SNC115 Injections in Patients With Recurrent/Refractory Small Cell Lung Cancer and Lung Large Cell Neuroendocrine Carcinoma

This study is testing a new CAR-T cell therapy called SNC115 — where your own immune cells are engineered to attack cancer — for people with small cell lung cancer or a related type of lung cancer (large cell neuroendocrine carcinoma) that has come back or stopped responding to treatment. **You may be eligible if...** - You are 18 or older - You have been diagnosed with small cell lung cancer or pulmonary large cell neuroendocrine carcinoma - Your cancer has relapsed or did not respond to at least one standard treatment - You are in reasonably good health (performance status 0–1) - You have at least one measurable tumor **You may NOT be eligible if...** - You have had previous CAR-T or gene-modified cell therapy - You have untreated or symptomatic brain metastases - You have serious autoimmune disease, heart problems, or uncontrolled fluid around your lungs or heart - You are allergic to key drugs used in the study process Talk to your doctor to see if this trial is right for you.