A Study Testing Safety and Efficacy of Transtympanic Paliroden for the Treatment of Cochlear Synaptopathy in Participants With Chronic, Constant Tinnitus (REACT)

September 15, 2026 updated by: Cilcare SAS

A Randomized, Double-Blind, Placebo-Controlled, Single-Dose Phase 1b/2a Clinical Trial to Evaluate The Safety, Tolerability, Pharmacokinetics, and Efficacy of a Transtympanic Injection of Paliroden (CIL001) for the Treatment of Cochlear Synaptopathy in Participants With Chronic, Constant Tinnitus

The goal of this clinical trial is to investigate if paliroden (CIL001) is safe and can help treat cochlear synaptopathy in adult participants 18-75 years of age with normal hearing thresholds and normal cognition who exhibit chronic, constant tinnitus in both ears and have difficulty understanding speech in noisy environments. The main questions it aims to answer are:

  • Is the study drug safe and tolerable over 6 months after injection into the middle ear?
  • How much of the study drug is in the bloodstream at different time points after injection?
  • How effective is a single dose of the study drug at treating cochlear synaptopathy in participants with chronic, constant tinnitus, as measured by hearing and listening tests?

Injection of the study drug will be compared to injection of a placebo (a substance with no study drug in it) to see if there is a difference.

Participants will be screened for eligibility and potentially receive a one-time injection into the middle ear of paliroden or placebo. The study lasts approximately 6 to 7 months if completing the whole study. Based on the visit windows, this could be between 190 and 218 days including a maximum of 42 days for Screening & Run-in and 175 days post-treatment.

Participants will:

  • Visit the clinic for checkups and tests multiple times over the course of the study
  • Complete a large battery of hearing and listening tests, answer questionnaires about their experiences, and provide blood samples for various tests
  • Receive an injection of either the study drug or placebo (a substance that has no active drug in it), if eligible

Study Overview

Status

Not yet recruiting

Conditions

Intervention / Treatment

Study Type

Interventional

Enrollment (Estimated)

60

Phase

  • Phase 2
  • Phase 1

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  1. Native speaker of English
  2. Able and willing to give consent for the study
  3. Age 18-75 years (inclusive) at the time of signing the informed consent
  4. Report binaural, chronic, constant, subjective tinnitus for at least 6 months
  5. Hearing thresholds within normal limits (≤ 20 dB HL at 0.25 to 8 kHz, plus 3 and 6 kHz)
  6. Speech-in-noise deficit (at least 3 dB SNR loss in comparison to normative value of the AE-Matrix test) in both ears
  7. No concurrent tinnitus treatment
  8. Be considered as reliable and capable of adhering to the protocol, according to the judgment of the investigator
  9. Signed informed consent as described in § 11.3 which includes compliance with the requirements and restrictions listed in the informed consent form (ICF) and in this protocol

Exclusion Criteria:

  1. Montreal Cognitive Assessment (MoCA) score < 26
  2. History of somatic/objective tinnitus as defined by AAO-HNS guidelines (e.g., pulsatile/whooshing sounds pulsating in synchrony with heartbeat, or caused by temporo-mandibular joint dysfunction)
  3. Known otologic pathology (e.g., otosclerosis, history of autoimmune hearing loss, radiation-induced hearing loss, fluctuating hearing, endolymphatic hydrops, Ménière's disease, vestibular schwannoma, history of sudden sensorineural hearing loss, Neurofibromatosis Type 2)
  4. History of otologic surgery (apart from tympanostomy tube insertion if more than one year prior to inclusion visit)
  5. Untreated hypothyroidism
  6. Use of prohibited concomitant therapies as described in § 6.10
  7. Current use or history of platinum-based chemotherapy
  8. Concurrent malignancies that require treatment
  9. Abnormal otoscopy as defined by less than 90% of the tympanic membrane visible (e.g., occluding cerumen, ear drum perforation)
  10. Current middle ear pathology (e.g., otitis media, tympanic membrane perforation)
  11. Abnormal tympanogram (other than type A)
  12. Conductive hearing loss (> 10 dB difference between air- and bone-conduction hearing thresholds)
  13. Asymmetric hearing thresholds (more than 15 dB difference between left and right ear) at 0.25 to 8 kHz, plus 3 and 6 kHz
  14. Lactation, known pregnancy, positive pregnancy test at either Screening (urine) or Baseline (serum) for Women of Childbearing Potential (WOCBP), or plan to become pregnant during the study

