University Of Tasmania
140184 - clinical outcomes of a treat and extend regimen.pdf (861.8 kB)
Download file

Clinical outcomes of a treat and extend regimen with intravitreal aflibercept injections in patients with diabetic macular edema: Experience in clinical practice

Download (861.8 kB)
journal contribution
posted on 2023-05-20, 16:34 authored by Curry, BA, Sanfilippo, PG, Chan, S, Alexander HewittAlexander Hewitt, Nitin VermaNitin Verma

Introduction: Treat-and-extend (T&E) and pro re nata (PRN; ‘as needed’) regimens of intravitreal anti-vascular endothelial growth factor (VEGF) treatment have been found to reduce the injection burden on patients and improve the cost effectiveness of the treatment of macular edema. The aim of this study was to assess the effectiveness of a T&E regimen of aflibercept, in a clinical setting, in patients with diabetic macular edema (DME) who were either intravitreal anti-VEGF therapy naive or with minimal exposure to anti-VEGF (B 6 treatments) in the previous 12 months.

Methods: This prospective, single arm, open label study recruited patients with DME (macular thickness of C 300 lm) and best-corrected visual acuity (BCVA) between 28-78 ETDRS letters. Participants received five loading doses of intravitreal aflibercept at 4-weekly intervals. BCVA measurements and macular optical coherence tomography were performed at each visit. If no disease activity was detected, treatment intervals were increased by 2 weeks to a maximum of 12 weeks. Outcome measures included: changes in BCVA and retinal anatomical measures (central foveal thickness [CFT] and central macular volume within 6 mm of the fovea [CSVol]) between baseline and 2 years, patient treatment intervals; and adverse events.

Results: Of the 36 patients who provided informed consent to participate in the study and were screened, 26 patients (eyes) were eligible to participate in the study. After regression analysis, adjustment for repeated measures, and significant covariates, the mean BCVA increased by 3.8 letters (95% confidence interval [CI] 1.1, 6.4) and the CFT and CSVol decreased by 127.2 lm (95% CI 91.7, 162.5) and 1.6 mm3 (95% CI 1.2, 2.0), respectively, over the course of the study. In the second year, 16 of the 25 patients still participating had their treatment intervals extended to 12 weeks. There was no evidence of any new adverse events that would require changes to the aflibercept safety profile.

Conclusion: For the majority of patients presenting with DME, a T&E regimen of aflibercept in the first 2 years of therapy is a practical alternative to PRN treatment with regular review.


Publication title

Ophthalmology and Therapy








Menzies Institute for Medical Research


Adis International Ltd.

Place of publication

New Zealand

Rights statement

Copyright The Author(s) 2019 This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (, which permits any noncommercial use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

Repository Status

  • Open

Socio-economic Objectives

Expanding knowledge in the health sciences