Prospective Trial of Treat-and-Extend versus Monthly Dosing for Neovascular Age-Related Macular Degeneration: TREX-AMD 1-Year Results.

Journal Article (Clinical Trial, Phase III;Multicenter Study;Journal Article)


To assess prospectively a treat-and-extend (TREX) management strategy compared with monthly dosing of intravitreal ranibizumab in treatment-naïve neovascular age-related macular degeneration (AMD) patients.


Phase IIIb, multicenter, randomized, controlled clinical trial.


Sixty patients with treatment-naïve neovascular AMD randomized 1:2 to monthly or TREX management.


Patients with Early Treatment Diabetic Retinopathy Study (ETDRS) best-corrected visual acuity (BCVA) from 20/32 to 20/500 (Snellen equivalent) were randomized to receive intravitreal 0.5 mg ranibizumab monthly or according to a TREX protocol. The TREX patients were treated monthly for at least 3 doses, until resolution of clinical and spectral-domain optical coherence tomography evidence of exudative disease activity; the interval between visits then was individualized according to a strict prospective protocol.

Main outcome measures

Mean ETDRS BCVA change from baseline.


At baseline, mean age was 77 years (range, 59-96 years), mean BCVA was 20/60 (Snellen equivalent), and mean central retinal thickness (CRT) was 511 μm. Fifty-seven eyes (95%) completed month 12, at which point mean BCVA improved by 9.2 and 10.5 letters in the monthly and TREX cohorts, respectively (P = 0.60). The mean number of injections administered through month 12 was 13.0 and 10.1 (range, 7-13) in the monthly and TREX cohorts, respectively (P < 0.0001). Among TREX patients, 7 (18%) were maximally extended, 4 (10%) demonstrated fluid at every visit, and at month 12, 18 (45%) had achieved an extension interval of 8 weeks or more; the mean maximum extension interval between injections after the first 3 monthly doses was 8.4 weeks (range, 4-12 weeks). Most TREX patients who demonstrated recurrent exudative disease activity (17/24 [71%]) were unable to extend beyond their initial maximum extension interval.


The TREX neovascular AMD management strategy used in this prospective, randomized, controlled trial resulted in visual and anatomic gains comparable with those obtained with monthly dosing.

Full Text

Duke Authors

Cited Authors

  • Wykoff, CC; Croft, DE; Brown, DM; Wang, R; Payne, JF; Clark, L; Abdelfattah, NS; Sadda, SR; TREX-AMD Study Group,

Published Date

  • December 2015

Published In

Volume / Issue

  • 122 / 12

Start / End Page

  • 2514 - 2522

PubMed ID

  • 26391465

Electronic International Standard Serial Number (EISSN)

  • 1549-4713

International Standard Serial Number (ISSN)

  • 0161-6420

Digital Object Identifier (DOI)

  • 10.1016/j.ophtha.2015.08.009


  • eng