Topical Interferon Gamma-1b for Central Serous Chorioretinopathy

Phase 1

Completed

Conditions: Retinal Disease
Macular Disease

Interventions: Drug: Interferon gamma-1b

Registration Number: NCT01468337

Lead Sponsor: National Eye Institute (NEI)

Brief Summary: Background:

- In the eye disease central serous chorioretinopathy (CSC), fluid collects under the retina at the back of the eye. CSC can resolve on its own, but in some people it lasts for several months or can come back. The fluid buildup during CSC can cause vision loss. The drug interferon gamma-1b can help reduce fluid accumulation in the retina. Researchers want to see if interferon gamma-1b can help treat and prevent vision loss from CSC.

Objectives:

- To see if interferon gamma-1b eye drops are a safe and effective treatment for CSC.

Eligibility:

- Individuals at least 18 years of age who have CSC in at least one eye.

Design:

* Participants will be screened with a physical exam and medical history. They will also have an eye exam and blood tests.

* This study will require at least ten visits to the National Institutes of Health eye clinic over a total of 52 weeks (one year). Most visits will last up to 4 hours.

* Participants will return to the eye clinic 2 days after the first visit and 1, 2, 4, 8, 12, 24, 36 and 48 weeks after starting the study eye drops. These visits will involve blood tests and eye exams.

* Participants will receive the study eye drops at the initial visit. The drops must be used three or four times a day for 2 weeks. They must be stored in a cool place (like a refrigerator). The doses will follow an escalation schedule with the first participant receiving 2 drops three times a day and the last participant receiving 4 drops four times a day. To maximize safety, the most-recently enrolled participant will complete Week 4 before the next participant can enroll (e.g., the second enrolled participant will not be enrolled until the first has completed the Week 4 visit).

* If the CSC does not improve after the first 2 weeks, participants will receive another 2 weeks of eye drops. This set of drops will start 4 weeks after the initial study visit.

* If the CSC does not improve after the 8-week study period, participants may receive additional eye drops at the maximum dose of 4 drops four times daily.

* The study will end for each participant at one year (48 weeks after the initial study visit).

Detailed Description: Objective: Central serous chorioretinopathy (CSC) is a retinal disorder characterized by an accumulation of serous fluid under the retina thought to be due to excessive choroidal hyperpermeability. The retinal pigment epithelium (RPE) plays a critical role in removing fluid from the subretinal space. This RPE "pump" is believed to be a key player in the reabsorption of subretinal fluid and maintenance of retinal attachment. Fluid transport assays have examined whether interferon gamma induces changes in fluid transport across human fetal RPE monolayers and showed an increase in fluid absorption from the retinal to the choroidal side of the tissue. An in vivo rodent model of retinal detachment has been used to measure the effect of interferon gamma on re-absorption following retinal detachment and showed that the addition of interferon gamma to the anterior eye surface caused a significant, rapid decrease in retinal detachment volume in the first hour of observation. This pilot study will investigate the safety, tolerability and potential efficacy of serial ocular instillations of topical interferon gamma-1b for classic CSC.

Study Population: Five participants with subretinal fluid due to classic CSC will initially be enrolled. However, up to an additional two participants may be enrolled in order to obtain the five participants to be included in the analysis if any participants withdraw from the study.

Design: In this Phase I/II, non-randomized, prospective, uncontrolled, dose-escalation, single-center pilot study, a series of ocular instillations of topical interferon gamma-1b will be administered in the study eye over a two-week period. If the fluid re-accumulates or increases, participants will be eligible for re-challenging with topical interferon gamma-1b in the study eye at Week 4. Participants will be followed for one year. Participants may be eligible for additional re-challenges after the initial eight week study period ends if their fluid re-accumulates or increases further.

Outcome Measures: The primary outcome measure related to the safety and tolerability of serial ocular instillations of topical interferon gamma-1b will be assessed by the number and severity of adverse events (AEs) related to the investigational product and the number of withdrawals. Secondary efficacy outcomes include changes in best-corrected visual acuity (BCVA), central retinal thickness and maximum lesion volume as measured on optical coherence tomography (OCT), leakage as observed on fluorescein angiograms (FA), autofluorescence patterns as observed on fundus autofluorescence (FAF) imaging and mean macular sensitivity as assessed by microperimetry.

