A Pilot Study to Assess the Diversity of Gut Microbiome in Metastatic Non-Small Cell Lung Cancer (NSCLC) in Correlation to Treatment Effects and Adverse Effects

Inclusion Criteria: * 1\. Advanced/Metastatic non-small cell lung cancer NSCLC patients. * 2\. The patient himself/herself must be 18 years of age on day of signing informed consent. * 3\. The subject has signed the informed consent form. * 4\. The patient must be eligible to receive FDA approved and non-approved PD1 inhibitors (i.e. pembrolizumab, nivolumab) or PDL1 inhibitor (i.e. atezolizumab, durvalumab) either single agent or as combination therapy with chemotherapy, or be eligible to receive FDA approved and non-approved tyrosine kinase inhibitors. * 5\. The subject will be registered upon submission of the samples. When submitted on separate dates, the submission occurring later will be considered the date of registration Exclusion Criteria: * 1\. Those subjects who are determined clinically unstable of the participation of this study as determined by the PI or treating physician will be excluded and asked to focus on their treatment.