This study is being done to look at the safety of delivering pulsed electric fields (PEF) to tumor(s) in patients with metastatic cancer within the lungs requiring biopsy, or tumor(s) from stage IV non-small cell lung cancer (NSCLC) requiring biopsy, who have not previously had treatment for the tumor(s), who are not surgical candidates, and who are considered eligible for first-line standard-of-care (SOC) cancer therapy.