Mean hepcidin levels were significantly lower in 7 patients with juvenile hemochromatosis (12.8 μg/L) and 10 patients with iron deficiency anemia (15.7 μg/L) and higher in 7 patients with Hodgkin lymphoma (116.7 μg/L) compared to 32 age-matched healthy controls (42.7 μg/L). The gene discussed is HAMP; the disease is hemochromatosis type 2.