Concordance of Key Actionable Genomic Alterations as Assessed in Tumor Tissue and Plasma in Non Small Cell Lung Cancer

Inclusion Criteria: * Subjects must be 18 years or older. * Patients with stage IV non squamous NSCLC who are either newly diagnosed or progressing on any treatment (progression defined as increasing tumor size or new metastatic lesions on clinical or imaging assessment). * Patients with available tissue sample from a metastatic site or, if the patient presents with stage IV disease at diagnosis, from the primary tumor or a metastatic site. If a patient is progressing on EGFR targeted therapy (erlotinib, gefitinib, afatinib), tumor tissue sample is required only if available. * No new systemic anti-tumor therapy administered in the interval between the tissue biopsy and collection of the blood sample. (interval not to exceed eight weeks). Local radiation therapy is permitted. * Able and willing to read, understand and sign an informed consent and Health Insurance Portability and Accountability Act (HIPAA) authorization, or equivalent privacy law, where this is applicable. Exclusion Criteria: * Patients who are currently receiving therapy (targeted, immune- or chemotherapy) without sign of progression. * Patients with squamous NSCLC. * Patients with more than 8 weeks between collection of tumor specimen and collection of blood sample for analysis. (Not applicable for patients progressing on EGFR targeted therapy with no biopsy at progression) * Patients changing EGFR therapy due to toxicity or preference without documented disease progression. * Patients progressing on Osimertinib treatment. * Patients with brain metastases only. * Inability to comply with study and/or follow-up procedures. * Unable or unwilling to provide written informed consent.