ClinicalTrials.gg
RecruitingNCT05324748REGONUpdated Nov 24, 2025

Repeated GON Injections in CCH

A Phase 3 interventional study of Methylprednisolone and Saline solution in Cluster Headache, sponsored by Leiden University Medical Center. Recruiting at 2 sites in Netherlands. Open to participants aged 18 Years to 70 Years. Per ClinicalTrials.gov, last updated 2025-11-24.

Sponsored by Leiden University Medical Center · Phase 3, Interventional, and Treatment

From the registry’s dates

  • Primary completion was expected by Dec 2025, 11 months ago, but the record still lists the study as recruiting.
  • Started Nov 2022; still recruiting 4 years later.
Phase
Phase 3
Study type
Interventional
Enrollment
50
Allocation
Randomized
Ages
18 Years to 70 Years
Sex
All
01

Study summary

Background:

- The effect of repeated GON-injections has never been studied in a double-blind randomized trial as a prophylactic therapy in a well-documented group of chronic patients. As such, (repeated) GON-injection has not yet found its place in current (inter)national treatment protocols for chronic cluster headache.

Objectives:

- The primary objective is to determine if repeated GON-injection result in effective control of cluster headache attacks for more days compared to placebo in chronic cluster headache.

Eligibility:

- Patients will be selected from the LUMC (Leiden University Medical Center) and CWZ (Canisius Wilhelmina Hospital) chronic cluster headache populations, diagnosed based upon the ICHD-3.

Design:

- Bi-centre, randomized, double-blind, placebo-controlled retention trial with a maximum follow-up of one year.

Read the detailed description

A single injection of the greater occipital nerve (GON) with corticosteroids ('GON-injection') has been shown to be efficacious for the prophylactic treatment of cluster headache, with only mild, local side effects and often has its effect within days. It is a low-cost and safe treatment option; however, the beneficial effects are limited to weeks to months. This makes the injection suitable for episodic cluster headache, where periods with headache attacks last weeks to months. However, the effect of repeated GON-injections has never been studied in a double-blind randomized trial as a prophylactic therapy in a well-documented group of chronic patients. As such, (repeated) GON-injection has not yet found its place in current (inter)national treatment protocols for chronic cluster headache. The injection is often only used as a last-resort treatment in a very limited number of headache centres in a trial-and-error approach with a treatment interval varying between 3 and 6 months. It is, therefore, not known what chronic cluster headache patients can expect from this treatment.

Hypothesis: Repeated GON-injections are a safe, well-tolerated, convenient, and cost-effective therapy to rapidly and long-term reduce the attack frequency in chronic cluster headache.

02

Conditions studied

  • Cluster Headache

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Keywords

  • GON-injection
03

In context

Cluster Headache

123 studies on the registry are indexed under Cluster Headache; 26 are open to participants now.

This study's planned enrollment of 50 is above the median of 42 across 90 interventional studies indexed under Cluster Headache.

Browse Cluster Headache studies →

Lead sponsor

Leiden University Medical Center is the lead sponsor of 334 studies on the registry; 110 are open to participants now.

Counted across the registry records on this site, refreshed daily.

04

Who can participate

Ages eligible
18 Years to 70 Years
Sexes eligible
All
Accepts healthy volunteers
No

Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.

Inclusion criteria

  • Age ≥18 and ≤ 70 years
  • Chronic cluster headache (International Classification of Headache Disorders - third edition; ICHD-3)
  • Ictal pain must be always at the same side
  • ≥4 weekly attacks of cluster headache in the prospective one-month baseline observation period
  • On a stable regimen of cluster headache prophylactics for >4 weeks prior to onset of study treatment and agreeing not to increase the dose and not starting a new cluster prophylactic during the study period

Exclusion criteria

Exclusion Criteria:

  • against, or current use of,
  • Occipital nerve stimulation (ONS)
  • Use of anticoagulation medication or a known bleeding disorder
  • Inability to use an electronic diary to monitor individual attacks and other items
  • Other headaches if the patient cannot reliably distinguish them from attacks of cluster headache
  • Current use of prophylactic medication for other headaches
  • Pregnancy
Terms in these criteria, in plain language(2)

Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.

Contraindication

A reason a treatment, test or procedure should not be given to a particular person, such as an allergy, another illness or a medicine they take.

Corticosteroids (steroids)

Anti-inflammatory medicines such as prednisone, prednisolone and dexamethasone — not the anabolic steroids used for muscle.

Studies differ in what they allow: check which steroid medicines, routes (tablets, injections, creams, inhalers, eye drops) and doses this study accepts.

05

Study design

Phase
Phase 3
Primary purpose
Treatment
Allocation
Randomized
Intervention model
Parallel assignment
Masking
Quadruple (Participant, Care provider, Investigator, Outcomes assessor)
Enrollment
50 participants (estimated)

Study arms

  • Placebo comparator
    Placebo Arm

    Drug: Saline solution

  • Experimental
    Intervention Arm

    Drug: Methylprednisolone

Interventions

06

What researchers measure

Primary outcomes

  1. mean number of days, from first injection until discontinuation, study participants remain using study medication (retention rate in survival curve)

    Time frame: 1 year

Secondary outcomes

  1. Frequency of weekly cluster headache attacks vs. baseline

    Time frame: 1 year

  2. Mean duration of attacks vs. baseline

    Time frame: 1 year

  3. Mean severity (1-10) of attacks vs. baseline

    Time frame: 1 year

  4. Proportion of study participants with >50% or 100% reduction in attack frequency vs. baseline

    Time frame: 1 year

  5. Median injection interval

    Time frame: 1 year

  6. Adverse events

    Time frame: 1 year

  7. Ultrasound structural integrity of the greater occipital nerve

    Time frame: 1 year

07

Study locations

2 of 2 sites recruiting
08

Updates

Tracking since Sep 25, 2026
No changes since tracking began. The registry record was last updated on Nov 24, 2025, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
09

Registry details

Key details

Study ID
NCT05324748
Collaborators
ZonMw: The Netherlands Organisation for Health Research and Development
Responsible party
Rolf Fronczek (Principal Investigator, Leiden University Medical Center) — Principal investigator
First posted
Apr 12, 2022
Start date
Nov 7, 2022
Primary completion
Dec 2025 (estimated)
Completion
Jun 2026 (estimated)
Last update
Nov 24, 2025

Study contacts

Willemijn Naber
Contact
w.c.naber@lumc.nl
0715262587

Oversight

Data monitoring committee
Yes
FDA-regulated drug
No
FDA-regulated device
No
View the source record on ClinicalTrials.gov ↗

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Studies of the drug tested here: Methylprednisolone

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