Dose Finding Study to Treat High Phosphate Levels in the Blood.

Study Overview
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Brief Summary
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Randomized. double blind, placebo controlled, parallel arms dose finding study with a 4 weeks treatment period

Detailed Description
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The study consists of a screening period of approximately 1 week, a wash out period of up to 3 weeks, where existing phosphate lowering medication is withheld, a 4-week treatment period and a follow-up period of up to 2 weeks, during which patients are put back on their pre washout phosphate lowering medication. The wash out period will be either 1 week, 2 weeks or 3 weeks depending on the increase in s-phosphate levels. There are 7 parallel treatment arms in the study with bid and od treatment regimens. Laboratory efficacy endpoints and safety assessments will be evaluated at various times throughout the study. The target population of the study is: male or female patients, above18 years of age with End Stage Renal Disease (ESRD) on chronic maintenance hemodialysis (HD) 3 times a week for a minimum of 3 months.

Official Title
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A Phase 2b, Randomized, Double Blind, Placebo-controlled, Parallel Group, Multicentre Dose Finding Study to Evaluate the Efficacy, Safety and Tolerability of AZD1722 to Treat Hyperphosphatemia in End-Stage Renal Disease Patients on Hemodialysis (ESRD-HD)

Conditions
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Hyperphosphatemia

Intervention / Treatment
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* Drug: AZD1722
* Drug: Placebo


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Females and males aged ≥18 years Chronic maintenance hemodialysis 3 x/week for a at least 3 months Prescribed and taking at least 3 doses of phosphate binder per day Serum phosphate levels should be between 3.5 and 8.0 mg/dL ; 1.13 mmol/L and 2.58 mmol/L (inclusive) at screening Total serum calcium levels 2.0 - 2.6 mmol/L inclusive at screening For randomization in the study, after up to 3 weeks wash out of phosphate binders, patients must have serum phosphate levels of at least 6. 0 mg/dL (1.94 mmol/L) but below 10 mg/dL (3.23 mmol/L) and have had an increase of at least 1.5 mg/dL (0.48 mmol/L) vs pre wash out Exclusion Criteria: Severe hyperphosphatemia defined as >10 mg/dL on Phosphate-binders at all time points during clinical routine monitoring for the 3 preceding months before screening visit. Serum parathyroid hormone >1200 pg/mL Significant metabolic acidosis Clinical signs of hypovolemia at randomization -

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 85 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: 1 mg bid<br>1 mg AZD1722 bid | Drug: AZD1722<br>* AZD1722, oral tablet<br>|
| Experimental: 3 mg bid<br>3 mg AZD1722 bid | Drug: AZD1722<br>* AZD1722, oral tablet<br>|
| Experimental: 10 mg bid<br>10 mg AZD1722 bid | Drug: AZD1722<br>* AZD1722, oral tablet<br>|
| Experimental: 30 mg bid<br>30 mg AZD1722 bid | Drug: AZD1722<br>* AZD1722, oral tablet<br>|
| Experimental: 3 mg od<br>3 mg AZD1722 od | Drug: AZD1722<br>* AZD1722, oral tablet<br>|
| Experimental: 30 mg od<br>30 mg AZD1722 od | Drug: AZD1722<br>* AZD1722, oral tablet<br>|
| Placebo Comparator: Placebo<br>Placebo (double dummy technique) | Drug: Placebo<br>* Placebo bid, double dummy technique<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Change in Serum Phosphate Levels | Change in serum phosphate levels from the end of wash out (pre randomization value) to end of treatment | End of wash out (pre randomization value) to end of treatment (Day 29) | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Change From Baseline in Calcium x Phosphorus Product | Change from baseline (end of wash out) in calcium x phosphorus product | End of wash out (pre randomization value) to end of treatment (Day 29) | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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S-phosphate, hyperphosphatemia, hemodialysis, ESRD