Abstract:
OBJECTIVE:To evaluate the safety and tolerability of a single subconjunctival (SCJ) or intravitreal (IVT) injection of an ophthalmic sirolimus formulation in eyes with diabetic macular edema (DME). DESIGN:Randomized, open-label, dose-escalating phase I study. PARTICIPANTS:Fifty eyes among 50 patients with DME, retinal thickness ≥ 300 microns and best-corrected visual acuity (BCVA) 20/40 to 20/200. METHODS:A single dose of sirolimus administered SCJ (220, 440, 880, 1320, or 1760 μg) or IVT (44, 110, 176, 264, or 352 μg) on day 0; observation through day 90. MAIN OUTCOME MEASURES:Primary end points were the frequency and severity of ocular and systemic adverse events. Secondary end points were changes in BCVA and retinal thickness. RESULTS:No dose-limiting toxicities were observed and ocular adverse events were mostly mild and transient. Conjunctival hyperemia, hemorrhage, and edema were common after the SCJ injection procedure and conjunctival hemorrhage was common after the IVT injection procedure. Three patients experienced ocular adverse events considered possibly related to study drug: Conjunctival edema and reduced visual acuity were reported in 1 SCJ patient each and iritis was reported in 1 IVT patient. No serious ocular adverse events were reported. No nonocular adverse events were considered related to study drug. Systemic exposure to sirolimus was low, with blood concentrations below levels necessary for systemic immunosuppression. For the SCJ group (n = 25), a median increase in BCVA started at day 7 (5.0 letters) and was 3.0, 4.0, and 4.0 letters at days 14, 45 and 90, respectively. At day 45, median decrease in retinal thickness was -23.7 μm. For the IVT group (n = 25), the median increase in BCVA was 2.0 letters at day 7; at days 14, 45, and 90, the median increase was maintained (4.0 letters); the median decrease in retinal thickness was -52.0 μm at day 45. CONCLUSIONS:Locally administered sirolimus was well-tolerated with minimal systemic exposure at all doses tested in this small phase I population. These findings support advancing the present sirolimus formulation into phase II studies. FINANCIAL DISCLOSURE(S):Proprietary or commercial disclosure may be found after the references.
journal_name
Ophthalmologyjournal_title
Ophthalmologyauthors
Dugel PU,Blumenkranz MS,Haller JA,Williams GA,Solley WA,Kleinman DM,Naor Jdoi
10.1016/j.ophtha.2011.07.034subject
Has Abstractpub_date
2012-01-01 00:00:00pages
124-31issue
1eissn
0161-6420issn
1549-4713pii
S0161-6420(11)00688-9journal_volume
119pub_type
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