An Exploratory Rectal Safety Study of Three Tenofovir Gel Formulations

HIV Prevention Clinical Trial

Official title:

An Exploratory, Double-Blinded, Randomized, Pharmacokinetic and Safety Study of Three Rectally-Applied Tenofovir 1% Microbicide Gel Formulations

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT01575418
• Other study ID #: CHARM-02
• Secondary ID: 5U19AI082637
• Status: Completed
• Phase: Phase 1
• First received: March 1, 2012
• Last updated: May 6, 2014
• Start date: March 2013
• Est. completion date: November 2013

Study information

• Verified date: May 2014
• Source: University of Pittsburgh
• Contact: n/a
• Is FDA regulated: No
• Health authority: United States: Food and Drug AdministrationUnited States: Federal Government
• Study type: Interventional

Clinical Trial Summary

This is a double-blinded, randomized, pharmacokinetic and safety study of 3 rectally applied tenofovir microbicide formulations: a vaginal formulation (VF), a reduced glycerin vaginal formulation (RGVF), and a rectal-specific formulation (RF). Nine HIV-negative men will be enrolled.

Each participant will receive two inpatient doses of each radiolabeled study product. The first inpatient dose of each product will be administered without coital dynamics simulation (CDS), while the second inpatient dose will be followed by a CDS procedure at 1-hour post dose with instillation of radiolabeled autologous semen. There will be a washout period of at least 11 days between each dose.

Recruitment information / eligibility

• Status: Completed
• Enrollment: 9
• Est. completion date: November 2013
• Est. primary completion date: November 2013
• Accepts healthy volunteers: Accepts Healthy Volunteers
• Gender: Male
• Age group: 18 Years and older

Eligibility

Inclusion Criteria:

1. = Age of 18 at screening

2. Willing and able to communicate in English

3. Willing and able to provide written informed consent to take part in the study

4. Willing and able to provide adequate locator information

5. Understands and agrees to local STI reporting requirements

6. Biologically male

7. HIV-1 uninfected at screening according to the standard DAIDS algorithm 8. Willingness to provide semen sample on multiple occasions

9. Per participant report at screening, a history of consensual RAI at least once within the six months prior to screening 10. Willingness to perform simulated RAI with CDS device

11. Willing to abstain from RAI or any practices which include rectal insertion of any product including those used during sexual intercourse (sex toys) for 48 hours before and after inpatient dosing and willing to refrain from ejaculation for a period of 48 hours prior to each semen collection 12. Must agree to use condoms for the duration of the study

13. Must be in general good health 14. Must agree not to participate in other drug trials

15. Availability to return for all study visits, barring unforeseen circumstances

Exclusion Criteria:

1. Significant colorectal symptom(s) as determined by medical history or by participant self-report (including but not limited to presence of any unresolved injury, infectious or inflammatory condition of the local mucosa, history of inflammatory bowel disease, presence of symptomatic external hemorrhoids, and presence of any painful anorectal conditions that would be tender to manipulation.)

2. At screening: participant-reported symptoms and/or clinical or laboratory diagnosis of active rectal or reproductive tract infection requiring treatment per current CDC guidelines or symptomatic urinary tract infection (UTI). Infections requiring treatment include Chlamydia (CT), gonorrhea (GC), syphilis, active HSV lesions, chancroid, genital sores or ulcers, and, if clinically indicated, genital warts. Note that HSV seropositivity with no active genital lesions is not an exclusion criterion, since treatment is not required. (Note: Allow one re-screening after documented treatment (30 days) in cases where urethral GC/CT identified at screening)

3. At screening:

• Positive for hepatitis B surface antigen

• Calculated creatinine clearance less than 60 mL/min by the Cockcroft-Gault formula where creatinine clearance in mL/min = (140 - age in years) x (weight in kg) x (1 for male)/72 x (serum creatinine in mg/dL)

• Alanine transaminase (ALT) and/or aspartate aminotransferase (AST) > 2.5× the site laboratory ULN

4. Known allergic reaction to methylparaben, propylparaben, sorbic acid, glycerin, glycerol, tenofovir, or other components of the test articles

5. Known HIV-infected partners

6. By participant report at enrollment, history of excessive daily alcohol use (as defined by the CDC as heavy drinking consisting of an average consumption of more than 2 drinks per day for men), frequent binge drinking or illicit drug use that includes any injection drugs, methamphetamines (crystal meth), heroin, or cocaine including crack cocaine, within the past 12 months

7. By participant report, use of any rectally-administered medications, rectally administered products containing N-9 (including condoms), any investigational products, and/or systemic immunomodulatory medications within the 4 weeks prior to the first inpatient visit and throughout study participation

8. History of recurrent urticaria

9. Participants whose whole body (EDE) radiation exposure, per the investigator's records and/or participant report, exceeds 5000mrem/year

10. Any other condition or prior therapy that, in the opinion of the investigator, would preclude informed consent, make study participation unsafe, make the individual unsuitable for the study or unable to comply with the study requirements. Such conditions may include, but are not limited to, current or recent history of severe, progressive, or uncontrolled substance abuse, or renal, hepatic, hematological, gastrointestinal, endocrine, pulmonary, neurological, or cerebral disease.

