Achieving NKF-K/DOQI™ bone metabolism and disease treatment goals with cinacalcet HCl

Abstract

Background. The National Kidney Foundation's Kidney Disease Outcomes Quality Initiative (NKF-K/DOQI™) has established guidelines for treatment of secondary hyperparathyroidism (HPT). The ability of cinacalcet HCl (Sensipar™) treatment to improve achievement of target levels of parathyroid hormone (PTH), calcium, phosphorus, and calcium-phosphorus product (Ca x P) was investigated in subjects on dialysis with secondary HPT. Methods. Data were combined from three placebo-controlled, double-blind, 26-week studies with similar design that randomized 1136 subjects on dialysis to receive traditional therapy plus cinacalcet or placebo. Oral cinacalcet was titrated from 30 to 180 mg/day. Achievement of K/DOQI goals was determined for each treatment group overall and for subgroups defined by baseline intact PTH (iPTH) and Ca x P levels. Results. Cinacalcet-treated subjects were more likely to achieve a mean iPTH ≤300 pg/mL (31.8 pmol/L) than were control subjects on traditional therapy (56% vs. 10%, P < 0.001). Cinacalcet-treated subjects were more likely to achieve concentrations of serum calcium within 8.4 to 9.5 mg/dL (2.10-2.37 mmol/L) and serum phosphorus within 3.5 to 5.5 mg/dL (1.13-1.78mmol/L) than were control subjects (49% vs. 24% and 46% vs. 33%, P < 0.001 for each). Cinacalcet also improved achievement of Ca x P < 55 mg2/dL2 (4.44 mmol2/L2) and concurrent achievement of Ca x P < 55 mg2/dL2 (4.44 mmol2/L2) and iPTH ≤300 pg/mL (31.8 pmol/L) (65% vs. 36% and 41% vs. 6%, P < 0.001 for each). Conclusion. In subjects on dialysis with secondary HPT, cinacalcet facilitates achievement of the K/DOQI-recommended targets for PTH, calcium, phosphorus, and Ca x P.