IFNA2 and duodenal gastrin-producing neuroendocrine tumor: Analysis of the sample from patient #147 (female, 45 years old) with genetically proven multiple endocrine neoplasia type 1 (primary hyperparathyroidism; multiple insulinomas, non-functioning pancreatic tumors, and duodenal gastrinomas; lung carcinoids and multifocal hormonally inactive formations of both adrenal glands; and hyperprolactinemia) revealed autoantibodies against IFN-α-2a.