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Background This study assessed the efficacy, tolerability and pharmacokinetics (PK) of lanthanum carbonate (LC) in hyperphosphatemic children and adolescents with chronic kidney disease (CKD) undergoing dialysis. Methods This was a three-part, multicenter, open-label study of LC (oral powder formulation) in patients 10 to   12 years old) were summarized. In part 2, patients received calcium carbonate (CC [chewable tablet formulation]) (1500–6500 mg [total daily dose]) followed by LC (powder formulation) (1500–3000 mg [total daily dose]), or LC only (1500–3000 mg [total daily dose]), each for 8 weeks. During part 3, patients received LC (1500–3000 mg [total daily dose]) for up to 6 months. The primary efficacy endpoint was the proportion of LC-treated patients achieving serum phosphorus control after 8 weeks during parts 2 and/or 3, defined as: ≤1.94 mmol/L, &lt; 12 years old; ≤1.78 mmol/L, ≥12 years old. Secondary efficacy endpoints included: the proportion of patients who achieved serum phosphorus control after 8 weeks of treatment with CC followed by 8 weeks of treatment with LC (with a washout period between treatments). The safety of LC and CC was also evaluated. Results In part 1, 20 patients received a single dose of LC. In part 2, 53 and 51 patients were treated with CC and LC for 8 weeks, respectively. During part 3, 42 patients received LC for up to 6 months. Most patients were white and male. For the primary efficacy endpoint, 50% (17/34) of patients who received LC for 8 weeks during parts 2 and/or 3 achieved serum phosphorus control. After 8 weeks of treatment with CC, 58.8% of patients achieved serum phosphorus control; after a subsequent washout period and 8 weeks of treatment with LC, 70.6% of patients achieved serum phosphorus control. T max  and t 1/2  occurred within 3–8 h and ~ 19 h, respectively; however, variability was observed. LC and CC were generally well tolerated. Conclusions These data support the use of LC to manage hyperphosphatemia in pediatric patients with CKD undergoing dialysis. Trial registration ClinicalTrials.gov  identifier: NCT01696279; EudraCT identifier: 2012–000171-17. Date of registration: 01/10/2012.

bmc nephrology

An open-label phase 2 trial to assess the efficacy, safety and pharmacokinetics of lanthanum carbonate in hyperphosphatemic children and adolescents with chronic kidney disease undergoing dialysis