Clinical trial Recruiting at 1 site Phase2; Phase3 Interventional Ages 18 and up

Sinonasal microbiome transplant for chronic rhinosinusitis

Official title: Sinonasal Microbiome Transplant as a Therapy for Chronic Rhinosinusitis (CRS): A Randomized , Placebo Controlled Cross Over Trial

Run by Region Skane · NCT07184684 · Data updated 2026-11-12

This will try a sinonasal microbiome transplant to see if it reduces symptoms in people with chronic rhinosinusitis with or without nasal polyps.

Quick facts

PhasePhase2; Phase3
Study typeInterventional
Ages18 Years and up
SexAll
Enrollment50 (estimated)
SponsorRegion Skane
Academic / other
Locations1 site (Helsingborg)
StatusRecruiting
StartedOctober 14, 2024
Main results expectedFebruary 2028
Study endsFebruary 2031
Registry record updatedSeptember 22, 2025
Trial IDNCT07184684 on ClinicalTrials.gov

Is this trial a fit for you?

Likely a good fit

Ideal candidates are adults with physician-verified chronic rhinosinusitis lasting more than 12 weeks, meaningful symptom burden (SNOT-22 ≥20), no recent antibiotic use, and who are willing to accept an approved donor.

Probably not a fit

Patients who recently took antibiotics, are receiving biologic therapies, have significant immunodeficiency or severe anatomic abnormalities, are pregnant or breastfeeding, or have low symptom scores (SNOT-22 <20) are unlikely to benefit or be eligible.

A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.

What this trial studies

Adults with chronic rhinosinusitis (duration >12 weeks) will receive either a donor-derived sinonasal microbiome transplant or a placebo saline transplant delivered to the nasal cavities. Donors must meet strict health criteria and be accepted by the patient, and participants with recent antibiotics, biologic therapy, pregnancy, or major immunodeficiency are excluded. Outcomes will include symptom scores and objective nasal/sinus findings over follow-up to compare the active transplant versus placebo. The protocol is conducted at the Department of ORL in Helsingborg and spans phase 2 and phase 3 testing.

Why it matters

Potential benefit: If successful, the procedure could reduce chronic sinus symptoms and decrease the need for repeated antibiotics or surgery.

How similar studies have gone: The approach is relatively novel for CRS: there are limited pilot and preclinical data suggesting microbiome modulation might help, but large controlled clinical evidence is still sparse.

Who can join: the full rules

Show full inclusion / exclusion criteria
Inclusion Criteria (CRS-Patients):

* 2 nasal symptoms, 1 of which must be nasal obstruction or discolored discharge.
* Sinusitis verified by endoscopy or CT scan
* Duration \> 12 weeks.
* Signed informed consent to participate in the study.

Exclusion Criteria (CRS-Patients):

* Antibiotic treatment in the last 3 months before study start.
* Ongoing or recent participation in another clinical trial.
* Any medication that might affect the results in an unpredictable manner.
* Treatment with monoclonal antibodies (biologics).
* Immunodeficiency other than low grade MBL deficiency.
* Pregnancy or breastfeeding
* Severe anatomical abnormalities.
* SNOT 22 \< 20.

Inclusion Criteria (Donors):

* No history of sinonasal or lower airway disease within the last two years other than the common cold.
* Accepted as a donor by the patient.
* Signed informed consent to participate in the study.

Exclusion Criteria (CRS-Patients):

* Chronic rhinosinusitis.
* Acute rhinosinusitis within the last two years.
* Nasal polyposis
* Antibiotic treatment within the last 3 months before the study start.
* On going or recent participation in another clinical trial.
* Findings in the pre study scan that makes the donor unsuitable.

Where it's running

  • Departement of ORL
    Helsingborg, Sweden
    Recruiting

Study contacts

Similar studies

Other studies for the same condition or treatment. Recruiting studies are listed first.

How to take part

  1. Review the eligibility criteria above with your treating physician.
  2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
  3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.
Last reviewed 2026-11-14 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.