A Study to Compare Three Different Formulations of Tenofovir 1% Gel When Administered Rectally

Completed · Phase 1 · Has a placebo group

Conditions studied: HIV Prevention

In brief

This is a double-blinded, randomized, safety, acceptability, pharmacokinetic, and ex vivo efficacy study of three rectally-applied tenofovir-based microbicide formulations. Approximately 18 total evaluable HIV-negative men and women (\~9 per site) will be enrolled across two study sites: University of California at Los Angeles (UCLA) and Magee-Womens Research Institute (MWRI) at University of Pittsburgh. Each participant will experience seven rectal exposures to the rectal-specific formulation (RF) and seven rectal exposures to the reduced glycerin vaginal formulation (RGVF) of tenofovir 1% gel, but only one exposure to the vaginal formulation (VF), which will be coupled with six preceding exposures to the Universal HEC Placebo Gel to balance out the VF study stage. Participant accrual will take approximately 6 months and each participant will be on study for approximately 3 months. The total duration of the study will be approximately 1 year. The primary objectives of the study are safety, acceptability, and pharmacokinetics, specifically: * To evaluate the safety of each tenofovir-based microbicide gel formulation when applied rectally * To evaluate the acceptability of each tenofovir-based microbicide gel formulation when applied rectally * To compare systemic and compartment pharmacokinetics among the three tenofovir-based microbicide gel formulations when applied rectally Secondary objective of the study is to evaluate the mucosal immunotoxicity of each tenofovir-based microbicide gel formulation when applied rectally. And the exploratory objective of the study is to assess the preliminary (ex vivo) efficacy of each tenofovir-based microbicide gel formulation using biopsy explants after each product is applied rectally.

Key facts

Study ID: NCT01575405
Run by: Ian McGowan
People needed: 13
Starts: 2013-03-01
Expected to finish: 2013-11-01
Last updated by the study team: 2013-11-07

Who can join

Age: 18 and older. Sex: any. Healthy volunteers: accepted.

You may qualify if…

≥ Age of 18 at screening
Willing and able to communicate in English
Willing and able to provide written informed consent to take part in the study
Willing and able to provide adequate locator information
Understands and agrees to local sexually transmitted infection (STI) reporting requirements
HIV-1 uninfected at screening according to the standard DAIDS algorithm in Appendix II
Must have been vaccinated for or have natural immunity to Hepatitis B, which will be verified by a positive Hepatitis B surface antibody (HBsAb) test at screening (Note: One re-screen will be allowed for individuals who are non immune to Hepatitis B but undergo vaccination.)
Availability to return for all study visits, barring unforeseen circumstances
Willing to abstain from RAI and practices involving insertion of anything in rectum (drug, enema, penis, or sex toy) for 72 hours before and 72 hours after each flexible sigmoidoscopy and study product exposure.
Must agree to use study provided condoms for the duration of the study
Must be in general good health
Must agree not to participate in other concurrent interventional and/or drug trials
Per participant report at screening, a history of consensual RAI at least once in the last three months.
In addition to the criteria listed above, female participants must meet the following criteria:
Willing to abstain from insertion of anything into vagina (drug, douche, penis, or sex toy) other than the swabs/sponges for study related specimen collection for 24 hours before and after each study product exposure
Post-menopausal or using (or willing to use) an acceptable form of contraception (e.g., intrauterine device (IUD), hormonal contraception, surgical sterilization, or vasectomization of male partner). If the female participant has female partners only, the method of contraception will be noted as a barrier method in the study documentation. Temporary abstinence due to absence of partner(s) for the duration of the study will be acceptable.

You may not qualify if…

Abnormalities of the colorectal mucosa, or significant colorectal symptom(s), which in the opinion of the clinician represents a contraindication to biopsy (including but not limited to presence of any unresolved injury, infectious or inflammatory condition of the local mucosa, and presence of symptomatic external hemorrhoids).
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 symptomatic bacterial vaginosis, symptomatic vaginal candidiasis, other vaginitis, trichomoniasis, Chlamydia (CT), gonorrhea (GC), syphilis, active HSV lesions, chancroid, pelvic inflammatory disease, genital sores or ulcers, cervicitis, or symptomatic genital warts requiring treatment. Note that an HSV-1 or HSV-2 seropositive diagnosis with no active lesions is allowed, since treatment is not required. (Note: In cases of non-anorectal GC/CT identified at screening, one re-screening 2 months after screening visit will be allowed.)
Per participant report and/or clinical or laboratory diagnosis, anorectal STI within six months prior to the Screening Visit
At screening:
Hemoglobin < 10.0 g/dL
Platelet count less than 100,000/mm3
White blood cell count < 2,000 cells/mm3 or > 15,000 cells/mm3
For females: 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 (0.85 for female)/72 x (serum creatinine in mg/dL)
For males: 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)
Serum creatinine > 1.3× the site laboratory upper limit of normal (ULN)
Alanine transaminase (ALT) and/or aspartate aminotransferase (AST) > 2.5× the site laboratory ULN
+1 glucose or +1 protein on urinalysis (UA)
History of bleeding problems (verified via prothrombin time (PT)/ International Normalized Ratio (INR) test)
Positive for Hepatitis B surface antigen (HBsAg)
History of significant gastrointestinal bleeding in the opinion of the investigator
Known allergic reaction to methylparaben, propylparaben, sorbic acid, glycerin, glycerol, or tenofovir
Current known HIV-infected partner(s)
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, and more than 1 drink per day for women), 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
Per participant report at screening, anticipated use and/or unwillingness to abstain from the following medications during the period of study participation:
Heparin, including Lovenox®
Warfarin
Plavix® (clopidogrel bisulfate)
Rectally administered medications (including over-the-counter products)
Acyclovir, valacyclovir, famciclovir, and TDF
>81 mg of aspirin per day AND unwillingness and/or inability to completely stop all use of aspirin or aspirin-containing medications for 3 days before and 3 days after the biopsy collection procedure

Where it is running

UCLA Center for Prevention Research — Los Angeles, California, United States
Magee/University of Pittsburgh — Pittsburgh, Pennsylvania, United States

Full record on ClinicalTrials.gov

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