Despite an overall decrease in tobacco use, lung cancer (80-85% of which is non-small-cell lung cancer [NSCLC]) is still the leading cause of cancer death in both men and women worldwide. Annual low-dose CT screening of high-risk individuals has the potential to detect early-stage tumors, which can usually be successfully treated with a combination of surgery, radiotherapy, and chemotherapy and, in some cases, targeted therapy. However, most patients with NSCLC still present with advanced or metastatic disease. For these patients, initial therapy is guided by the tumor's molecular...