Which of the following markers is not typically expressed by neuroendocrine tumours?
CK7 is an epithelial cell marker and is positive in carcinomas (especially the epithelial tumours arising from foregut). The following immunohistochemical markers are positive in neuroendocrine neoplasms: Synaptophysin Chromogranin A CD56 Neuron specific enolase (NSE)
Synaptophysin
Chromogranin
CD56
CK7
Peptic Ulcer Disease