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HyperphosphataemiaPhase 2NCT02151643

Study to Evaluate the Efficacy and Safety of PT20 in Subjects With Hyperphosphataemia and Dialysis Dependent Chronic Kidney Disease

A Phase 2 study testing PT20 in people with Hyperphosphataemia, run by Phosphate Therapeutics.

Completed

Finished. The study has ended and is not enrolling. Results may be posted on the official record.

Official record
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Trial summary

The main purpose of this study is to see whether PT20 can help people with a high level of phosphate in their blood (called Hyperphosphatemia) that are being treated with dialysis for kidney disease. Read more about this study

Who is it for?
Ages 18 to 90 years
Conditions the study is for
Hyperphosphataemia
What is being tested?
PT20
Type of treatment
Pill or oral medicine
Could I receive a placebo?
Yes, some participants may receive a placebo
How many people
153 participants
Where
No sites listed yet
Study dates
7 May 2014to 18 Mar 2015
Phase
Phase 2
Are there results?
Yes, posted in the registrySummary in the doctors' view

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 18 to 90 years
  • All sexes
  • No healthy volunteers
  • Adult, Older adult

Who may be able to join

  • Men or women aged 18 90 years
  • Subject must have a stable dialysis prescription for at least 28 days prior to start of Screening.
  • Subject must have the most recent serum phosphate measurement, taken during the 28 days prior to the start of Screening, of ≥ 4.0 mg/dL and ≤ 8 mg/dL.

Who cannot join

  • Subject's most recent historical pre-dialysis serum bicarbonate value within 14 days prior to the start of Screening (Visit 1) is < 18 mg/dL.
  • Subject has, in the opinion of the investigator, severe chronic lung disease and/or carbon dioxide retention.

About this study

The main purpose of this study is to see whether PT20 can help people with a high level of phosphate in their blood (called Hyperphosphatemia) that are being treated with dialysis for kidney disease.

Read the detailed description

PT20 represents a mechanism to address many of the limitations associated with current phosphate binding agents. The available clinical and non clinical evidence suggests that PT20 binds phosphate and prevents its uptake more efficiently than other phosphate binding drugs and may therefore either reduce the pill burden associated with controlling phosphate levels, or result in lower phosphate levels with the same pill burden.

The this study is the first to investigate the efficacy and safety of PT20 in subjects with dialysis-dependent chronic kidney disease (CKD).

Being tested
PT20, Placebo
Keywords
Dialysis Dependent Chronic Kidney Disease
Medical subject headings
Hyperphosphatemia

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • PT20Drug

    Also called Iron (III) oxide adipate, ferric oxide adipate, iron (III) oxide hydroxide adipate, M10L78

    Modified ferric oxide adipate tablets

  • PlaceboDrug

    Also called Matched Placebo for PT20

    Placebo tablets matched to each PT20 dose arm

Study groups in NCT02151643
Study groupRoleWhat they receive
Group 1 - PT20 400 mg tidExperimentalPT20 400 mg tid (1.2 g/day) administered orally. Dosing was initiated with the subject's first meal/snack following receipt of study medication at Visit 7 (Day 1). There was to be no change in dose administration level with respect to each cohort in this study
Receives: Drug: PT20
Group 2 - PT20 800 mg tidExperimentalPT20 800 mg tid (2.4 g/day) administered orally. Dosing was initiated with the subject's first meal/snack following receipt of study medication at Visit 7 (Day 1). There was to be no change in dose administration level with respect to each cohort in this study
Receives: Drug: PT20
Group 3 - PT20 1600 mg tidExperimentalPT20 1600 mg tid (4.8 g/day) administered orally. Dosing was initiated with the subject's first meal/snack following receipt of study medication at Visit 7 (Day 1). There was to be no change in dose administration level with respect to each cohort in this study
Receives: Drug: PT20
Group 4 - PT20 3200 mg tidExperimentalPT20 3200 mg tid (9.6 g/day) administered orally. Dosing was initiated with the subject's first meal/snack following receipt of study medication at Visit 7 (Day 1). There was to be no change in dose administration level with respect to each cohort in this study
Receives: Drug: PT20
Group 5 - Placebo tidPlacebo comparatorMatched Placebo (for PT20) tid administered orally. Dosing was initiated with the subject's first meal/snack following receipt of study medication at Visit 7 (Day 1). There was to be no change in dose administration level with respect to each cohort in this study
Receives: Drug: Placebo

