Anatomic pathology selected abstracts
June 2024—Neuroendocrine neoplasms can arise in a variety of anatomic sites, including the gastrointestinal tract, pancreas, and lung. The authors conducted a study in which they examined the diagnostic utility of S100 protein expression by IHC. They reported on the expression of S100 protein in a tissue microarray composed of 919 primary and metastatic neuroendocrine neoplasms from 548 patients. S100 protein is commonly used by laboratories to identify neural and melanocytic neoplasms. It is occasionally used in the workup of neuroendocrine neoplasms when the diagnosis of paraganglioma is being considered.