Evaluation of EVO100 for Prevention of Urogenital Chlamydia Trachomatis and Neisseria Gonorrhoeae Infection (EVOGUARD)
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ClinicalTrials.gov Identifier: NCT04553068 |
Recruitment Status :
Active, not recruiting
First Posted : September 17, 2020
Last Update Posted : June 7, 2022
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Condition or disease | Intervention/treatment | Phase |
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Sexually Transmitted Diseases Gonorrhea Chlamydia | Drug: EVO100 Drug: Placebo | Phase 3 |
Study Type : | Interventional (Clinical Trial) |
Estimated Enrollment : | 1730 participants |
Allocation: | Randomized |
Intervention Model: | Parallel Assignment |
Masking: | Triple (Participant, Care Provider, Investigator) |
Primary Purpose: | Prevention |
Official Title: | Phase 3 Double-blind Placebo-controlled Efficacy Trial of EVO100 Vaginal Gel for the Prevention of Urogenital Chlamydia Trachomatis and Neisseria Gonorrhoeae Infection |
Actual Study Start Date : | October 15, 2020 |
Estimated Primary Completion Date : | July 28, 2022 |
Estimated Study Completion Date : | July 28, 2022 |

Arm | Intervention/treatment |
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Experimental: EVO100 gel
EVO100 vaginal gel, 5 g
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Drug: EVO100
EVO100 vaginal gel |
Placebo Comparator: Placebo gel
Placebo vaginal gel, 5 g
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Drug: Placebo
Placebo vaginal gel |
- Demonstrate the proportion of study successes versus failures in the EVO100 and placebo treatment groups [ Time Frame: 16 weeks ]Proportion of subjects who are defined study successes vs study failures among the intervention groups with success defined as subjects completing the trial to Visit 5 without any CT or GC infection and no usage of prohibited antibiotics during the study.
- Evaluate safety of EVO100: Incidence of AEs [ Time Frame: 16 weeks ]Incidence of AEs (descriptive analysis)

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Ages Eligible for Study: | 18 Years and older (Adult, Older Adult) |
Sexes Eligible for Study: | Female |
Gender Based Eligibility: | Yes |
Gender Eligibility Description: | Females Only |
Accepts Healthy Volunteers: | Yes |
Subject Recruitment: EVOGUARDStudy.com/ct
Inclusion Criteria:
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Subjects must meet both of the following criteria:
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Urogenital CT and/or GC infection (documented in a retrievable medical record) within the 16 weeks prior to enrollment and one or more of the additional risk factors included below:
- 18 to 24 years of age at the screening visit
- New sex partner within the past 12 weeks (84 days)
- More than one current sex partner
- Knowledge that current sex partner has multiple partners
- Partner with known sexually transmitted infection (STI)
- Inconsistent condom use among persons who are not in a mutually monogamous relationship
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After three unsuccessful documented attempts to obtain medical records, the subject has a self-reported history of infection less than 17 weeks prior to enrollment AND two or more of the following additional risk factors:
- 18 to 24 years of age at the screening visit
- New sex partner within the past 12 weeks (84 days)
- More than one current sex partner
- Knowledge that current sex partner has multiple partners
- Partner with known STI
- Inconsistent condom use among persons who are not in a mutually monogamous relationship
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- Ability to understand the consent process and procedures. For minors, the ability to obtain consent from parents/legal guardian and assent by minor subjects as applicable according to local regulations.
- Agree to be available for all study visits including Visit 5 and follow-up Visit 6 and comply with follow-up on staff appointment reminders
- Negative pregnancy test
- Negative CT and GC nucleic acid amplification test (NAAT) at screening or positive CT or GC NAAT and receives standard of care (SOC according to CDC or World Health Organization [WHO] guidelines) treatment prior to enrollment with subsequent negative CT and GC NAAT testing at enrollment visit
- Agree to use a woman-controlled method of contraception that is not directly delivered to the vaginal mucosa (with the exception of a vaginal ring) throughout the duration of the study, such as oral contraceptives, birth control implants, intrauterine devices (IUDs), or tubal ligation. Condom use only is not an acceptable form of contraception for this study
- Able and willing to comply with all study procedures, including the use of eDiaries and reporting of all Adverse Events and concomitant medications.
- Reports vaginal sexual intercourse with a male partner at least three times per month in the previous month and anticipates vaginal sexual intercourse regularly for the duration of the study
- Agree to abstain from douching or any form of vaginal suppository use (other than investigational product) during course of study
Exclusion Criteria:
- In the opinion of the Investigator, has a history of substance or alcohol abuse in the last 12 months or, has issues, conditions, or concerns that may compromise the safety of the subject, impact the subject's compliance with the protocol requirements, or confound the reliability of the data acquired
- Women who have undergone a total hysterectomy (had uterus and cervix removed). However, women with subtotal hysterectomy with an intact cervix may be enrolled
- Has a history or expectation of noncompliance with medications or intervention protocol
- Has engaged in sexual vaginal intercourse or douching, or used of any form of vaginal suppository or intravaginal device (with the exception of contraceptive vaginal ring or tampons) for 24 hours prior to enrollment (may be enrolled at a later date if all other criteria are met)
- Menstruating at enrollment (may be enrolled at a later date if all other criteria are met)
- Is currently being treated, or has been treated, for a period of 21 days prior to enrollment, with any prohibited antibiotics. The prohibited antibiotics include azithromycin, erythromycin, doxycycline, levofloxacin, ofloxacin, ceftriaxone, and cefixime.
- In the opinion of the Investigator, has signs/symptoms that indicate persistence of CT or GC infection diagnosed at screening, new interval infection, and/or a failure to comply with or complete the prescribed treatment regimen following a positive screening NAAT

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.
Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT04553068

Study Director: | Catherine Maher, PhD | Evofem Inc. |
Publications automatically indexed to this study by ClinicalTrials.gov Identifier (NCT Number):
Responsible Party: | Evofem Inc. |
ClinicalTrials.gov Identifier: | NCT04553068 |
Other Study ID Numbers: |
EVO100-311 |
First Posted: | September 17, 2020 Key Record Dates |
Last Update Posted: | June 7, 2022 |
Last Verified: | April 2022 |
Studies a U.S. FDA-regulated Drug Product: | Yes |
Studies a U.S. FDA-regulated Device Product: | No |
Chlamydia Infections Sexually Transmitted Diseases Gonorrhea Infections Chlamydiaceae Infections Gram-Negative Bacterial Infections Bacterial Infections Bacterial Infections and Mycoses |
Sexually Transmitted Diseases, Bacterial Communicable Diseases Genital Diseases Urogenital Diseases Disease Attributes Pathologic Processes Neisseriaceae Infections |