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Change in Serum Phosphate Concentration From Baseline (Visit 7, Day 1) to Visit 11 (Day 29)

    The primary efficacy endpoint was the change in serum phosphate concentration from Baseline (Visit 7, Day 1) to Visit 11 (Day 29). All study specific blood samples were collected, processed and analysed using a central laboratory.

    Measured: Day 1 to Day 29

Secondary outcomes (5)
  1. Change in Haemoglobin Concentration From Baseline (Visit 7, Day 1) to Visit 11 (Day 29)

    Descriptive statistics were to be used to summarise values and change from Baseline (Visit 7, Day 1) to Day 29 (Visit 11) in haemoglobin concentration. An analysis of covariance (ANCOVA) was to be used to analyse the changes from Baseline (Visit 7, Day 1) to Visit 11 (Day 29), which were to include the fixed, categorical effects of treatment as well as the continuous, fixed covariates of Baseline concentrations for haemoglobin. Only those subjects with available concentrations for both Baseline (Visit 7, Day 1) and Visit 11 (Day 29) were to be included in this analysis.

    Measured: Day 1 to Day 29

  2. Change in Serum Ferritin Concentration From Baseline (Visit 7, Day 1) to Visit 11 (Day 29)

    Descriptive statistics were to be used to summarise values and change from Baseline (Visit 7, Day 1) to Day 29 (Visit 11) in serum ferritin concentration. An analysis of covariance (ANCOVA) was to be used to analyse the changes from Baseline (Visit 7, Day 1) to Visit 11 (Day 29), which were to include the fixed, categorical effects of treatment and week (Visit), as well as the continuous, fixed covariates of Baseline concentrations for serum ferritin. Only those subjects with available concentrations for both Baseline (Visit 7, Day 1) and Visit 11 (Day 29) were to be included in this analysis.

    Measured: Day 1 to Day 29

  3. Change in Transferrin Saturation From Baseline (Visit 7, Day 1) to Visit 11 (Day 29)

    Descriptive statistics were to be used to summarise values and change from Baseline (Visit 7, Day 1) to Day 29 (Visit 11) in transferrin saturation. An analysis of covariance (ANCOVA) was to be used to analyse the changes from Baseline (Visit 7, Day 1) to Day 29 (Visit 11), which were to include the fixed, categorical effects of treatment and week, as well as the continuous, fixed covariates of Baseline concentrations for transferrin saturation. Only those subjects with available concentrations for both Baseline (Visit 7, Day 1) and Visit 11 (Day 29) were to be included in this analysis.

    Measured: Day 1 to Day 29

  4. Change in Calcium x Phosphate Product From Baseline (Visit 7, Day 1) to Visit 11 (Day 29)

    Descriptive statistics were to be used to summarise values and change from Baseline (Visit 7, Day 1) to Day 29 (Visit 11) in Calcium x Phosphate Product . An analysis of covariance (ANCOVA) was to be used to analyse the changes from Baseline (Visit 7, Day 1) to Day 29 (Visit 11), which were to include the fixed, categorical effects of treatment, as well as the continuous, fixed covariates of Baseline concentrations for Calcium x Phosphate Product. Only those subjects with available concentrations for both Baseline (Visit 7, Day 1) and Visit 11 (Day 29) were to be included in this analysis. In CKD subjects (Stages 3-5), the clinical recommendation (KDOQI) is that serum calcium x phosphate product should be maintained at < 55 mg^2/dL^2 (4.4 mmol^2 /L^2).

