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Evaluating OPN-375 for treating nasal polyps in adolescents

16-Week Randomized Double-Blind Placebo Controlled Parallel-Group Multicenter Study Evaluating the Efficacy and Safety of OPN-375 186 μg Twice a Day in Adolescents With Bilateral Nasal Polyps Followed With 12-Week Open-Label Treatment Phase

Phase 3 Interventional Optinose US Inc. · NCT03747458

This study is testing a new medication called OPN-375 to see if it can help teenagers with nasal polyps breathe better and reduce their symptoms.

Quick facts

PhasePhase 3
Study typeInterventional
Enrollment120 (estimated)
Ages12 Years to 17 Years
SexAll
SponsorOptinose US Inc. Industry-sponsored
Drugs / interventionsmepolizumab, reslizumab, dupilumab, Omalizumab
Locations29 sites (Birmingham, Alabama and 28 other locations)
Trial IDNCT03747458 on ClinicalTrials.gov

What this trial studies

This clinical trial is a 16-week randomized, double-blind, placebo-controlled study assessing the efficacy and safety of OPN-375, administered twice daily, in adolescents aged 12 to 17 with bilateral nasal polyps. Participants will be randomly assigned to receive either the active treatment or a placebo, with the primary focus on reducing nasal congestion and polyp severity. After the initial treatment phase, there will be an additional 12-week open-label treatment phase for those who complete the study. The trial aims to enroll approximately 120 adolescents across multiple centers.

Who should consider this trial

Good fit: Ideal candidates are adolescents aged 12 to 17 years with a diagnosis of bilateral nasal polyposis.

Not a fit: Patients who do not have bilateral nasal polyps or are outside the age range of 12 to 17 years may not benefit from this study.

Why it matters

Potential benefit: If successful, this treatment could significantly alleviate nasal congestion and improve quality of life for adolescents suffering from bilateral nasal polyps.

How similar studies have performed: Previous studies have shown promise in treating nasal polyps with similar intranasal therapies, suggesting potential for success in this approach.

Eligibility criteria

Show full inclusion / exclusion criteria 
Inclusion Criteria:

1. Male or female subjects aged 12 to 17 years, inclusive, at time of Visit 1 (Screening).
2. Female subjects, if sexually active, must:

   1. be practicing an effective method of birth control (e.g., prescription oral contraceptives, contraceptive injections, contraceptive patch, intrauterine device, double-barrier method \[e.g., condoms, diaphragm, or cervical cap with spermicidal foam, cream, or gel\], or male partner sterilization) before entry and throughout the study, or
   2. be surgically sterile, (have had a hysterectomy or bilateral oophorectomy, tubal ligation, or otherwise be incapable of pregnancy), or
   3. or agree to abstinence.
3. Ability to read and speak English
4. All female subjects not documented to be infertile (e.g., infertility due to congenital abnormality or surgical sterilization) must have a negative serum or urine beta-human chorionic gonadotropin (β-hCG) at Visit 1 (Screening) and a negative urine pregnancy test at the Visit 2 (Day 1/Randomization/Baseline)
5. Must have bilateral nasal polyposis with a grade of 1 to 3 in each of the nasal cavities as determined by a nasal polyp grading scale score measured by nasoendoscopy at Visit 1 (Screening)
6. Must report at least mild symptoms of nasal congestion/obstruction as demonstrated by an average morning nasal congestion/obstruction score of at least 1.0 over the last 7 days of the run-in period (Subjects not meeting this inclusion criterion may be re-screened once after at least 4 weeks.)
7. Subjects with comorbid asthma must be stable, defined as no exacerbations (e.g., no emergency room visits, hospitalization, or oral or parenteral steroid use) within the 3 months before Visit 1 (Screening). Subjects who received inhaled corticosteroids are required to be on no more than a moderate dosage regimen as defined by 2005 Global Initiative for Asthma Guidelines (GINA) for 1 month before Visit 1 (Screening) and to be expected to remain on it throughout the study. Visit 1 (Screening)
8. Must be able to cease treatment with intranasal medications including, but not limited to, intranasal oxymetazoline or any other decongestants, intranasal antihistamines, intranasal steroids, intranasal sodium cromolyn, nasal atropine, nasal ipratropium bromide, as well as inhaled corticosteroids (except permitted doses listed above for asthma) at Visit 1 (Screening). (Note: intranasal antibiotics and saline are permissible)
9. If taking oral antihistamines, must be on a stable regimen for at least 2 weeks prior to the Visit 1 (Screening), and agree to not change the dose of these medications until after Visit 3 (Week 4) of the study.
10. Subject (with assistance from parent or legal guardian if needed) must demonstrate the ability to correctly complete the daily diary during the run-in period to be eligible for randomization.
11. Must demonstrate correct use of the demo exhalation delivery system (EDS).
12. Must be capable, in the opinion of the investigator, of providing assent and the appropriate parent(s) or guardian must provide an informed consent to participate in the study.

