Clinical Trial Results:
To evaluate the safety and effectiveness of human ex vivo expanded autologous limbal stem cells for the treatment of unilateral total limbal stem cell deficiency.
Summary
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EudraCT number |
2011-000608-16 |
Trial protocol |
GB |
Global end of trial date |
09 Feb 2018
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Results information
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Results version number |
v1(current) |
This version publication date |
02 Jun 2024
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First version publication date |
02 Jun 2024
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Other versions |
Trial Information
Subject Disposition
Baseline Characteristics
End Points
Adverse Events
More Information
Subject Disposition
Baseline Characteristics
End Points
Adverse Events
More Information
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Trial identification
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Sponsor protocol code |
5466
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Additional study identifiers
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ISRCTN number |
ISRCTN51772481 | ||
US NCT number |
- | ||
WHO universal trial number (UTN) |
- | ||
Sponsors
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Sponsor organisation name |
The Newcastle upon Tyne Hospitals NHS Foundation Trust
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Sponsor organisation address |
Regent Point, Regent Farm Road, Gosforth, Newcastle upon Tyne, United Kingdom, NE3 3HD
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Public contact |
Prof Francisco Figueiredo, The Newcastle upon Tyne Hospitals NHS Foundation Trust, 0191 282 5582, f.c.figueiredo@ncl.ac.uk
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Scientific contact |
Prof Francisco Figueiredo, The Newcastle upon Tyne Hospitals NHS Foundation Trust, 0191 282 5582, f.c.figueiredo@ncl.ac.uk
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Paediatric regulatory details
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Is trial part of an agreed paediatric investigation plan (PIP) |
No
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Does article 45 of REGULATION (EC) No 1901/2006 apply to this trial? |
No
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Does article 46 of REGULATION (EC) No 1901/2006 apply to this trial? |
No
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Results analysis stage
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Analysis stage |
Final
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Date of interim/final analysis |
17 Jan 2020
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Is this the analysis of the primary completion data? |
Yes
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Primary completion date |
09 Feb 2018
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Global end of trial reached? |
Yes
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Global end of trial date |
09 Feb 2018
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Was the trial ended prematurely? |
No
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General information about the trial
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Main objective of the trial |
To evaluate the safety and efficacy (or capacity to produce a desired effect) of ex vivo expanded autologous Limbal Stem Cells transplantation (transplant derived from the same patient, animal free and grown ex vivo or outside the body) for the treatment of unilateral total Limbal Stem Cell Deficiency (a severe corneal disease resulting in painful blindness). The product is manufactured according to GMP guidelines and under a Quality Management System.
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Protection of trial subjects |
All non-serious adverse events/reaction will be recorded at all visits up to visit 7 at 12 months and all non-serious
adverse reactions from visit 7 at 12 months to visit 10 at 36 months.
Any serious adverse events will be recorded throughout the duration of the study until 36 months.
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Background therapy |
Ex vivo expansion of autologous limbal stem cells transplantation on amniotic membrane has been used in a few centres around the world, including the UK for the treatment of unilateral total limbal stem cell deficiency, even though this is an unlicensed indication. For purposes of this study, Ex vivo expansion of autologous limbal stem cells transplantation on amniotic membrane is both an Advanced Therapeutic Medicinal Product (ATMP) and an Investigational Medicinal Product and thus it meets the combined definition of an Advanced Therapeutic Investigational Medicinal Product (ATIMP) Regulation (EU) No 1394/2007. | ||
Evidence for comparator |
Corneal vascularisation and opacity cause blindness in ~8 million people worldwide pa, but the importance of limbal stem cells (LSC), and the symptoms of their dysfunction as a major cause of corneal blindness, have been appreciated only recently. In LSC deficiency (LSCD), reduced vision is due to corneal pathology as the eye is otherwise healthy; effective treatment of LSCD and associated corneal scarring would restore vision. This group has developed a system to culture human limbal epithelium without the use of animal cells/products, and has successfully transplanted nine patients with unilateral severe LSCD. Autologous human serum drops, from patients’ blood, and the culture medium, are used post-operatively to treat any ocular surface problems. Significantly declined symptom severity, significant improvement in visual impairment scores, and in Snellen visual acuity, were observed. Corneal impression cytology at six months post-procedure confirmed the reversal of conjunctivalisation. Treatment of severe symptomatic total LSCD is mainly surgical – a limbal tissue autograft from the patient’s healthy other eye. In bilateral LSCD, allografts from living related/cadaveric donors are used, with potent immunosuppression. However, much healthy tissue is required, potentially causing LSCD in the donor. Recently, small amounts of healthy human limbal epithelium have been expanded ex vivo in culture to form epithelial sheets, and transplanted, with reduced risk of donor LSCD. This formal clinical trial aims to establish transplantation of cultured limbal epithelium as a clinical treatment option for LSCD. Most current techniques also use animal products, precluding their clinical use to treat UK patients legally. There is also an increasing need to substitute animal-based products during the ex vivo expansion of the cells, due to the risk of transmission of retroviruses, other pathogens or other infectious agents to patients and the wider population. | ||
Actual start date of recruitment |
30 May 2012
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Long term follow-up planned |
No
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Independent data monitoring committee (IDMC) involvement? |
Yes
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Population of trial subjects
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Number of subjects enrolled per country |
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Country: Number of subjects enrolled |
United Kingdom: 27
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Worldwide total number of subjects |
27
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EEA total number of subjects |
27
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Number of subjects enrolled per age group |
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In utero |
0