    Measured: Day 1 to Day 29

  5. Change in Gastrointestinal Symptom Rating System (GSRS) Overall Score From Baseline (Visit 7, Day 1) to Visit 11 (Day 29)

    The GSRS assesses the impact of treatment-related GI complications. It includes 15 items divided into 5 subscales (diarrhoea, indigestion, abdominal pain, constipation, and reflux), and uses a seven-grade Likert scale to assess symptoms (1 = no discomfort at all, 7 = very severe discomfort). The total score was calculated as the average score of all 15 items. If data were missing from one or more subscales, the mean of the completed items within the subscale was to be used for the subscale score, provided that more than half of the subscale items were complete. If more than half of the items within a subscale were missing, the subscale score and overall score were also to be defined as missing. The change in overall GSRS score from Baseline (Visit 7, Day 1) to Visit 11 (Day 29) was summarised by treatment and a two-sample t-test was to be used to identify differences between the placebo and PT20 dose groups. The higher the score, the more severe the gastrointestinal symptoms.

    Measured: Day 1 to Day 29

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted30 May 2014 (estimated)
  2. Study start7 May 2014
  3. Primary completion18 Mar 2015
  4. Study completion18 Mar 2015

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase 2
Primary purpose
Treatment
Allocation
Randomised
Intervention model
Parallel groups
Masking
Quadruple blind
Who is masked
Participant, Care provider, Investigator, Outcomes assessor
Enrolment
153 participants (actual)
IDs, dates and publications
ClinicalTrials.gov ID
NCT02151643
Sponsor's protocol ID
PT20-201
Status last verified
Dec 2017
First submitted
28 May 2014
Last updated
16 Jan 2018
Data monitoring committee
Yes
FDA-regulated drug
Yes
FDA-regulated device
No
Individual data sharing
No

Publications

  • Natale P, Green SC, Ruospo M, Craig JC, Vecchio M, Elder GJ, Strippoli GF. Phosphate binders for preventing and treating chronic kidney disease-mineral and bone disorder (CKD-MBD). Cochrane Database Syst Rev. 2025 Jun 27;6(6):CD006023. doi: 10.1002/14651858.CD006023.pub4.

    PubMed 40576086
  • Sampson M, Faria N, Powell JJ; PEACH study investigators. Efficacy and safety of PT20, an iron-based phosphate binder, for the treatment of hyperphosphataemia: a randomized, double-blind, placebo-controlled, dose-ranging, Phase IIb study in patients with haemodialysis-dependent chronic kidney disease. Nephrol Dial Transplant. 2021 Jul 23;36(8):1399-1407. doi: 10.1093/ndt/gfaa116.

    PubMed 32651955

Questions about this trial

What is this clinical trial studying?

A Phase 2 study testing PT20 in people with Hyperphosphataemia, run by Phosphate Therapeutics.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 3 inclusion and 2 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: finished, as of the sponsor's last update on 16 Jan 2018. Status can change between updates, so confirm with the study contact before making plans.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. Some participants in this study may receive a placebo. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

What does this phase mean?

Phase 2 studies give the treatment to a larger group to see whether it has the intended effect and to keep checking safety.

Not every study follows the same path, and some studies (observational studies, device studies) have no phase.

Are results available for this study?

Yes. Results are posted in the registry (first posted 16 Jan 2018). A summary is in the For doctors view, and the full results are on ClinicalTrials.gov.

How can a doctor refer a patient or contact the research team?

The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Change in Serum Phosphate Concentration From Baseline (Visit 7, Day 1) to Visit 11 (Day 29) (time frame: Day 1 to Day 29). It is what the study was designed to measure, not a finding.

Where can I read the original study information?

On the ClinicalTrials.gov record for NCT02151643, which also lists 2 linked publications.

Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 16 Jan 2018.

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