A Study to Evaluate the Microbiology, Safety and Tolerability of C16G2 Dental Strip Application

Phase 2

Completed

• Conditions: Dental Caries
• Interventions: Other: Placebo Strip; Drug: C16G2 Strip

• Registration Number: NCT03052842
• Lead Sponsor: Armata Pharmaceuticals, Inc.

Brief Summary

Single-blind study to evaluate whether C16G2 Strip administered in multiple doses can effectively kill the bacteria in the oral cavity that cause dental caries..

Detailed Description

A single-blind, randomized, placebo-controlled, phase 2 study to evaluate oral microbiology and safety of multiple C16G2 Strip applications in male and female dental subjects 12-75 years of age.

The study will compare multiple study drug administrations of 9.2 mg, 18.4 mg, and 36.8 mg C16G2 Strip or Placebo in Study Arms 1 through 3, respectively. Enrollment of subjects in Study Arms 1 through 3 will occur sequentially in an ascending dose-escalation manner. Before dosing of study drug, eligible subjects will receive professional dental prophylaxis between Days -7 and -2. Subjects will receive 11 doses administered over approximately two weeks. Each subject will receive a single dose on Day 0, followed by 5 days of AM and PM dosing starting on Day 7. To evaluate the durability of S. mutans suppression, study subjects will be followed for microbiology for up to 1 month after the last study drug administration.

Clinic visits include Visit 1 (Screening/Days -30 to -1), Visit 2 (Prophylaxis/Day -7 to -2), Eligibility Confirmation \& Baseline Visit 3, Follow-up Visits 4-7 (Safety and Microbiology), Visits 8-17 (Study Drug Administration), Follow-up Visits 18-20 (Safety and Microbiology) and Follow-up Visits 21-22 (Microbiology only).

Basic Information
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Recruitment & Eligibility
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Study & Design
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Trial Locations

Study Timeline

• Study Start: 2017-02-09
• Study First Submitted: 2017-02-10
• Study First Submitted QC: 2017-02-10
• Study First Posted: 2017-02-14
• Primary Completion: 2017-04-05
• Study Completion: 2017-04-05
• Disposition First Submitted: 2018-07-27
• Results First Submitted: 2022-06-22
• Status Verified: 2022-12
• Results First Submitted QC: 2022-12-09
• Disposition First Submitted QC: 2022-12-09
• Last Update Submitted: 2022-12-09
• Results First Posted: 2022-12-22
• Disposition First Posted: 2022-12-22
• Last Update Posted: 2022-12-22

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 30

Inclusion Criteria

1. Males and females, 12-75 years of age
2. Adults subjects provide written informed consent and adolescent subjects give written or verbal assent, as appropriate, and parent(s) or legal guardian(s) give written informed consent
3. Female subjects of childbearing potential must agree to use one of the following forms of contraception from screening through the last study visit: hormonal (oral, implant, or injection) begun >30 days prior to screening; barrier (condom, diaphragm, or cervical cap with spermicide); intrauterine device (IUD). Acceptable contraceptive options may also include abstinence, relationship with a same sex partner or partner who has had a vasectomy at least six (6) months prior to the screening visit
4. Negative urine pregnancy test in all females of childbearing potential (past menarche)
5. Male subjects of sexual activity age: willing to use contraception or abstain from sexual activity beginning with the first exposure to study drug and continuing until discharged from the study due to completion or Early Termination
6. Healthy, as determined by the Investigator (in consultation with the Medical Monitor, as needed), based on medical and dental history, concurrent illnesses, laboratory results, concomitant medications, oral cavity assessment, and targeted physical examination (general, extraoral, head and neck) during Screening Note: Subjects on a stable dose of medication may be eligible for screening and will be assessed by the medical monitor on a case-by-case basis.
7. Have a minimum of 12 bicuspids and molars with a minimum of 8 molars and bicuspids NOT having restorations, crowns or sealants
8. Demonstrated ability to expectorate ≥2 mL of stimulated saliva in 5 minutes
9. Have a salivary S. mutans of 1.0 x 10^5 CFUs/mL or greater at Screening using mitis salivarius-bacitracin (MSB) agar plating
10. Willing to refrain from using non-study dentifrice and other non-study oral care products (oral care rinses, fluoride products, etc.) during the study
11. Willing to postpone elective dental procedures (e.g., dental cleanings) between Screening and final post-treatment visit (End of Study or Early Termination)
12. Willing and able to comply with oral hygiene and diet instructions
13. Able to communicate with the Investigator/study center personnel, understand and comply with the study requirements, and willing to return for protocol-specified visits at the appointed times

