Charu Aggarwal, MD, MPH, of the University of Pennsylvania’s Abramson Cancer Center in Philadelphia, H. Jack West, MD, of the City of Hope Comprehensive Cancer Center in the Los Angeles area, and Devika Das, MD, of the University of Alabama at Birmingham discuss the distinction between uncommon EGFR mutations and sensitizing mutations, as well as the lack of data on how to treat these patients with tyrosine kinase inhibitors.