In this phase 2 study, we evaluated the activity of AUY922 in pretreated patients with stage IV NSCLC….Patients with advanced NSCLC were divided into molecularly defined strata based on mutations in the EGFR gene, the ALK receptor tyrosine kinase gene (ALK), the KRAS gene, or the wild type of all three....Biomarker data showed activity of AUY922 in EGFR-mutant patients with exon 19 deletion, T790M mutation, and exon 20 insertion....AUY922 is active in patients with NSCLC, particularly among patients with ALK rearrangements and EGFR mutations.