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Preterm newborn - gestational age < 37 wk |
0
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Newborns (0-27 days) |
0
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Infants and toddlers (28 days-23 months) |
0
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Children (2-11 years) |
0
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Adolescents (12-17 years) |
0
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Adults (18-64 years) |
25
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From 65 to 84 years |
2
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85 years and over |
0
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Recruitment
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Recruitment details |
The recruitment period ran from 15 May 2012 to 05 January 2015 from one NHS hospital site in the United Kingdom. This was the Royal Victoria Infirmary in Newcastle upon Tyne (The Newcastle upon Tyne Hospitals NHS Foundation Trust). | ||||||||||||||||
Pre-assignment
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Screening details |
Potential participants were identified by the CI via routine clinic outpatient appointments. The CI/Co-I/Authorised Delegate explained the study to eligible patients. Eligibility screening forms were completed, to document patients' fulfilment of the eligibility criteria, whether included or not. | ||||||||||||||||
Period 1
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Period 1 title |
Baseline
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Is this the baseline period? |
Yes | ||||||||||||||||
Allocation method |
Not applicable
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Blinding used |
Not blinded | ||||||||||||||||
Blinding implementation details |
Not applicable
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Arms
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Arm title
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LSC Transplant | ||||||||||||||||
Arm description |
- | ||||||||||||||||
Arm type |
surgical intervention | ||||||||||||||||
Investigational medicinal product name |
Autologous LSC transplant
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Investigational medicinal product code |
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Other name |
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Pharmaceutical forms |
Ophthalmic insert
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Routes of administration |
Route of administration not applicable
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Dosage and administration details |
Autologous Limbal Stem Cell (LSC) transplantation
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Period 2
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Period 2 title |
6 months
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Is this the baseline period? |
No | ||||||||||||||||
Allocation method |
Not applicable
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Blinding used |
Not blinded | ||||||||||||||||
Blinding implementation details |
Not applicable
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Arms
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Arm title
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LSC Transplant | ||||||||||||||||
Arm description |
- | ||||||||||||||||
Arm type |
surgical intervention | ||||||||||||||||
Investigational medicinal product name |
Autologous LSC transplant
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Investigational medicinal product code |
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Other name |
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Pharmaceutical forms |
Ophthalmic insert
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Routes of administration |
Route of administration not applicable
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Dosage and administration details |
Autologous Limbal Stem Cell (LSC) transplantation
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Period 3
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Period 3 title |
12 months
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Is this the baseline period? |
No | ||||||||||||||||
Allocation method |
Not applicable
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Blinding used |
Not blinded | ||||||||||||||||
Blinding implementation details |
Not applicable
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Arms
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Arm title
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LSC Transplant | ||||||||||||||||
Arm description |
- | ||||||||||||||||
Arm type |
surgical intervention | ||||||||||||||||
Investigational medicinal product name |
Autologous LSC transplant
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Investigational medicinal product code |
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Other name |
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Pharmaceutical forms |
Ophthalmic insert
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Routes of administration |
Route of administration not applicable
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Dosage and administration details |
Autologous Limbal Stem Cell (LSC) transplantation
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Period 4
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Period 4 title |
36 months
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Is this the baseline period? |
No | ||||||||||||||||
Allocation method |
Not applicable
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Blinding used |
Not blinded | ||||||||||||||||
Blinding implementation details |
Not applicable
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Arms
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Arm title
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LSC Transplant | ||||||||||||||||
Arm description |
- | ||||||||||||||||
Arm type |
surgical intervention | ||||||||||||||||
Investigational medicinal product name |
Autologous LSC transplant
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Investigational medicinal product code |
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Other name |
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Pharmaceutical forms |
Ophthalmic insert
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Routes of administration |
Route of administration not applicable
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Dosage and administration details |
Autologous Limbal Stem Cell (LSC) transplantation
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Baseline characteristics reporting groups
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Reporting group title |
Baseline
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Reporting group description |
- | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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End points reporting groups
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Reporting group title |
LSC Transplant
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Reporting group description |
- | ||
Reporting group title |
LSC Transplant
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Reporting group description |
- | ||
Reporting group title |
LSC Transplant
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Reporting group description |
- | ||
Reporting group title |
LSC Transplant
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Reporting group description |
- |
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End point title |
The percent of subjects with treatment emergent ocular AEs [1] | ||||||
End point description |
The percent of subjects with treatment emergent ocular AEs.
