He was found at that time to have: PTH, < 1 pg/mL (15–65 pg/mL); 25 hydroxyvitamin D, 74 ng/mL (30–100 ng/mL); 1,25 dihydroxyvitamin D, 85.4 pg/mL (19.9–79.3 pg/mL); angiotensin-converting enzyme (ACE), 7 U/L (9–67 U/L); and multiple myeloma workup was negative. The gene discussed is ACE; the disease is plasma cell myeloma.