While parathyroid adenomas from patients that lost both MEN1 alleles showed no expression of MEN1 mRNA, of menin, or of miR-24-1, MEN1 parathyroid adenomas from patients that maintain one wild type copy of the MEN1 gene showed, as expected, a reduced expression of MEN1 mRNA, but no expression of menin, while miR-24-1 was expressed. The gene discussed is MEN1; the disease is parathyroid gland adenoma.