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End point type |
Primary
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End point timeframe |
12 months.
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Notes [1] - No statistical analyses have been specified for this primary end point. It is expected there is at least one statistical analysis for each primary end point. Justification: Descriptive summary is only available. |
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No statistical analyses for this end point |
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End point title |
Ocular surface pain/discomfort | ||||||||||||
End point description |
The first end-point of the phase II clinical trial will assess changes of patients' reported outcomes: ocular surface pain/discomfort (the primary outcome on which the study was powered) and visual impairment scores from baseline to visit 7 at 12 months. This will be measured in both cases using an analogue scale, which has already been validated in the phase I component of the project (Attachment III).
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End point type |
Primary
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End point timeframe |
baseline to visit 7 at 12 months
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Notes [2] - 1 missing result |
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Statistical analysis title |
Difference in Pain | ||||||||||||
Statistical analysis description |
The change in pain between baseline and Visit 7 (12 months post-op) was recorded by ‘ocular pain’ in the National Eye Institute – Visual Function Questionnaire and a Visual Analogue Score for pain. A high score for the Visual Function Questionnaire indicates better functioning and the percentage recorded is the achieved percentage of a total possible score.
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Comparison groups |
LSC Transplant v LSC Transplant
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Number of subjects included in analysis |
49
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Analysis specification |
Pre-specified
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Analysis type |
other | ||||||||||||
P-value |
= 0.02 | ||||||||||||
Method |
Wilcoxon signed ranks test | ||||||||||||
Confidence interval |
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End point title |
Visual impairment score [3] | ||||||||
End point description |
The first end-point of the phase II clinical trial will assess changes of patients' reported outcomes: ocular surface pain/discomfort (the primary outcome on which the study was powered) and visual impairment scores from baseline to visit 7 at 12 months. This will be measured in both cases using an analogue scale, which has already been validated in the phase I component of the project (Attachment III).
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End point type |
Primary
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End point timeframe |
12 months and 36 months.
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Notes [3] - No statistical analyses have been specified for this primary end point. It is expected there is at least one statistical analysis for each primary end point. Justification: Descriptive summary is only available. |
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No statistical analyses for this end point |
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End point title |
Corneal impression cytology [4] | ||||||||
End point description |
The second end point will be the reversal of LSCD by corneal impression cytology at 6 months post-operatively.
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End point type |
Primary
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End point timeframe |
Six months, post-operative.
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Notes [4] - No statistical analyses have been specified for this primary end point. It is expected there is at least one statistical analysis for each primary end point. Justification: Descriptive summary is only available. |
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No statistical analyses for this end point |
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End point title |
Corneal re-epithelialisation [5] | ||||||||||||||||
End point description |
The third end point is ocular surface reconstruction (i.e. corneal re-epithelialisation).
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End point type |
Primary
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End point timeframe |
12 months and 36 months
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Notes [5] - No statistical analyses have been specified for this primary end point. It is expected there is at least one statistical analysis for each primary end point. Justification: Descriptive summary is only available. |
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Notes [6] - 22 patients in ITT group [7] - 22 patients in ITT group [8] - 21 patients analysed in ITT group |
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No statistical analyses for this end point |
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End point title |
Best corrected visual acuity | ||||||||||||
End point description |
Changes over the same period in best corrected visual acuity, reversal in central corneal vascularisation, reduction in corneal opacity, improvement in patient's reported outcomes, assessment of corneal opacity by anterior segment OCT, assessment of corneal/limbal epithelia by confocal microscopy and potential side effects as described in the case for support.
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End point type |
Secondary
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End point timeframe |
12 months and 36 months.
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Statistical analysis title |
Change in LogMAR score | ||||||||||||
Statistical analysis description |
Wilcoxon signed ranks test
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Comparison groups |
LSC Transplant v LSC Transplant
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Number of subjects included in analysis |
34
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Analysis specification |
Pre-specified
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Analysis type |
other | ||||||||||||
P-value |
= 0.1 | ||||||||||||
Method |
Wilcoxon signed ranks test | ||||||||||||
Confidence interval |
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End point title |
Reversal in central corneal vascularisation | |||||||||||||||||||||||||||||||||||
End point description |
Changes over the same period in best corrected visual acuity, reversal in central corneal vascularisation, reduction in corneal opacity, improvement in patient's reported outcomes, assessment of corneal opacity by anterior segment OCT, assessment of corneal/limbal epithelia by confocal microscopy and potential side effects as described in the case for support.
