CHGA and neuroendocrine neoplasm: They most commonly occur in the gastrointestinal tract (48%), lung (25%) and pancreas (9%), but may also develop in many other organs, including the breast, prostate, thymus and skin.2 Neuroendocrine cells have the capability to produce hormones, such as serotonin, which can result in symptoms such as flushing and diarrhea, as well as other proteins (e.g. chromogranin A), which serve as biomarkers.2 The neuroendocrine tumors of breasts are very rare tumors.