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Trial record 1 of 1 for:    NCT01868620
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Non-inferiority Trial of Iontophoretic Corneal Collagen Crosslinking (CXL) Compared to Standard Corneal Collagen Crosslinking in Progressive Keratoconus. (IONTO-CXL)

The recruitment status of this study is unknown. The completion date has passed and the status has not been verified in more than two years.
Verified December 2015 by University Hospital, Toulouse.
Recruitment status was:  Recruiting
Sponsor:
ClinicalTrials.gov Identifier:
NCT01868620
First Posted: June 4, 2013
Last Update Posted: December 3, 2015
The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details.
Collaborators:
Sooft Italia
Centre de Référence National du Kératocône
Information provided by (Responsible Party):
University Hospital, Toulouse
  Purpose

The primary purpose of the protocol is to compare the current standard CXL with iontophoretic CXL to provide evidence in relation to the efficacy and safety in progressive keratoconus.

Corneal collagen crosslinking (CXL) is the first surgical procedure that appears to halt the progression of keratoconus. In the current standard CXL, the central corneal epithelium must be debrided to efficiently permeate the corneal stroma with riboflavin. The epithelium debridement can cause severe pain, infection and stromal haze. The study hypothesis is that iontophorese CXL is as effective as standard CXL to stabilize a progressive keratoconus.


Condition Intervention Phase
Progressive Keratoconus Device: Iontophoretic CXL Device: Standard CXL Phase 3

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)
Primary Purpose: Treatment
Official Title: Non-inferiority Trial of Iontophoretic Corneal Collagen Crosslinking (CXL) Compared to Standard Corneal Collagen Crosslinking in Progressive Keratoconus.

Resource links provided by NLM:


Further study details as provided by University Hospital, Toulouse:

Primary Outcome Measures:
  • The main outcome parameter is the non-inferiority of iontophoretic CXL compared to standard CXL in progressive keratoconus [ Time Frame: Outcome measure is assessed at 1 year. ]
    Measuring maximum keratometry (K-max) derived from computerized videokeratography.


Secondary Outcome Measures:
  • Comparison of minimum keratometry [ Time Frame: 3 months ]
    Measure assessed by tomographic measurement.


Other Outcome Measures:
  • Comparison of mean keratometry [ Time Frame: At 1 year ]
    Tomographic measurement.

  • Comparison of postoperative pain and complications during the follow up [ Time Frame: Outcome measure is assessed at 1 year and at 3 months ]
  • Comparison of visual acuity [ Time Frame: Outcome measure is assessed at 1 year and at 3 months ]
  • Intraoperative comparison of corneal concentration of riboflavin [ Time Frame: Outcome measure is assessed at 1 year and at 3 months ]
  • Comparison of depth of treatment [ Time Frame: Outcome measure is assessed at 1 year and at 3 months ]
    By tomographic measurement

  • Comparison of biomechanical parameters [ Time Frame: Outcome measure is assessed at 1 year and at 3 months ]
    By ORA (Ocular Response Analyzer)

  • Comparison of corneal thickness [ Time Frame: Outcome measure is assessed at 1 year and at 3 months for the tomographic measurement. ]

Estimated Enrollment: 162
Study Start Date: May 2013
Estimated Study Completion Date: May 2017
Estimated Primary Completion Date: June 2016 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: Iontophoretic CXL
The iontophoretic CXL involves a constant current source and two electrodes. The main electrode is a circular cup, with a surrounding annular suction ring to affix the device on the cornea during the procedure. The electrode itself is a stainless steel grid, placed into the cup at a minimal distance from the cornea. The reservoir is filled with riboflavin solution. The generator applies a constant current of 1mA for a preset period of 5 min. After the riboflavin administration by iontophoresis, the cornea is irradiated by a UVA light for 3mW/cm2 during 30 minutes.
Device: Iontophoretic CXL
Active Comparator: Standard CXL
In the standard CXL, the epithelium is mechanically removed. Then, a solution of riboflavin is instilled each minute for 30 minutes. Corneas are irradiated by a UVA light for 3mW/cm2 during 30 minutes.
Device: Standard CXL