Exclusion Criteria:

1. Pregnancy or lactation
2. Has a history of cystic fibrosis
3. Have used XHANCE® (fluticasone propionate) nasal spray within the past 2 months
4. Inability to achieve bilateral nasal airflow for any reason, including nasal septum deviation
5. Inability to examine both nasal cavities for any reason, including severe nasal septum deviation
6. Have history of nasal septum erosion, ulceration or perforation or evidence of such lesion on Visit 1 (Screening) nasal examination/nasoendoscopy
7. Other significant nasal pathology or abnormal anatomy
8. Has had any episode of epistaxis with frank bleeding in the 3 months before Visit 1 (Screening)
9. History of more than 5 sinus or nasal surgeries for either nasal polyps or nasal/sinus inflammation (lifetime) Visit 1 (Screening)
10. Have had any surgery on the nasal septum
11. History of sinus or nasal surgery within 6 months before Visit 1 (Screening)
12. History of any surgical procedure that prevents the ability to accurately to diagnose or grade polyps if the subject requires nasoendoscopy
13. Current, ongoing rhinitis medicamentosa (rebound rhinitis)
14. Have significant oral structural abnormalities (e.g., a cleft palate)
15. History of Churg-Strauss syndrome or dyskinetic ciliary syndromes
16. Purulent nasal infection (recent fever or symptoms of lethargy), acute sinusitis, or upper respiratory tract infection within 2 weeks before Visit 1 (Screening). Potential subjects presenting with one of these infections may be rescreened after 4 weeks
17. Have an allergy, hypersensitivity, or contraindication to corticosteroids or steroids
18. Have an allergy or hypersensitivity to any excipients in study drug
19. Exposure to any glucocorticoid treatment with potential for systemic effects (e.g., oral or parenteral steroids, high dose topical steroids) within 1 month before Visit 1 (Screening); except as noted in inclusion criteria for subjects with comorbid asthma
20. Currently receiving Nucala (mepolizumab), Cinquair (reslizumab), Dupixent (dupilumab), or Omalizumab (Xolair®) (note patients should not be removed from their therapy for the sole purpose of study participation)
21. Have nasal or oral candidiasis
22. Have taken a potent CYP3A4-inhibitor within 14 days before Visit 1 (Screening)
23. Any serious or unstable concurrent disease, psychiatric disorder, or any significant concomitant medical condition that, in the opinion of the investigator could confound the results of the study or could interfere with the subject's participation or compliance in the study, or pose a specific risk to the subject due to study participation
24. History or current diagnosis of glaucoma or ocular hypertension (intraocular pressure \>21 mmHg)
25. History of intraocular pressure elevation on any form of steroid therapy
26. Current diagnosis of the presence (in either eye) of a cataract of Grade 1 or greater as defined on the Eye Examination Worksheet OR, less than a Grade 1 cataract with associated visual impairment
27. A recent (within 1 year of Visit 1 (Screening) clinically significant history of drug or alcohol use, abuse, or dependence)
28. Positive urine drug screen at Visit 1 (Screening) for stimulants, opioids, or cocaine
29. Have participated in an investigational drug clinical trial within 30 days of Visit 1 (Screening)
30. Parents, guardian or caregivers of the subject who are employees of the investigator or study center, with direct involvement in the proposed study or other studies under the direction of that investigator or study center, as well as family members of the employees or the investigator

Where this trial is running

Birmingham, Alabama and 28 other locations

Study contacts

How to participate

  1. Review the eligibility criteria above with your treating physician.
  2. Visit the official trial page on ClinicalTrials.gov for the most current contact information and recruitment status.
  3. Contact the listed study coordinator or principal investigator to request pre-screening. Pre-screening is free and never obligates you to enroll.
View on ClinicalTrials.gov → Find more trials like this →
Conditions Bilateral Nasal Polyposis
Last reviewed 2026-06-13 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.