nse50ng/ml is not necessarily small cell lung cancer, but may also be other diseases, such as neuroblastoma, pheochromocytoma, autoimmune hemolysis. nse is the abbreviation of neurospecific enolase, which is a kind of tumor marker. nse elevation can be seen in small cell lung cancer, and is often used as a screening tool for small cell lung cancer, but its specificity is poor, because its elevation can also be seen in neuroblastoma, pheochromocytoma, pancreatic neuroendocrine tumors, autoimmune hemolysis, cerebral hemorrhage, and other diseases. Therefore, nse50 is not necessarily small cell lung cancer, but may also be other diseases. Patients found to have abnormalities of neurospecific enolase are recommended to further improve the relevant examinations under the guidance of the doctor, to find the specific cause of the disease, and actively treat it.