Study Design

Allocation: Randomized, Intervention Model: Crossover Assignment, Masking: Double Blind (Subject, Caregiver, Investigator), Primary Purpose: Prevention

Related Conditions & MeSH terms

• HIV Prevention

Intervention

Drug:
• Rectal formulation (RF) of tenofovir 1% gel
The RF is translucent colorless viscous gel formulation containing 1% (w/w) of tenofovir (PMPA) formulated in purified water with EDTA, glycerin, methylparaben, propylparaben, carbopol, sodium carboxy methyl cellulose, and pH adjusted to 7. The RF is close to isoosmolar with an osmolality of 479 mOsmol/kg.
• Vaginal formulation (VF) of tenofovir 1% gel
The original VF is a transparent, viscous gel formulation containing 1% (weight/ weight or w/w) of tenofovir (PMPA, 9-[(R)-2-(phosphonomethoxy)propyl]adenine monohydrate), formulated in purified water with edetate disodium, citric acid, glycerin, methylparaben, propylparaben, hydroxyethylcellulose, and pH adjusted to 4-5. This formulation has been used in all clinical trials (vaginal, penile, and rectal) of tenofovir 1% gel to date.
• Reduced glycerin vaginal formulation (RGVF) of tenofovir 1% gel
Modified slightly from the original VF formulation, the RGVF has a lower glycerin content than the VF and a significantly reduced osmolality (836 or 846 versus 3111 mOsmol/kg). Lowering glycerin content lowered the viscosity, so the HEC concentration was increased by 10% (a change considered to be insignificant). The amount of parabens was increased by 10% each to improve the antimicrobical effectiveness. The RGVF formulation with 2.75% HEC was used in MTN-007 (CONRAD IND 73,382; currently enrolling), which is the only clinical study of this formulation. The RGVF formulation has since been modified to increase the viscosity.

Radiation:
• Radiolabeling of study drugs and semen
Study products (i.e. the gel formulations) will be radiolabeled with 111In-DTPA, an FDA-approved radiopharmaceutical commonly used in diagnostic nuclear medicine studies. The delivered dose per gel study product will be approximately 100 microCuries (µCi) to allow sufficient visualization for the imaging period. Autologous whole semen collected from the participants at designated visits will be radiolabeled with a delivered dose of approximately 500 microCuries (µCi) of 99mTc-sulfur colloid, also an FDA-approved radiopharmaceutical commonly used in diagnostic nuclear studies. The study team at JHU has extensive experience administering these radiopharmaceuticals rectally. Both of these radiopharmaceuticals will be prepared and delivered by a commercial radiopharmacy and mixed by the study investigators with the respective gel and whole semen vehicles. The study product and autologous whole semen will be loaded into calibrated syringes with luer lock adapter for dosing.

Locations

Country	Name	City	State
United States	Johns Hopkins University, Division of Clinical Pharmacology, Drug Development Unit	Baltimore	Maryland

Sponsors (3)

Lead Sponsor	Collaborator
Ian McGowan	CONRAD, National Institute of Allergy and Infectious Diseases (NIAID)

Country where clinical trial is conducted

United States, 

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Occurrence of adverse events and/or abnormal laboratory values Grade 2 or higher	Grade 2 or higher clinical and laboratory adverse events as defined by the Division of AIDS Table for Grading the Severity of Adult and Pediatric Adverse Events, Version 1.0, Dec 2004 and Addendum 3 (Rectal Grading Tables for Use in Microbicide Studies) will be used to assess safety.	Participants will be followed for the duration of study, an expected average of 12 weeks	Yes
Secondary	Area Under Curve (AUC)	Pharmacokinetics (PK) measures will be evaluated as plasma tenofovir concentrations; Distribution/migration of product and whole semen (with and without Coital Dynamic Simulation or CDS) will be evaluated based on: Distribution of product radiolabel (111Indium DTPA) within the colonic lumen; Distribution of whole semen radiolabel (99mTc-sulfur colloid) within the colonic lumen; And mucosal permeability (with and without CDS) will be measured via: PK in blood of product radiolabel (111Indium DTPA); Urine	0.25hr, 0.5hr, 0.75hr, 1hr, 1.25hr, 1.5hr, 1.75hr, 2hr, 2.33hr, 2.66hr, 3hr, 3.5hr, 4hr, 8hr, 16hr, and 24hr post-dose at Visits 2,4,5,7,8, and 10	No