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Erin Currin, Lanell M. Peterson, Erin K. Schubert, Jeanne M. Link, Kenneth A. Krohn, Robert B. Livingston, David A. Mankoff, and Hannah M. Linden

Changes in estrogen receptor (ER) expression over the course of therapy may affect response to endocrine therapy. However, measuring temporal changes in ER expression requires serial biopsies, which are impractical and poorly tolerated by most patients. Functional ER imaging using 18F-fluoroestradiol (FES)-PET provides a noninvasive measure of regional ER expression and is ideally suited to serial studies. Additionally, lack of measurable FES uptake in metastatic sites of disease predict tumor progression in patients with ER-positive primary tumors treated with endocrine therapy. This report presents a case of restored sensitivity to endocrine therapy in a patient with bone-dominant breast cancer who underwent serial observational FES-PET imaging over the course of several treatments at our center, demonstrating the temporal heterogeneity of regional ER expression. Although loss and restoration of endocrine sensitivity in patients who have undergone prior hormonal and cytotoxic treatments has been reported, this is, to our knowledge, the first time the accompanying changes in ER expression have been documented by molecular imaging.

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Metastatic Breast Cancer, Version 1.2012

Featured Updates to the NCCN Guidelines

Robert W. Carlson, D. Craig Allred, Benjamin O. Anderson, Harold J. Burstein, Stephen B. Edge, William B. Farrar, Andres Forero, Sharon Hermes Giordano, Lori J. Goldstein, William J. Gradishar, Daniel F. Hayes, Clifford A. Hudis, Steven Jay Isakoff, Britt-Marie E. Ljung, David A. Mankoff, P. Kelly Marcom, Ingrid A. Mayer, Beryl McCormick, Lori J. Pierce, Elizabeth C. Reed, Mary Lou Smith, Hatem Soliman, George Somlo, Richard L. Theriault, John H. Ward, Antonio C. Wolff, Richard Zellars, Rashmi Kumar, and Dorothy A. Shead

These NCCN Guidelines Insights highlight the important updates/changes specific to the management of metastatic breast cancer in the 2012 version of the NCCN Clinical Practice Guidelines in Oncology (NCCN Guidelines) for Breast Cancer. These changes/updates include the issue of retesting of biomarkers (estrogen receptor, progesterone receptor, and human epidermal growth factor receptor 2) on recurrent disease, new information regarding first-line combination endocrine therapy for metastatic disease, a new section on monitoring of patients with metastatic disease, and new information on endocrine therapy combined with an mTOR inhibitor as a subsequent therapeutic option.