The patient who experienced asymptomatic hypocalcemia (non-serious adverse event, CTCAE grade 3) on day 1, hour 8 after cinacalcet administration was a female with baseline total Ca = 2.1 mmol/L; albumin corrected Ca (cCa) = 2.2 mmol/L, ionized Ca = 0.9 mmol/L (in the normal range for pediatric subjects) with an elevated baseline PTH of 126.4 pmol/L (1191 pg/mL), and a phosphorus = 1.71 mmol/L. The gene discussed is PTH; the disease is Hypocalcemia.