#2524 Impact of sevelamer hydrochloride on fibroblast growth factor-23 levels in patients undergoing hemodialysis

Abstract Background and Aims Serum intact fibroblast growth factor 23 (FGF23) levels are progressively increased in relation to the severity of kidney dysfunction. High serum intact FGF23 concentration is associated with the increased cardiovascular morbidity and mortality in patients with chronic kidney disease (CKD). Clinically, phosphate binders are commonly used to reduce serum intact FGF23 levels in CKD patients by lowering serum phosphate levels. Reduction of high intact FGF23 concentration is a strategy, possibly improving the consequences of CKD. We aimed to Assessing the Impact of Sevelamer Carbonate on Fibroblast Growth Factor-23 Levels. Method This case-control study enrolled 100 pre-existing hemodialysis patients, evenly divided into two groups of 50. Group I received a specific sevelamer hydrochloride (Renagel)® dose (2 tablets every 8 hrs), while Group II served as the control group and did not receive (Renagel)®. All patients received the same modality of dialysis with a consistent dialysate calcium concentration. Additionally, they received comprehensive dietary phosphate counseling as part of the standard dietary education provided to our dialysis patients. The levels of phosphorus, calcium, alkaline phosphatase, and FGF23 were assessed in all individuals at the beginning of the study (baseline) and again following 3 months of sevelamer therapy. Results While baseline FGF-23 levels were not statistically different, a highly significant divergence emerged after 3 months of treatment. The sevelamer group experienced a remarkable 38.4% decrease in FGF-23, compared to a mere 0.5% change in the control group, highlighting the pronounced effect of sevelamer on this key protein. Analysis of PO4 levels revealed a remarkable difference between the groups following treatment. While initial PO4 measurements were statistically comparable, the sevelamer group experienced a significantly larger decrease compared to the control group (p 0.001). Both baseline and follow-up FGF-23 levels displayed highly statistically significant positive correlations with PO4, PTH, alkaline phosphatase, and hsCRP. Conclusion This study found that non-calcium-based phosphate binders were associated with a substantial reduction in FGF-23 in hemodialysis patients. This finding suggests that utilizing such binders may offer protection against the adverse effects of high FGF-23 levels, which are prevalent in this population.