Lubricant in Men to Inhibit Transmission of HPV
“Lubricant Investigation in Men to Inhibit Transmission of HPV Infection”
The LIMIT-Study is a placebo-controlled, double-blinded randomized controlled trial designed to explore the efficacy of a carrageenan-based lubricant as a topical microbicide for preventing HPV acquisition. Individuals at high risk for infection (men who have sex with men, or MSM, and especially those with HIV) will be included in the trial. Participants will complete a self-administered baseline questionnaire during the enrolment visit, and follow-up questionnaires during all other six visits. The shorter follow-up questionnaires are intended to evaluate recent sexual behaviours and to corroborate the responses given during the baseline visit. These questionnaires will measure HPV risk factors, compliance, and monitor safety and tolerability of the gels. Between follow-up visits, participants will be asked to log into a secure web module at least once a week to answer questions on daily sexual activities, condom and study gel use, and adverse evens. Individuals will be screened for eligibility over the telephone or in person and eligible men will attend an enrolment visit, where the nurse will obtain informed consent and instruct the participant on gel use. They will receive a one month's supply of gel and provide the first specimen. Random number sets will be assigned to the treatment and control gel. Each participant will be assigned an individual code, which will be used to match him to the study arm. Lastly, the nurse will provide details about HPV infection and advice about condom use and sexual health. HPV infection status will be measured using anal specimens at baseline (enrolment/time 0), and at all follow-up clinic visits (1, 2, 3, 6, 9 and 12 months).
Carrageenan is a non-toxic gelling agent safe in animals and humans as a potent HPV inhibitor. An anionic polymer derived from red algae, carrageenan has a long history of human use as a stabilizer and emulsifier in many industries. All three major classes of carrageenan act as extremely potent HPV inhibitors and block HPV infection by binding to the viral capsid, thus preventing attachment to the appropriate cell-surface heparan sulfate proteoglycans (HSPG) receptors.
A gel not containing carrageenan
A Randomized Controlled Trial of a Carrageenan-Containing Lubricant to Reduce Transmission of Human Papillomavirus Infection Among Men Who Have Sex With Men