New vaginal film uses antibodies to block sperm – first human trial underway
NCT ID NCT07222020
First seen Jun 27, 2026 · Last updated Sep 15, 2026 · Updated 4 times
Summary
This early-stage trial tests whether a vaginal film containing an anti-sperm antibody (KB15A) is safe for healthy women. Twenty-four participants will receive either the active film or a placebo, first as single doses and then daily for 14 days. Researchers will monitor for side effects and measure how much antibody stays in the vagina and enters the bloodstream. The goal is to see if this approach could one day become a new, hormone-free contraceptive.
What this could mean
Our plain-language read of the trial. This is informational only, not medical advice or a prediction.
- Active substance
- KB15A monoclonal antibody vaginal film
- What this could lead to
- If successful, this could lead to a new, non-hormonal contraceptive option that women can use on demand.
- What could go wrong
- This is a very early Phase 1 safety trial with only 24 participants. It is not designed to test whether the film actually prevents pregnancy, and many early-stage ideas never advance.
This is an AI summary of the original study and may miss details. Read our disclaimer.
Study facts
What this study's own registry entry says, in plain language.
- Phase
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Phase 1
The first testing in people. Mainly checks safety and dose, usually in a small group.
- Participants
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About 24 people
The number the study aims to enrol. It can still change while the study runs.
- Started
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Dec 2025
- Expected to finish
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May 2027
An estimate. End dates often move.
- Lead sponsor
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A company
The lead sponsor is a pharmaceutical, biotech, or medical-device company.
Who can take part
This study's own entry requirements. Only the study team can say for certain whether you qualify.
- Ages
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18 to 45 years
- Sex
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Female participants only
- Healthy volunteers
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Accepted
You do not need to have the condition being studied to take part.
Show the full entry requirements Hide the full entry requirements
Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.
Inclusion Criteria: * Age 18 to 45 years, inclusive * General good health (by volunteer history and per investigator judgment) without any clinically significant systemic disease (including, but not limited to significant liver disease/hepatitis, gastrointestinal disease, kidney disease, thyroid disease, osteoporosis or bone disease, and diabetes) and with an intact gastrointestinal tract, uterus and cervix. * History of regular menstrual cycles, by volunteer report, if not taking exogenous hormones * History of Pap smears and follow-up consistent with standard clinical practice as outlined in the Study Manual or willing to undergo a Pap smear at Visit 1 * Willing to give voluntary consent and sign an informed consent form. * Willing to use non-spermicidal, lubricated condoms for any vaginal intercourse according to the study protocol. * Willing to abstain from intercourse and use of intravaginal medications, lubricants, and other products as required in the protocol. * Vaginal and cervical anatomy that, in the opinion of the investigator, lends itself to easy genital tract sample collection. * Must be protected from pregnancy by: * Sterilization of either partner * Heterosexual abstinence * Hormonal contraceptives (except for the contraceptive vaginal ring) * Copper IUD * If in a relationship, must be in a mutually monogamous relationship with a partner who is not known to be HIV positive and has no known risk of sexually transmitted infections (STIs) Exclusion Criteria: * History of hysterectomy * Currently pregnant * Currently breastfeeding or planning to breastfeed during the course of the study * Current Positive test for Trichomonas vaginalis, Neisseria gonorrhea, Chlamydia trachomatis, * Current symptomatic bacterial vaginosis (BV) * Chronic or acute vulvar or vaginal symptoms (pain, irritation, spotting/bleeding, discharge, etc.) * Significant gynecological abnormalities (including abnormal vaginal bleeding, excessive vaginal discharge, or vulvar/vaginal pain or irritation) * Current symptomatic UTI or vaginal candidiasis * History of sensitivity/allergy to KB15A film components, for either the volunteer * Less than 14 days since use of oral or vaginal antibiotics * Women with a history of genital herpes or condylomata who have been symptomatic in the last six months. * Deep epithelial genital findings such as abrasions, ulcerations, and lacerations, or vesicles suspicious for an STI * Known current drug or alcohol abuse which could affect study compliance. * Participation in any other investigational trial within the last 30 days or planned participation in any other investigational trial during the study * History of gynecological procedures (including genital piercing) on the external genitalia, vagina or cervix within the last 14 days * Abnormal finding on laboratory or physical examination or a social or medical condition in the participant, which, in the opinion of the investigator, would make participation in the study unsafe or would complicate interpretation of data. * Grade 2 or higher laboratory abnormality, per the 2014 update of the Division of AIDS, National Institute of Allergy and Infectious Disease (DAIDS) Table for Grading the Severity of Adverse Events, or clinically significant laboratory abnormality as determined by the clinician.
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As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
How to take part
Only the study team decides who joins. These are the ways to reach them.
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The places running it
1 site. The list below names each one and where it is.
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The official record
ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.
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A doctor treating you
A doctor who knows your case can contact a study site on your behalf, and can tell you whether this study is worth pursuing at all.
Contacts and locations
Locations
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Virginia Health Sciences at Old Dominion University
RECRUITINGNorfolk, Virginia, 23507, United States
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