  15. Liver Enzyme Lab Outcomes within the previous 2 months (or assessed at Baseline if not available at Screening ), see § 12.1.1:

    1. Bilirubin > upper limit normal (ULN)
    2. Liver transaminases (Aspartate Aminotransferase [AST] and Alanine Aminotransferase [ALT]) > 2 times ULN
    3. Gamma-glutamyltransferase (GGT) > 2 times ULN

  16. Clinically significant electrocardiogram (ECG) abnormalities:

    a. Marked baseline prolongation of QT/QTc interval (e.g., repeated demonstration of a QTc interval > 450 ms)

  17. History of additional risk factors for Torsades de Pointes (e.g., heart failure, hypokalemia, family history of Long QT Syndrome)
  18. Concurrent participation in another clinical study or participation in another clinical study within 30 days or five half-lives of the experimental drug (whichever is longer) prior to screening visit (V0)
  19. Diagnosed anxiety disorders, psychosis, depression, schizophrenia, attempted suicide, or other significant psychiatric conditions that could impact their ability to cooperate and comply with the study protocol
  20. Major surgery (at the discretion of the Principal Investigator or medically qualified designee) within eight weeks before screening or scheduled/planned surgery within the time frame of the study

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: Triple

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: paliroden (CIL001)
Those receiving a one-time unilateral transtympanic injection of 0.4mL of paliroden (CIL001)
Drug: paliroden (CIL001)
One-time unilateral transtympanic injection of 0.4mL of paliroden (CIL001)
Placebo Comparator: Placebo
Those receiving a one-time unilateral transtympanic injection of 0.4mL of non-matching placebo
Drug: Placebo
One-time unilateral transtympanic injection of 0.4mL of non-matching placebo

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Time Frame
Incidence, nature, and severity of adverse events (AEs) and serious adverse events (SAEs) from baseline to 6 months (168 days). Safety data, including all observed AEs with a particular focus on ear and auditory symptomatology.
Time Frame: From baseline to 6 months (168 days) after injection
From baseline to 6 months (168 days) after injection

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Determine the concentration in plasma of paliroden with Area under the plasma concentration versus time curve (AUC)
Time Frame: From the day of injection to 28 days
From the day of injection to 28 days
Determine the concentration in plasma of paliroden with Peak Plasma Concentration (Cmax)
Time Frame: From the day of injection to 28 days
From the day of injection to 28 days
Determine the time to maximum plasma concentration (Tmax).
Time Frame: From the day of injection to 28 days
From the day of injection to 28 days
Change from baseline in auditory function using speech-in-noise intelligibility as measured by the English (US) Matrix Test (AE-Matrix) and Time Compressed Words.
Time Frame: From baseline to day 28, day 56, day 84, and day 168

For AE-Matrix: Speech level will be fixed at 65 dB HL, while noise level will be adjusted based on responses to determine levels at which participants obtained a speech reception threshold of 50% (in dB).

For Time Compressed Words: This test consists of 50 carrier phrase and word stimuli from the Northwestern University Auditory Test No. 6 (NU-6) pool of 200 words that are compressed 60% (i.e., 60% of the carrier phrase and word has been removed). Participants will be asked to repeat the words they hear. Speech will be presented at 55 dB HL. Performance will be assessed by counting the number of words repeated correctly.
From baseline to day 28, day 56, day 84, and day 168

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Cilcare SAS

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Estimated)

January 1, 2027

Primary Completion (Estimated)

January 1, 2028

Study Completion (Estimated)

June 1, 2028

Study Registration Dates

First Submitted

September 4, 2026

First Submitted That Met QC Criteria

September 15, 2026

First Posted (Actual)

September 17, 2026

Study Record Updates

Last Update Posted (Actual)

September 17, 2026

Last Update Submitted That Met QC Criteria

September 15, 2026

Last Verified

September 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • REACT

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

UNDECIDED

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

Yes

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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