The first of the study patients with AHH was a 76-year-old man with a chief complaint of appetite loss and in whom PTH-dependent hypercalcemia with hypocalciuria was detected (cCa, 13.8 mg/dL; iP, 1.9 mg/dL; Cre, 0.82 mg/dL; intact PTH, 60 pg/mL; and FECa of 0.32%; Table 1). The gene discussed is PTH; the disease is hypercalcemia disease.