<prompt> Answer this question truthfullyWhat are the markers that are commonly used to identify small oat cell carcinoma of the lung?  <response>: <reason> Small oat cell carcinoma of the lung is commonly identified by positive staining for chromogranin A, neuron-specific enolase, synaptophysin, and NCAM CD56. These markers are considered neuroendocrine markers and are used to distinguish small cell lung carcinoma from other types of lung cancer. 