Phase 2
N=53
A Study of an Encapsulated Cell Technology (ECT) Implant for Patients With Atrophic Macular Degeneration
Nonexudative Age-Related Macular Degeneration, Unspecified Eye, Intermediate Dry Stage
Bottom Line
View on ClinicalTrials.gov: NCT00447954 ↗Enrolled (actual)
53
Serious AEs
23.5%
Results posted
Mar 2025
Primary outcome: Primary: BCVA Response Defined as an Increased in 10 Letters at 1 Year Post-implant — 3; 3; 1; 9 eyes
Study Design & Population
- Study type
- Interventional
- Phase
- Phase 2
- Interventions
- High Dose NT-501 implant (Combination_product); Low Dose NT-501 implant (Combination_product); Sham (Other)
- Age
- Adult, Older Adult · 50+ yrs
- Sex
- All
- Sponsor
- Neurotech Pharmaceuticals
- Primary completion
- May 2009
Outcome Measures
| Outcome | Result | p-value |
|---|---|---|
| PRIMARY BCVA Response Defined as an Increased in 10 Letters at 1 Year Post-implant |
3; 3; 1; 9; 24; 11 | — |
| SECONDARY The Change in BCVA Over the 18-month Follow-up Period |
-0.1; 1.5; 1.4; 1.0; 2.9; 0.5 | — |
Summary
The purpose of this study is to look at the safety and effectiveness of CNTF implants on vision in participants with atrophic macular degeneration. This research is being done because there are no effective therapies for people with atrophic macular degeneration. Age-related macular degeneration (AMD) is a condition that affects the macula, the central part of the retina that we use for seeing details. There are two types of AMD, one is the wet type in which new blood vessels grow, also known as choroidal neovascularization (CNV), but the other is the dry type in which the healthy cells die, and that is the target of this study. This is called atrophic macular degeneration. The implant is a small capsule that contains human retinal pigment epithelium cells. These cells have been given the ability to make CNTF and release it through the capsule membrane into the surrounding fluid. In this study, two different CNTF dose levels will be used: a high dose and a low dose, as well as a sham surgery (or placebo) group.
Eligibility Criteria
Study inclusion criteria:
- To participate in this study, the participant had to understand and sign the protocol's informed consent (if the participant's vision was impaired to the point where it was not possible to read the informed consent document, the informed consent document was read in its entirety to the participant).
- Women of childbearing potential (women with last menses or = 4 weeks at a time) for ocular medications or had disease(s), that in the judgment of the examining physician, were vision threatening or might affect the primary outcome (artificial tears were permitted).
- Participant had evidence of classic or occult choroidal neovascularization in either eye, which might include serous RPE detachment, stippling on a fluorescein angiogram, macular edema, evidence of hemorrhage and lipid, and disciform scar.
- Participant had a requirement for acyclovir and/or related products during study duration. To be eligible for this study, the participant had to discontinue use of these products prior to enrollment and could not continue with the products until after they had completed the study.
- Participant had evidence of central serous chorio-retinopathy (CSR) in either eye.
- Participant had evidence of pathologic myopia in either eye.
- Participant had evidence of pseudovitelliform macular degeneration (a dominantly inherited disease characterized by a round or oval yellow subretinal macular deposit) in either eye.
- Participant was receiving systemic steroids or other immunosuppressive medications.
- Participant with evidence of vitreo-retinal traction maculopathy in either eye.
- Participant had a history of laser, photodynamic therapy (PDT), intravitreal injection of antivascular endothelial growth factor (VEGF) agent, or any previous treatment for AMD other than AREDS or equivalent supplement formulation.
- Prior history of vitrectomy, penetrating keratoplasty, trabeculectomy or trabeculoplasty.
- Participant had any of the following lens opacities: cortical opacity > standard 3, posterior subcapsular opacity > standard 3, or a nuclear opacity > standard 3 as measured on the AREDS clinical lens grading system.
- Participant had undergone lens removal in the last 3 months.
- Participant had participated in any other clinical trial of a drug or within the last 6 months.
- Participant was on chemotherapy.
- Participant was on ocular or systemic medications known to be toxic to the lens, retina, or optic nerve.
- Participant was pregnant or lactating.
- Participant had other retinal disease(s).
- Participant had a history of malignancy, except study participants with a history of successfully treated cancer (≥5 years prior to inclusion in the trial).
- Participant was considered immunodeficient or had a known history of HIV.
- Participant with a history of ocular herpes zoster.
- Participant's fellow eye visual acuity worse than 20/400.
- Participant had undergone LASIK surgery or other refractive surgery for either eye in less than 6 months prior to screening.
- Participants with severe hearing disabilities in both ears.
- Participants with unmanaged diabetes, patients with CME, or retinopathy in either eye.
- Participant had a history of retinal detachment in either eye.
- Participant who had been diagnosed and treated for amblyopia as an infant.
- Participant with a history of Pars Plana Vitrectomy.
Data sourced from ClinicalTrials.gov (NCT00447954). Outcome figures and adverse-event rates are extracted automatically from the registry's posted results and are provided for clinician reference, not as a substitute for the primary publication.