Current Landscape of Personalized Therapy.

Almost a half of patients diagnosed with non-small cell lung cancer (NSCLC) present with incurable disease, and a significant number of patients who are treated with curative intent for early-stage disease will eventually recur. Systemic therapy is selected based on tumor histology, squamous versus nonsquamous NSCLC, molecular testing, and PD-L1 score. Depending on PD-L1 score, patients are eligible for immunotherapy alone or in combination with chemotherapy in the first-line setting. Oncogenic driver mutations can be detected in approximately 50% of patients with nonsquamous NSCLC of which several can be targeted therapeutically with small molecular inhibitors. Continued research is needed for more specific agents with less toxicity and better central nervous system penetration, and agents to treat patients who develop resistance against targeted treatments and immunotherapy.