From The Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins, Baltimore, Maryland; NSABP Division of Pathology, Pittsburgh, Pennsylvania; and the University of Southern California, Norris Comprehensive Cancer Center, Los Angeles, California
Authors disclosures of potential conflicts of interest are found at the end of this article.
Address reprint requests to Antonio C. Wolff, MD, Assistant Professor of Oncology, The Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins, 1650 Orleans Street, Room 189, Baltimore, MD 21231; e-mail: awolff{at}jhmi.edu
Overview: This review will list current approaches to HER2 testing, describe current controversies in predictive markers for HER2-directed therapy, and describe recent data on improved approaches to HER2 testing.