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    Prior vitrectomy does not affect DME therapy with ranibizumab, laser

    In the long term, both vitrectomized and nonvitrectomized groups showed similar results

     

    Post hoc exploratory analysis

    This is what led to the post hoc exploratory analysis of patients with or without prior vitrectomy assigned to intravitreous ranibizumab with prompt or deferred laser. Investigators analyzed visual acuity, OCT central subfield thickness, OCT volume, and the number of injections from baseline through 3 years. There were 336 eyes in the nonvitrectomized group and 25 in the vitrectomized group.

    “Baseline characteristics were balanced between vitrectomy status groups with respect to subject-level demographic, medical history, and diabetes-related factors, including age, diabetes type, pre-existing cardiovascular disease, and hemoglobin A1c,” Dr. Wells said.

    That said, there were some eye-related factors that were imbalanced and that related to diabetic retinopathy and DME severity, he added.

    Seven baseline characteristics may have affected the outcomes, including visual acuity, prior DME treatment, prior anti-VEGF for DME, lens status, diabetic retinopathy severity, OCT central subfield thickness and volume, and randomized assignment to the ranibizumab plus prompt or deferred laser group, Dr. Wells said.

    Ultimately, the study showed that in the means-adjusted results, both groups had a substantial improvement in vision that was sustained for 3 years.

    “Eyes with prior vitrectomy initially did slightly better but at 1 and 3 years, the points crossed and there was no statistically significant difference between the groups,” Dr. Wells said.

    Although changes in early and sustained reduction in OCT thickness were less notable in the prior vitrectomy group, the only significant difference was at week 20. By 1, 2, and 3 years, there was no significant difference in reduction in OCT central subfield thickness or volume, he explained.

    Both groups required a median of 13 injections over a 3-year period, with no additional treatment burden in the nonvitrectomized eyes. The need for injections declined from the first year in both groups to a median of 2 in the second year and a median of 1 in the third year.

    However, eyes with DME require continued monitoring as the study showed DME can recur after the first year of treatment, he added.

    Some study limitations include the small number of cases with vitrectomy, the fact that it is a post-hoc study, and a number of potential confounding factors.

     

    John A. Wells III, MD, FACS

    E: [email protected]

    This article was adapted from Dr. Wells’ presentation at the 2014 meeting of the American Academy of Ophthalmology. He did not indicate any proprietary interest in the subject matter.

     

     

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