Suprachoroidal Spheroidal Mesenchymal Stem Cell Implantation in Retinitis Pigmentosa: Clinical Results of 6 Months Follow-up
Purpose: This prospective clinical case series aimed to evaluate the effect of suprachoroidal implantation of mesenchymal stem cells (MSCs) in the form of spheroids as a stem cell therapy for retinitis pigmentosa (RP) patients with relatively good visual acuity. Methods: Fifteen eyes of 15 patients with RP who received suprachoroidal implantation of MSCs in the form of spheroids were included. Best corrected visual acuity (BCVA), 10-2 and 30-2 visual field examination and multifocal electroretinography (mfERG) recordings were recorded at baseline, postoperative first, third- and sixth-months during follow-up.
NCT05712148 — Retinitis Pigmentosa
Status: Completed
http://inclinicaltrials.com/retinitis-pigmentosa/NCT05712148/
NAC Attack, A Phase III, Multicenter, Randomized, Parallel, Double Masked, Placebo-Controlled Study Evaluating the Efficacy and Safety of Oral N-Acetylcysteine in Patients With Retinitis Pigmentosa
Retinitis pigmentosa (RP) is an inherited retinal degeneration caused by one of several mistakes in the genetic code. Such mistakes are called mutations. The mutations cause degeneration of rod photoreceptors which are responsible for vision in dim illumination resulting in night blindness. After rod photoreceptors are eliminated, gradual degeneration of cone photoreceptors occurs resulting in gradual constriction of side vision that eventually causes tunnel vision. Oxidative stress contributes to cone degeneration. N-acetylcysteine (NAC) reduces oxidative stress and in animal models of RP it slowed cone degeneration. In a phase I clinical trial in patients with RP, NAC taken by month for 6 months caused some small improvements in two different vision tests suggesting that long-term administration of NAC might slow cone degeneration in RP. NAC Attack is a clinical trial being conducted at many institutions in the US, Canada, Mexico, and Europe designed to determine if taking NAC for several years provides benefit in patients with RP.
NCT05537220 — Retinitis Pigmentosa
Status: Recruiting
http://inclinicaltrials.com/retinitis-pigmentosa/NCT05537220/
An Open-label, Phase II Study of ADX-2191 in Subjects With Retinitis Pigmentosa
An open-label Phase II clinical trial, 8 (eight) subjects with retinitis pigmentosa due to rhodopsin mutations (including P23H) will be identified and treated with serial intravitreal injections of ADX-2191 in the worse seeing eye. Ocular structure and function will be evaluated.
NCT05392179 — Retinitis Pigmentosa
Status: Completed
http://inclinicaltrials.com/retinitis-pigmentosa/NCT05392179/
A Phase 1/2 Study to Assess the Safety and Efficacy of OCU400 for Retinitis Pigmentosa Associated With NR2E3 and RHO Mutations and Leber Congenital Amaurosis With Mutation(s) in CEP290 Gene
This is a Phase 1/2 Study to Assess the Safety and Efficacy of OCU400 in patients with retinitis pigmentosa associated with NR2E3 and RHO mutations and in patients with LCA due to mutation(s) in CEP290 gene (OCU400-101). To document prospective eye pathology in the above subjects Investigators will also conduct a Natural History Study (OCU400-104)i This is a multicenter study, which will be conducted in two phases and will enroll up to a total of 24 subjects in the OCU400-101 and 100 subjects in the OCU400-104 study.
NCT05203939 — Retinitis Pigmentosa
Status: Recruiting
http://inclinicaltrials.com/retinitis-pigmentosa/NCT05203939/
A Phase 2b Randomized, Double-Masked, Sham-Controlled, Study to Evaluate the Efficacy and Safety of Intravitreal Injection of MCO-010 Optogenetic Therapy in Adults With Retinitis Pigmentosa [RESTORE]
The purpose of the study is to evaluate the safety and efficacy of a single intravitreal injection of virally-carried Multi-Characteristic Opsin (MCO-010).
NCT04945772 — Retinitis Pigmentosa
Status: Completed
http://inclinicaltrials.com/retinitis-pigmentosa/NCT04945772/
Natural History of the Progression of X-Linked Retinitis Pigmentosa
The objective of the study is to gain a better understanding of disease progression over time in participants with X-linked retinitis pigmentosa (XLRP).
NCT04926129 — X-Linked Retinitis Pigmentosa
Status: Completed
http://inclinicaltrials.com/x-linked-retinitis-pigmentosa/NCT04926129/
Phase 1 Study of the Feasibility and Safety of Intravitreal Autologous Bone Marrow CD34+ Stem Cell Therapy for Eyes With Vision Loss From Retinitis Pigmentosa
In this Phase 1 open-labeled prospective study, one eye of each participant with vision loss from retinitis pigmentosa will be administered intravitreal injection of autologous CD34+ stem cells harvested from bone marrow. Each participant will be examined serially for 6 months after study injection to determine safety and feasibility of this intervention.
