Similarly, the care of patients with rare hereditary syndromes treated at other units within the Hospital das Clínicas, such as Multiple Endocrine Neoplasia type 1 (MEN-1) ‒ in which gastrin-producing pancreatic tumors may lead to secondary gastric neuroendocrine tumors ‒ may also explain this finding. The gene discussed is GAST; the disease is multiple endocrine neoplasia type 1.