence for adding everolimus to anti-estrogen therapy in AI-resistant disease.