The Effect of the Oral PKC β Inhibitor Ruboxistaurin on Vision Loss in Two Phase 3 Studies

DSpace/Manakin Repository

The Effect of the Oral PKC β Inhibitor Ruboxistaurin on Vision Loss in Two Phase 3 Studies

Citable link to this page

 

 
Title: The Effect of the Oral PKC β Inhibitor Ruboxistaurin on Vision Loss in Two Phase 3 Studies
Author: Sheetz, Matthew J.; Aiello, Lloyd Paul; Davis, Matthew D.; Danis, Ronald; Bek, Toke; Cunha-Vaz, Jose; Shahri, Nazila; Berg, Paul H.

Note: Order does not necessarily reflect citation order of authors.

Citation: Sheetz, Matthew J., Lloyd Paul Aiello, Matthew D. Davis, Ronald Danis, Toke Bek, Jose Cunha-Vaz, Nazila Shahri, and Paul H. Berg. 2013. The Effect of the Oral PKC β Inhibitor Ruboxistaurin on Vision Loss in Two Phase 3 Studies. Invest. Ophthalmol. Vis. Sci. 54, no. 3: 1750. doi:10.1167/iovs.12-11055.
Full Text & Related Files:
Abstract: Purpose.: To assess the effect of ruboxistaurin (RBX) on vision loss through a prospectively defined combined analysis of two phase 3 trials (MBDL and MBCU). Methods.: Patients in both of these 3-year randomized, placebo-controlled, double-masked trials had best-corrected Early Treatment Diabetic Retinopathy Study (ETDRS) visual acuity (VA) ≥ 75 letters (∼20/32 Snellen), ETDRS retinopathy level 20 to 47D (MBDL) or 35B to 53E (MBCU), and no prior panretinal or focal photocoagulation in at least one eye at baseline. Patients received oral placebo (N = 508 total from both studies) or RBX 32 mg/d (N = 520 total). Best-corrected ETDRS VA was measured at 6-month intervals for 3 years (MBDL) or for 18 to 48 months (MBCU). Sustained moderate visual loss (SMVL) was defined as a 15-letter or more reduction from baseline in VA sustained for a patient's last 6 months of study participation. Results.: In the combined studies (N = 1028 total), SMVL occurred in 4.4% of placebo- versus 2.3% of RBX-treated patients (P = 0.069). In patients with a minimum of 2 years of follow-up (N = 825 total), there was less SMVL in the RBX group (4.4% placebo versus 2.1% RBX, P = 0.045). Other VA-related measures (mean VA, contrast sensitivity, Visual Functioning Questionnaire 25 [VFQ-25]) either trended toward a benefit for RBX or were also statistically significant in favor of RBX. In contrast, diabetic macular edema (DME) morphology-related measures (occurrence of significant center of macula involvement, optical coherence tomography [OCT]-determined center of macula thickness, application of focal photocoagulation) did not show a consistent trend in favor of or against RBX. Conclusions.: SMVL data in a prospectively defined combined analysis from these two phase 3 trials suggest a magnitude of effect of RBX on vision loss similar to that seen in two prior studies (approximately 50% reduction above standard care). However, event rates were low and statistical significance was not achieved. (ClinicalTrials.gov numbers, NCT00133952, NCT00090519.)
Published Version: doi:10.1167/iovs.12-11055
Terms of Use: This article is made available under the terms and conditions applicable to Other Posted Material, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#LAA
Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:35773005
Downloads of this work:

Show full Dublin Core record

This item appears in the following Collection(s)

 
 

Search DASH


Advanced Search
 
 

Submitters