Detailed Description:

Keratoconus is a common bilateral progressive corneal ecstatic disease causing visual impairment by inducing irregular astigmatism and corneal opacities. This disorder typically begins during teenage years, progresses until the age of 30 to 40 years and, in severe forms, may need a corneal transplantation. CXL has changed the natural evolution of keratoconus. It creates links between collagen fibrils in order to rigidify the corneal stroma and slow down the progression of keratoconus. The corneal stroma is soaked with a riboflavin solution before being exposed to ultraviolet-A radiation.

In the current standard CXL, the central corneal epithelium must be debrided to allow the penetration of riboflavin into the cornea with a risk of side effects, such as pain for the first two post-operative days, temporary loss of visual acuity during the first three months, and serious complications such as infection and stromal opacity due to corneal scarring.

Iontophoresis is a non invasive technique in which a weak electric current is used to enhance the penetration of riboflavin into the cornea. The iontophoresis technique could allow intrastromal riboflavin diffusion, while keeping the corneal epithelium on, combining the efficiency of the standard procedure without the side effects of epithelial debridement.

  Eligibility

Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years and older   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
Criteria

Inclusion Criteria:

  • Age ≥ 18 years old
  • Corneal thickness ≥ 400 µm
  • Progressive stage 1 to 3 keratoconus (Krumeich classification)

Exclusion Criteria:

  • Corneal thickness < 400µm
  • Stage 4 keratoconus (Krumeich classification)
  • Concomitant corneal disease
  • History of corneal surgery
  Contacts and Locations
Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT01868620


Contacts
Contact: François MALECAZE, MD, PhD 0561777752 ext 33 malecaze.fr@chu-toulouse.fr

Locations
France
University Hospital Toulouse Recruiting
Toulouse, Midi-Pyrenees, France, 31059
Contact: François MALECAZE, MD, PhD    0561777752 ext 33    malecaze.fr@chu-toulouse.fr   
Contact: Pierre FOURNIE, MD, PhD    0561777404 ext 33    fournie.p@chu-toulouse.fr   
Principal Investigator: François MALECAZE, MD, PhD         
Sub-Investigator: Pierre FOURNIE, MD, PhD         
Sponsors and Collaborators
University Hospital, Toulouse
Sooft Italia
Centre de Référence National du Kératocône
Investigators
Principal Investigator: François MALECAZE, MD, PhD
  More Information

Publications:
von Sallmann L. Iontophoretic introduction of atropine and scopolamine into the rabbit eye. Arch Ophthalmol 1943;29:711-9.
Savoldelli M, Parel JM, D'Hermie F, Kasner L, Pouliquen Y, de Kozak Y, Behar-Cohen F. An histologic and ultrastructural study of the rat and the rabbit eye after iontophoresis. ARVO. Invest Ophthalmol Vis Sci 1998;39:S927.
Chauvaud D, Behar-Cohen F, Parel JM, Renard G. Transscleral iontophoresis of corticosteroids: Phase II Clinical Trial. ARVO Invest Ophthalmol Vis Sci 2000;41:S79.

Responsible Party: University Hospital, Toulouse
ClinicalTrials.gov Identifier: NCT01868620     History of Changes
Other Study ID Numbers: 13 030 03
HAO ( Other Identifier: University Hospital of Toulouse )
First Submitted: May 29, 2013
First Posted: June 4, 2013
Last Update Posted: December 3, 2015
Last Verified: December 2015

Keywords provided by University Hospital, Toulouse:
Progressive keratoconus
standard CXL
iontophoretic CXL
keratometry

Additional relevant MeSH terms:
Keratoconus
Corneal Diseases
Eye Diseases