Neuroendocrine Tumor Marker Test - Immunohistochemistry (IHC) for Chromogranin A

Immunohistochemistry for Chromogranin A (CgA) aims to detect this acidic protein found within the secretory granules of neuroendocrine cells. CgA is one of the most sensitive and specific markers for identifying Neuroendocrine Tumors (NETs), helping to distinguish them from other tumors like carcinoma or sarcoma.