Recruitment & Eligibility

Status: COMPLETED

Sex: All

Target Recruitment: 5

Inclusion Criteria

Not provided

Exclusion Criteria

Not provided

Study & Design

Study Type: INTERVENTIONAL

Study Design: SINGLE_GROUP

Arm && Interventions

Group	Intervention	Description
Interferon gamma-1b	Interferon gamma-1b	Interferon gamma-1b (Actimmune®, InterMune, Inc, Brisbane, CA 94005) was supplied to participants in single-use dropperettes. A single dropperette contains 1 mL of topical interferon gamma-1b (Actimmune®) at a concentration of 200 µg/mL, which is equivalent to 28 drops. Each drop provides a dose of 7 µg of investigational product. All participants will receive interferon gamma-1b for two weeks. Doses of interferon gamma-1b eye drops will be escalated among participants during this initial 2-week period; however, additional doses will be dispensed to participants if needed at Week 4 or after the initial 8-week study period. Participants eligible for additional doses after 8 weeks will be administered the maximum dose of 4 drops 4 times daily for a total daily dose of 112 μg.

Primary Outcome Measures

Name	Time	Method
Total Number of Severe Ocular Adverse Events Related to the Investigational Product	Week 48
Total Number of Ocular Adverse Events Related to Investigational Product	Week 48
Total Number of Severe Non-ocular Adverse Events Related to the Investigational Product	Week 48
Total Number of Non-ocular Adverse Events Related to the Investigational Product	Week 48
Number of Participants Who Withdrew From the Study	Week 48

Secondary Outcome Measures

Name	Time	Method
Changes in the Maximum Subretinal Fluid Volume as Measured on Optical Coherence Tomography (OCT) at Week 2 Compared to Baseline	Baseline and Week 2
Changes in Leakage as Observed on Fluorescein Angiography (FA) at Week 48 Compared to Baseline	Baseline and Week 48
Changes in the Autofluorescence Patterns as Observed on Fundus Autofluorescence (FAF) Imaging at Week 48 Compared to Baseline	Baseline and Week 48
Changes in Best-corrected Visual Acuity (BCVA) in the Fellow Eye at Week 2 Compared to Baseline	Baseline and Week 2	Visual acuity was measured using the Early Treatment Diabetic Retinopathy Study (ETDRS) protocol. Acuity is measured as letters read on an ETDRS eye chart and the letters read equate to Snellen measurements. For example, if a participant reads between 84 and 88 letters, the equivalent Snellen measurement is 20/20. A positive change value indicates improvement of the outcome. A negative change value indicates worsening of the outcome.
Changes in the Autofluorescence Patterns as Observed on Fundus Autofluorescence (FAF) Imaging at Week 2 Compared to Baseline	Baseline and Week 2
Changes in Mean Macular Sensitivity as Assessed by Microperimetry at Week 2 Compared to Baseline	Baseline and Week 2
Changes in Best-corrected Visual Acuity (BCVA) in the Study Eye at Week 2 Compared to Baseline	Baseline and Week 2	Visual acuity was measured using the Early Treatment Diabetic Retinopathy Study (ETDRS) protocol. Acuity is measured as letters read on an ETDRS eye chart and the letters read equate to Snellen measurements. For example, if a participant reads between 84 and 88 letters, the equivalent Snellen measurement is 20/20. A positive change value indicates improvement of the outcome. A negative change value indicates worsening of the outcome.
Changes in Best-corrected Visual Acuity (BCVA) in the Study Eye at Week 48 Compared to Baseline	Baseline and Week 48	Visual acuity was measured using the Early Treatment Diabetic Retinopathy Study (ETDRS) protocol. Acuity is measured as letters read on an ETDRS eye chart and the letters read equate to Snellen measurements. For example, if a participant reads between 84 and 88 letters, the equivalent Snellen measurement is 20/20. A positive change value indicates improvement of the outcome. A negative change value indicates worsening of the outcome.
Changes in Best-corrected Visual Acuity (BCVA) in the Fellow Eye at Week 48 Compared to Baseline	Baseline and Week 48	Visual acuity was measured using the Early Treatment Diabetic Retinopathy Study (ETDRS) protocol. Acuity is measured as letters read on an ETDRS eye chart and the letters read equate to Snellen measurements. For example, if a participant reads between 84 and 88 letters, the equivalent Snellen measurement is 20/20. A positive change value indicates improvement of the outcome. A negative change value indicates worsening of the outcome.
Changes in Central Retinal Thickness as Measured on Optical Coherence Tomography (OCT) at Week 2 Compared to Baseline	Baseline and Week 2
Changes in Leakage as Observed on Fluorescein Angiography (FA) at Week 2 Compared to Baseline	Baseline and Week 2
Changes in the Maximum Subretinal Fluid Volume as Measured on Optical Coherence Tomography (OCT) at Week 48 Compared to Baseline	Baseline and Week 48
Changes in Central Retinal Thickness as Measured on Optical Coherence Tomography (OCT) at Week 48 Compared to Baseline	Baseline and Week 48
Changes in Mean Macular Sensitivity as Assessed by Microperimetry at Week 48 Compared to Baseline	Baseline and Week 48