Alexander Spira, MD, PhD, FACP, Virginia Cancer Specialists, Fairfax, VA, discusses the use of the tyrosine kinase inhibitor (TKI) mobocertinib in patients with previously treated non-small cell lung cancer (NSCLC) who have EFGR exon 20 insertion mutations. A Phase I/II trial (NCT02716116) of mobocertinib in this patient population reported a preliminary response rate between 26% and 40%. This interview took place at the virtual American Association for Cancer Research (AACR) Annual Meeting 2021.