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Exclusion Criteria

1. Advanced periodontal disease
2. Active caries lesion(s) within 30 days prior to study drug administration (confirmed by comprehensive caries examination including standard radiographs). Subjects presenting with insipient, non-cavitated lesion(s) are not excluded Note: If radiographs are deemed appropriate for the study and taken within 6 months prior to the Screening visit, these may be used for determining eligibility and are not required to be repeated at Screening
3. Partially erupted teeth where the entire crown is not erupted or an operculum is present
4. Medical condition (e.g., artificial heart valve, history of infective endocarditis, cardiac transplant with valvular dysfunction, congenital heart disease or total joint replacement) for which antibiotics are recommended prior to dental visits and/or procedures
5. Pathologic lesions of the oral cavity (suspicious or confirmed)
6. Full dentures or permanent orthodontic appliances, e.g., braces, buccal or lingual brackets.
7. Use of systemic antibiotics, topical oral antibiotics, or use of other drugs, which in the opinion of the Investigator could influence the study outcome, beginning 30 days prior to Screening until the end of study participation
8. Medical history indicating the woman is pregnant, breastfeeding/lactating or has a positive urine pregnancy test
9. Participation in a clinical trial or receipt of a non-FDA approved therapy within 30 days prior to study drug administration (depending on the specifics, participation in an observational study is not necessarily excluded)
10. Presence of any condition or concurrent illness, which in the opinion of the Investigator, would compromise normal immune function (e.g., diabetes, rheumatoid arthritis, lupus, liver disease, organ transplant, etc.), interfere with the use of study dentifrice and oral care products, or interfere with the ability to comply with study requirements, or jeopardize the safety of the subject or the validity of the study results

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Study & Design

• Study Type: INTERVENTIONAL
• Study Design: SEQUENTIAL

Arm && Interventions

Group	Intervention	Description
Arm 1B: 9.2 mg Placebo	Placebo Strip	Study subjects will be randomized to receive 9.2 mg C16G2 Strip or Placebo in a 4:1 allocation ratio (8 C16G2 Strip subjects: 2 Placebo Strip subjects). Study arm will be fully enrolled (i.e., the last subject in an arm has completed Visit 3) before enrollment is initiated in the next study arm.
Arm 2A: 18.4 mg C16G2	C16G2 Strip	Study subjects will be randomized to receive 18.4 mg C16G2 Strip or Placebo in a 4:1 allocation ratio (8 C16G2 Strip subjects: 2 Placebo Strip subjects). Study arm will be fully enrolled (i.e., the last subject in an arm has completed Visit 3) before enrollment is initiated in the next study arm.
Arm 2B: 18.4 mg Placebo	Placebo Strip	Study subjects will be randomized to receive 18.4 mg C16G2 Strip or Placebo in a 4:1 allocation ratio (8 C16G2 Strip subjects: 2 Placebo Strip subjects). Study arm will be fully enrolled (i.e., the last subject in an arm has completed Visit 3) before enrollment is initiated in the next study arm.
Arm 3A: 36.8 mg C16G2	C16G2 Strip	Study subjects will be randomized to receive 36.8 mg C16G2 Strip or Placebo in a 4:1 allocation ratio (8 C16G2 Strip subjects: 2 Placebo Strip subjects).
Arm 3B: 36.8 mg Placebo	Placebo Strip	Study subjects will be randomized to receive 36.8 mg C16G2 Strip or Placebo in a 4:1 allocation ratio (8 C16G2 Strip subjects: 2 Placebo Strip subjects).
Arm 1A: 9.2 mg C16G2	C16G2 Strip	Study subjects will be randomized to receive 9.2 mg C16G2 Strip or Placebo in a 4:1 allocation ratio (8 C16G2 Strip subjects: 2 Placebo Strip subjects). Study arm will be fully enrolled (i.e., the last subject in an arm has completed Visit 3) before enrollment is initiated in the next study arm.

Primary Outcome Measures

Name	Time	Method
Antimicrobial Activity of C16G2	Measured up to 1 months post last study drug administration	To assess the targeted antimicrobial activity of C16G2 applications as measured by a reduction in Streptococcus mutans in saliva and dental plaque using S. mutans CFUs using mitis-salivarius bacitrain (MSB) agar plating. Streptococcus species present in the oral cavity have been traditionally isolated from oral cavity samples using MSB agar plates. The antimicrobial activity of crystal violet dye, high sucrose content, sodium tellurite and bacitracin effectively prevent the growth of all bacteria except for streptococci. Further differentiation of streptococci is accomplished by observing colony morphology. S. mutans grows in large blue colonies with dry frosted tops or pale blue gumdrops and can be differentiated from other bacterial colonies.
Total Oral Bacterial Levels	Measured up to 1 months post last study drug administration	To assess total bacteria in saliva and dental plaque post study drug administration using total bacteria CFUs using Todd Hewitt (TH) agar plating and the log transformed changes from baseline Total Bacteria levels in dental plaque and saliva including N, mean, SD, median and range at each assessment time point following the first administration of C16G2.

Secondary Outcome Measures

Name	Time	Method
To Evaluate the Safety and Tolerability of Multiple C16G2	Up to 1 week post last study drug administration	Safety will be assessed by performing targeted physical examinations, oral cavity exams, taking vital signs and collection of adverse events categorized according to system organ class (SOC) and preferred term (PT) based on coding to the Medical Dictionary for Regulatory Activities (MedDRA®), Version 17.1. Comprehensive examinations of oral hard and soft tissue structures, as well as targeted exams of specific musculoskeletal and extraoral sites were performed at selected time points; vital signs (blood pressure, heart rate and temperature) were taken.

Trial Locations

Locations (3)

Jacqueline Kleven, DDS; 🇺🇸 Bedford, Texas, United States

John F. Pittaway, DMD; 🇺🇸 Kalispell, Montana, United States

Anthony Henegar, DDS, PA; 🇺🇸 Irving, Texas, United States