Central corneal neovascularisation (new vessel formation, crossing the limbus onto the clear cornea by ≥ 2mm) (Akpek EK et al.
2004) will be categorised:
0 Absent No evidence of new vessel formation
1 Mild Presence of neovascularisation in 1
quadrant of cornea
2 Moderate Presence of neovascularisation in 2
quadrants of cornea
3 Severe Presence of neovascularisation in ≥ 3
quadrants of cornea
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End point type |
Secondary
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End point timeframe |
12 months and 36 months.
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Notes [9] - missing result from 1 patient |
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No statistical analyses for this end point |
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End point title |
Reduction in corneal opacity | ||||||||||||||||||||||||||||||||||||||||
End point description |
Changes over the same period in best corrected visual acuity, reversal in central corneal vascularisation, reduction in corneal opacity, improvement in patient's reported outcomes, assessment of corneal opacity by anterior segment OCT, assessment of corneal/limbal epithelia by confocal microscopy and potential side effects as described in the case for support.
Corneal opacity will be categorised as:
0 Clear cornea
+1 Mild scarring
+2 Moderate scarring, iris details still visible
+3 Moderate scarring, iris details obscured
+4 Marked corneal scarring, iris not visible
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End point type |
Secondary
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End point timeframe |
12 months and 36 months.
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Notes [10] - missing result from 1 patient [11] - missing result from 1 patient |
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No statistical analyses for this end point |
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End point title |
Improvement in patient-reported outcomes | ||||||||||||||||||||
End point description |
Ocular surface disease impact questionnaire
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End point type |
Secondary
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End point timeframe |
12 months and 36 months.
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Notes [12] - 4 patient results missing [13] - 1 missing result [14] - missing result for 2 patients |
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No statistical analyses for this end point |
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End point title |
Assessment of corneal opacity by anterior segment OCT | ||||||||||||||||||||||||||||||||||||||||
End point description |
Assessment of corneal opacity by anterior segment OCT:
Scale 0-4
0= clear cornea
1= mild scarring
2= moderate scarring, iris details still visible,
3=moderate scarring, iris details obscured
4= marked corneal scarring, iris not visible
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End point type |
Secondary
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End point timeframe |
12 months and 36 months.
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Notes [15] - missing result from 1 patient [16] - missing result from 1 patient |
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No statistical analyses for this end point |
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End point title |
Improvement in patient-reported outcomes: National Eye Institute Visual Function Questionnaire | ||||||||||||||||||||
End point description |
National Eye Institute Visual Function Questionnaire
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End point type |
Secondary
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End point timeframe |
Baseline, 6 months, 12 months and 36 months
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Notes [17] - results missing from 4 patients [18] - 2 results missing |
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No statistical analyses for this end point |
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Adverse events information
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Timeframe for reporting adverse events |
Assessment of adverse events will be performed at follow-up visits.
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Adverse event reporting additional description |
AEs will be assessed at each trial follow-up visit, in person.
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Assessment type |
Systematic | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Dictionary used for adverse event reporting
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Dictionary name |
Verbatim | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Dictionary version |
1.0
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Reporting groups
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Reporting group title |
LSC Transplant
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Reporting group description |
In summary: - there were 42 reported AE in 18 (78% of 23) unique patients - there were 10 AE related (possibly, probably or definitely) to intervention reported in 7 (30% of 23) unique patients. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Frequency threshold for reporting non-serious adverse events: 0% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Substantial protocol amendments (globally) |
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Were there any global substantial amendments to the protocol? Yes | |||
Date |
Amendment |
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20 Jan 2012 |
In response to the conditions of favourable opinion specified by REC, the Patient Information Sheet has been amended to include further information on alternative options, if cells do not grow well, and correct REC name.
Substantial changes to the study, in response to the MHRA CTA, regarding its duration (to 36 months), and the prohibition of concurrent enrolment of participants in another study. |
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11 Sep 2013 |
The proposed changes to the protocol were the removal of previous amniotic membrane grafting to the donor eye, as an exclusion criterion; and the amendment to specify that only those patients who have been previously transplanted with ex vivo expanded autologous limbal stem cells being excluded. |
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Interruptions (globally) |
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Were there any global interruptions to the trial? No | |||
Limitations and caveats |
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Limitations of the trial such as small numbers of subjects analysed or technical problems leading to unreliable data. | |||
None reported |