New Imaging Technology to Assess Effect of Enzyme Replacment Therapy on Eye Disease Progession in Mucopolysacchardiosis
Keywords
Abstract
Description
The mucopolysaccharidoses (MPS) are a group of hereditary disorders which arise from defects in enzymes which break down glycosaminoglycans (GAGs) which occur in a wide variety of tissues, resulting in multiple systemic complications. Sight loss occurs in MPS due to corneal clouding, retinal degeneration, glaucoma and damage to the optic nerve. Corneal opacification occurs in infancy in several MPS subtypes and in the untreated disease the opacification is thought to be progressive, contributing to significant visual impairment in many patients. Improvements in quality of life and lifespan as a result of early treatment (with enzyme replacement therapy and haematopoetic stem cell transplantation) have meant that management of ocular complications and preservation of vision has increased importance.
A repeatable, reliable technique for quantification of corneal clouding will allow objective demonstration of the effect of treatments such as ERT in stabilisation or improvement of corneal clouding, and to establish the natural history of corneal opacification in MPS.
The investigators have previously developed the Iris camera (Irisguard Corp, McLean, VA 22102, USA) technology to give an objective measure of corneal clouding (Irisguard model IGAD100 ®) (Aslam et al 2009). The investigators demonstrated that use of the iris camera for corneal opacification assessment in MPS is feasibile, practical and has shown evidence for validity and reliability (Aslam et al 2012) (research funded in part by Biomarin Europe Ltd). The densitometry program for the Pentacam® Scheimpflug camera has also been shown to be able to provide measurements of corneal clouding in MPS .This research proposal will allow us to use to these techniques to quantify corneal clouding over time in MPS patients and to assess the effects of treatment with ERT and HSCT on corneal opacification.
Dates
| Last Verified: | 10/31/2017 |
| First Submitted: | 09/09/2015 |
| Estimated Enrollment Submitted: | 10/19/2015 |
| First Posted: | 10/21/2015 |
| Last Update Submitted: | 11/23/2017 |
| Last Update Posted: | 11/27/2017 |
| Actual Study Start Date: | 10/31/2015 |
| Estimated Primary Completion Date: | 10/31/2020 |
| Estimated Study Completion Date: | 10/31/2020 |
Condition or disease
Phase
Arm Groups
| Arm | Intervention/treatment |
|---|---|
| MPS patient cohort Participants with Mucopolysaccharidosis. types I-IV, VI and VII will be recruited from the paediatric and adult ophthalmology. Participants over the age of three who are able to comply and be investigated. |
Eligibility Criteria
| Ages Eligible for Study | 3 Years To 3 Years |
| Sexes Eligible for Study | All |
| Sampling method | Non-Probability Sample |
| Accepts Healthy Volunteers | Yes |
| Criteria | Inclusion Criteria: - Adult and paediatric participants with MPS and corneal opacification will be potentially eligible for this study, including those untreated, treated with previous haematopetic stem cell transplant, and treated with ERT. - Participants who have a confirmed diagnosis of mucopolysaccharosisis type I (Hurler, Hurler/Scheie and Scheie), MPS type II (Hunter), type III (Sanfilippo) type IV (Morquio) and type VI (MaroteauxLamy), type VII (Sly) will be potentially eligible. In order to cooperate with the examinations, the participant needs to be able to hold relatively still while seated at an instrument with a head rest and hold fixation for several seconds for this reason participants over the age of 3 years will be eligible. Exclusion Criteria: - Those who are aged under 3 years or who have significant neurological involvement which would influence understanding and/or cooperation. |
Outcome
Primary Outcome Measures
1. Corneal densitometry scores in participants on treatment [60 months study period]
Secondary Outcome Measures
1. Corneal clouding score over time in patients on treatment. [60 months study period]
Other Outcome Measures
1. Repeatability and accessibility for each imaging technique [60 months study period]
2. Retinal morphology changes with Optos wide field digital imaging and high resolution OCT [60 months study period]
