NaPi-2b x SLC20A1 x SLC20A2 x P-gp

The goal of this clinical trial is to learn about the following questions in the patients receiving maintenance hemodialysis with elevated blood phosphorus:
How much effect AP-306 has assessed by blood phosphorus lowering;
How safe and tolerable AP-306 is.
Participants will receive either following treatments:
AP-306, and
Sevelamer carbonate.

本研究的主要疗效目的是根据以下终点评价 AP-306 的有效性：在接受维持性血液透析的高磷血症患者中探索 AP-306 降低血清磷水平的能力；安全性目的是评价AP-306的总体安全性和耐受性。

This study is a randomized study designed as a 2x2 cross-over in two periods (Period 1 and Period 2) to assess the safety, pharmacokinetics (PK), pharmacodynamics (PD), and efficacy of EOS789 in patients with chronic kidney disease (CKD) and hyperphosphatemia receiving hemodialysis. Period 1 is double-blind and Period 2 is open-label. Period 1 and Period 2 are identical with regard to the design, inclusion/exclusion criteria, and assessments. EOS789 and its combination with sevelamer carbonate are tested in Period 1 and Period 2 respectively.