NCT04925687 — Retinitis Pigmentosa
Status: Completed
http://inclinicaltrials.com/retinitis-pigmentosa/NCT04925687/
Effects of Oral N- Acetylcysteine on Macular Function in Retinitis Pigmentosa; a Phase 2 Randomized Controlled Trial
Retinitis pigmentosa (RP) is an inherited retinal disease with great heterogeneity. RP comprises a large group of genetic disorders causing progressive loss of vision. Despite many suggested treatments, there is actually no effective therapy for most types of RP at present. Mutations that cause RP initially lead to rod cell death. After rod photoreceptors' death, cone photoreceptors also gradually die. There are several hypotheses as to why mutation-induced rod photoreceptor cell death invariably leads to gradual dysfunction and death of cone photoreceptors resulting in severe visual acuity loss and blindness. Rods constitute 95 percent of cells in the outer retina. As they degenerate, oxygen consumption is reduced and the level of tissue oxygen markedly increases. After rods degeneration, several markers of oxidative damage appear in cones. This oxidative stress over time may lead to cone dysfunction and death. Antioxidants reduce markers of oxidative damage and promote cone function and survival. In RP, cone death occurs as a result of the death of rods, rather than as the result of the pathogenic mutations and therefore treatment with antioxidants may have the potential to be applied to all patients with RP irrespective of the disease-causing mutation. N-acetylcysteine is a derivative of L cysteine that plays a role in the biosynthesis of glutathione and neutralizes reactive oxygen species. It also has a direct antioxidant activity via its reactive sulfhydryl agent. Its systemic use shows an acceptable safety profile. It has been shown that the use of systemic N-acetylcysteine provides significant intraocular concentration and antioxidant activity that may lead to the promotion of cone function and survival. In a recent phase 1 randomized clinical trial (RCT), it was revealed that oral N-acetylcysteine (NAC) was safe and well-tolerated in patients with moderately advanced RP and might improve sub-optimally functioning macular cones. The authors concluded that a randomized, placebo-controlled trial is needed to determine if oral NAC can provide long-term stabilization and/or improvement in visual function in patients with RP. In this phase 2 RCT, eligible patients with the diagnosis of moderately advanced RP are randomly divided into two groups; treatment group (N-acetylcysteine tablets) and controls (placebo). Each group will be treated for 6 months. In this study, we will investigate if the use of oral N- acetylcysteine as a potent antioxidant agent can slow down or reverse the disease process in RP patients with prior moderate loss of vision. It may potentially demonstrate a treatment modality regardless of the genetic type of RP. The primary outcome measure will be the stability or improvement of the best-corrected visual acuity (BCVA). The secondary outcome measures will be changes in color vision, electroretinogram, visual field, structural OCT indices after 6 months. The same parameters will be re-evaluated 3 months after discontinuation of treatment at month 9.
NCT04864496 — Retinitis Pigmentosa
Status: Active, not recruiting
http://inclinicaltrials.com/retinitis-pigmentosa/NCT04864496/
Natural History Study of Retinitis Pigmentosa Type 11
Observational study of patients with retinitis pigmentosa type 11
NCT04805658 — Retinitis Pigmentosa
Status: Recruiting
http://inclinicaltrials.com/retinitis-pigmentosa/NCT04805658/
Investigation of Therapeutic Efficacy and Safety of Umbilical Cord Derived Mesenchymal Stem Cells (UMSCs) for the Management of Retinitis Pigmentosa (RP)
Retinitis pigmentosa (RP) is the most common hereditary retinal disorder (accounts for 20% of children attending blind schools in Pakistan) which causes degeneration of rod and cone photoreceptors. Rods and cones largely depend on the retinal pigment epithelium for their proper functioning. Various growth factors and their receptors are present in retinal epithelium and a number of genes are responsible for the production of these growth factors. Genetic mutation in any of these genes causes retinal degeneration by progressive loss of retinal pigment epithelium and photoreceptors. The disease initially starts with night blindness and leads to the loss of central vision and eventually total blindness. To date, there is no definitive cure for patients suffering from RP. Recently, stem cell based therapies have shown great promise for the management of RP. It is well documented that umbilical cord derived mesenchymal stem cells (UMSCs) have the ability to release various paracrine and immunomodulatory factors that are similar to those synthesized by retinal pigment epithelium. Multiple routes including systemic (intravenous) and localized (subretinal, intravitreal, suprachoroidal and sub-tenon) have been employed to administer UMSCs for the management of RP. It is important to note that deep sub-tenon region (space between the sclera and the conjunctiva) acts as both natural culture medium for cells and as immune privileged site because of avascularity of the region. It has been reported that the injection of UMSCs in sub-tenon space of human subjects have improved the visual acuity even after 1 year post-injection. In addition, the injection of UMSCs in suprachoroidal space enhances the entry of growth factors released by the cells into choroidal flow and maintain the constant growth factors secretion to the choroidal and retinal tissues. Limoli and colleagues were the first to report the suprachoroidal administration of cells being the safe mode of cell delivery with no complications. The present study is aimed to investigate the safety and therapeutic efficacy of UMSC injection employing two different routes (sub-tenon injection versus suprachoroidal injection) for the treatment of RP in human subjects.
NCT04763369 — Retinitis Pigmentosa (RP)
Status: Recruiting
http://inclinicaltrials.com/retinitis-pigmentosa-rp/NCT04763369/