Purpose: To investigate the influence of glycosylated hemoglobin (HbA1c) on treatment outcomes in patients with diabetic macular edema (DME) receiving intravitreal ranibizumab.
Design: Post hoc analysis of 2 identical phase III clinical trials assessing the efficacy and safety of intravitreal ranibizumab in DME over 36 months (RIDE: NCT00473382/RISE: NCT00473330).
Participants: A total of 483 adults with vision loss from DME treated with ranibizumab were included in this analysis from RIDE/RISE. Participants received monthly intravitreal ranibizumab (0.3 or 0.5 mg).
Main Outcome Measures: Differences in visual and anatomic outcomes, and diabetic retinopathy (DR) severity score, between subgroups of patients with baseline HbA1c ≤7% versus HbA1c >7% at 36 months.
Results: There were 195 patients in RIDE/RISE who were treated with ranibizumab with a baseline HbA1c ≤7% and 288 patients with a baseline HbA1c >7% included in this analysis. The mean improvement in visual acuity (VA) at 36 months was +13 Early Treatment Diabetic Retinopathy Study (ETDRS) letters in patients with baseline HbA1c ≤7% compared with +11 ETDRS letters in the patients with a baseline HbA1c >7% (P = 0.17). After adjustment for baseline central foveal thickness (CFT) and duration of diabetes, the mean CFT reduction was -268 μm in patients with a baseline HbA1c ≤7% and -269 μm in patients with a baseline HbA1c >7% (P = 0.98; 95% confidence interval, -22.93 to 23.54). The proportion of patients with a ≥2-step improvement in DR severity score was 38% in patients with baseline HbA1c ≤7% compared with 41% in the patients with a baseline HbA1c >7% (P = 0.53). There was no correlation of baseline HbA1c with any visual or anatomic parameter.
Conclusions: The improvement in VA, anatomic reduction of macular edema, and improvement in DR severity score with ranibizumab treatment seem to be independent of baseline HbA1c.
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