Although there are many kinds of NETs but they are treated as a group of tumours as these neoplasms share common features such as histology, immunoreactivity for neuroendocrine markers (chromogranin A, synaptophysin, neuron specific enolase), presence of neurosecretory granules, and secretion of biogenic amines and polypeptide hormones. Here, ENO2 is linked to neoplasm.