Gent for Pharyngeal Gonorrhea (GC)

Study Overview
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Brief Summary
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The Centers for Disease Control and Prevention has identified antimicrobial-resistant (AMR) Neisseria gonorrhoeae (NG) as one of the nation's top three urgent AMR threats. Since the advent of antibiotics in the 1930s, NG has developed resistance to every first-line antibiotic. Parenteral third-generation cephalosporins are now the only class of drug with consistent efficacy against NG. New therapies are urgently needed. Although some novel antimicrobials are under development, reevaluating older drugs is another option for quickly identifying additional treatments for gonorrhea. We propose a demonstration study to test a single dose of gentamicin for the treatment of pharyngeal gonorrhea. We chose to focus on pharyngeal gonorrhea because these infections are common, play an important role in fostering gonococcal resistance, and are harder to eradicate than genital infections. Although gentamicin is 91% efficacious for genital NG, its efficacy at the pharynx may be less since streptomycin, another aminoglycoside previously used to treat gonorrhea, was not effective for pharyngeal NG. It is unknown if streptomycin's poor efficacy is indicative of limitations of aminoglycosides as a class. We plan to enroll 60 men who have sex with men in a demonstration study to be conducted at the Seattle & King County STD Clinic to test the efficacy of 360 mg of gentamicin given intramuscularly for pharyngeal gonorrhea. Secondary objectives include determining the ideal pharmacodynamic criterion (comparing in vitro minimal inhibitory concentrations (MIC) of NG to peak gentamicin serum levels), estimating resistance induction among treatment failures, and assessing the tolerability of 360 mg of IM gentamicin. Objectives The proposed study aims to evaluate the efficacy of a single intramuscular (IM) dose of gentamicin in the treatment of pharyngeal gonorrhea. Secondary objectives include documenting the efficacy stratified by minimal inhibitory concentration (MIC) compared with the gentamicin peak level in order to estimate a pharmacodynamic criterion. We will also attempt to determine whether gentamicin monotherapy induces antimicrobial resistance among treatment failures. Lastly, we will evaluate the tolerability of 360 mg of IM gentamicin, stratified by subject weight (i.e. weight based dosing). The specific aims are: Determine the proportion of persons whose pharyngeal gonococcal infections are cured with a single dose of 360mg gentamicin intramuscularly alone. Evaluate the renal safety and tolerability of 360mg IM of gentamicin. Document mean peak gentamicin levels following 360mg IM of gentamicin stratified by weight. Estimate the best pharmacodynamics criterion (i.e. peak/MIC ratio) for pharyngeal gonorrhea treated with gentamicin using individual and mean peak gentamicin levels and NG isolate MIC. Among treatment failures, conduct exploratory analyses comparing pre- and post-treatment MIC for evidence of induced resistance.

Official Title
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Gentamicin for Pharyngeal Gonorrhea - A Demonstration Study

Conditions
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Pharyngeal Gonococcal Infection

Intervention / Treatment
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* Drug: gentamicin 360mg IM


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Persons diagnosed with pharyngeal gonorrhea who are not yet treated Exclusion Criteria: Age less than 16 years Receipt of antibiotics in ≤30 days Known allergy to any aminoglycoside History of renal disease (including diagnosis of solitary kidney, chronic renal insufficiency, renal cell carcinoma etc), Use of concurrent nephrotoxic drugs or muscle relaxants History of diabetes History of hearing loss or tinnitus Concurrent infection with syphilis or chlamydia Pregnancy and/or nursing Unable to return for a follow-up visit 4-7 days (+/- 1 day). Study team's discretion

Ages Eligible for Study
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Minimum Age: 16 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Intervention Model: Single Group Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Single Arm<br>Men who have sex with men (MSM) with pharyngeal gonorrhea will be treated with 360mg intramuscular gentamicin x 1. | Drug: gentamicin 360mg IM<br>* 360mg IM of gentamicin<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Cure Rate Defined as the Percentage of Persons With Pharyngeal Gonorrhea Treated With Gentamicin 360mg IM Who Have a Negative Culture 4-7 Days Following Treatment | Negative Pharyngeal Culture | 4-7 days (+/- 1 day) after treatment | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Renal Safety | Measured by a percent change in serum creatinine from baseline to test of cure (4-7 days following treatment) | 4-7 days (+/- 1 day) after treatment | 
| Tolerability of the Injection Gentamicin 360mg IM x 1 | Participant reported pain scale, with 1 being little to no pain, and 10 being the worst pain ever. | 4-7 days (+/- 1 day) after treatment | 
| Peak Gentamicin Levels | serum gentamicin concentration | at 30, 45, or 60 minutes post dose | 
| Gentamicin Minimal Inhibitory Concentration (MIC) | laboratory defined MIC of infecting strain of N. gonorrhoeae at enrollment visit determined by agar dilution | baseline/enrollment visit | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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gonorrhea, pharynx, treatment, gentamicin