PD Study to Assess Phosphate Binding Characteristics of K2CG Chewing Gum

Chronic Kidney Disease Clinical Trial

Official title:

A Single Blind Pharmacodynamic Study to Assess the Phosphate Binding Characteristics of K2CG Chewing Gum

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT01319578
• Other study ID #: CMD 005
• Status: Completed
• Phase: N/A
• First received: March 3, 2011
• Last updated: November 11, 2011
• Start date: July 2011
• Est. completion date: August 2011

Study information

• Verified date: November 2011
• Source: Denver Nephrologists, P.C.
• Contact: n/a
• Is FDA regulated: No
• Health authority: United States: Institutional Review Board
• Study type: Interventional

Clinical Trial Summary

The specific purpose of this study is to describe the characteristics of the K2CG chewing gum, specifically as it relates to duration of gum chewing (exposure), timing of gum chewing in relation to a meal, and dose of K2CG chewing gum.

Description:

Previous studies have demonstrated that salivary phosphate levels are elevated in patients with CKD and that there is a direct and linear correlation between serum phosphorus and salivary phosphorus. K2CG chewing gum may provide an alternative approach to treating patients with elevated phosphate levels. However, data regarding the pharmacodynamic effect of the K2CG chewing gum on salivary phosphorus is lacking; as such, this study seeks to examine the phosphate binding characteristics of K2CG chewing gum with 2 different amounts of chitosan and varying exposure time in the fasting and fed condition.

A precise knowledge of the pharmacodynamic effect of the K2CG chewing gum on salivary phosphorus is expected to provide information necessary to plan and conduct a subsequent interventional trial with K2CG chewing gum in patients with both Chronic Kidney Disease and ESRD. Specifically, quantification of the amount of salivary phosphorus that binds to 3 formulations of chitosan loaded chewing gum (20 mg, 40 mg and 60 mg) with varying exposure times will inform the optimal duration of exposure relative to gum size. The effect of gum size will be further explored via the use of two different sizes of placebo chewing gum (1.7 g and 2.0 g sizes). Additionally it is a specific aim of this study to assess whether chewing gum in the fasted vs. fed state affects the binding characteristics of chitosan loaded chewing gum.

This study is a pharmacodynamic study to characterize the phosphate binding capabilities of three different doses of K2CG chewing gum (20mg, 40mg, 60mg) and one placebo chewing gum (1.7 g). Thirty-six subjects will be enrolled across three renal function group based on estimated glomerular filtration rate.

Study assessments will occur over four study visit days (Visit 2, Visit 3, Visit 4, and Visit 5). Fasting study procedures will occur in the morning of each visit day, and non-fasting procedures will occur following the administration of a standardized meal on the same day. All subjects will receive three doses of K2CG chewing gum and one placebo: 20 mg dose at Visit 2, 1.7 g placebo at Visit 3, 40 mg dose at Visit 4, and 60 mg dose at Visit 5. Subjects will not be aware of the specific gum dose or size at any study visit (single blind). The duration of gum chewing and timing of salivary collections will vary within each group.

Saliva will be collected at specified time points throughout the trial. Fasting salivary phosphorus must be collected with nothing to eat or drink for at least 2 hours.

Recruitment information / eligibility

• Status: Completed
• Enrollment: 36
• Est. completion date: August 2011
• Est. primary completion date: August 2011
• Accepts healthy volunteers: No
• Gender: Both
• Age group: 18 Years and older

Eligibility

Inclusion Criteria:

• Men or women > 18 years of age;

• Must have no dietary restriction that would preclude eating standardized meal (both a meat based and vegan option available)

• The subject has voluntarily signed and dated the most recent informed consent form approved by an Institutional Review Board (IRB).

• Must be able to chew gum for at least 60 minutes.

• Must have historical eGFR appropriate for the study.

Exclusion Criteria:

• Receiving or has received an investigational product (or is currently using an investigational device) within 30 days prior to Visit 2;

• Evidence of active (clinically significant) infection at the time of study enrollment (in the opinion of the investigator);

• Dental work within 48 hours of enrollment (Visit 2); and

• Known sensitivity to chitin, or allergy to shellfish

Study Design

Allocation: Non-Randomized, Endpoint Classification: Pharmacodynamics Study, Intervention Model: Crossover Assignment, Masking: Single Blind (Subject)

Related Conditions & MeSH terms

• Chronic Kidney Disease
• Hyperphosphatemia
• Kidney Diseases
• Renal Insufficiency, Chronic

Intervention

Other:
• K2CG chewing gum
Fasting: Chew gum 15 minutes Post meal: Begin chewing 45 minutes post meal
• K2CG chewing gum
Fasting: Chew gum 30 minutes Post meal: Begin chewing 30 minutes post meal
• K2CG chewing gum
Fasting: Chew gum for 45 minutes Post meal: Begin chewing gum 15 minutes post meal
• K2CG chewing gum
Fasting: Chew gum for 60 minutes Post meal: Being chewing gum 5 minutes post meal

Locations

Country	Name	City	State
United States	Denver Nephrologists, PC	Denver	Colorado

Sponsors (2)

Lead Sponsor	Collaborator
Denver Nephrologists, P.C.	CM&D Pharma Limited

Country where clinical trial is conducted

United States, 

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	total phosphate bound per gum piece fasting	patients will be assigned to treatment arms of varying chewing duration fasting and the total phosphorous bound per piece of chewing gum will be assessed. each patient will recieve (in random order) gum with placebo, 20 mg, 40 mg, and 60 mg chitosan content	15 min, 30 min, 45 min, 60 min post chewing	No
Primary	total phosphate bound per piece of gum post meal	Each subject will begin chewing at the assigned time post meal exposure and chew for 30 minutes. total phosphorus bound per piece of gum will be assessed. each patient will recieve (in random order) gum with placebo, 20 mg, 40 mg, and 60 mg chitosan content	5 min, 15 min, 30 min, 45 minutes post meal	No