PTH and Hypercalcemia: During the study period, severe SHPT was observed in 18.3% of cases: Twenty-four patients were administrated cinacalcet for persistent serum PTH above 800 pg/mL (n = 18), serum PTH > 400 pg/mL with persistent hypercalcaemia (n = 2), or high serum bone marker level (n = 2).