Guide on ‘Wet Age’ Macular Degeneration Drugs

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FDA has released a draft guidance entitled “Neovascular Age-Related Macular Degeneration: Developing Drugs for Treatment.” The document provides recommendations to sponsors regarding eligibility criteria, trial design considerations, and efficacy endpoints to enhance clinical trial data quality and improve efficiencies in drug development programs.

The guidance recommends a parallel-group, randomized by patient, double-masked trial design in which the investigational drug group demonstrates superiority over the control group. Trials should include patients aged 50 and older who have choroidal neovascularization documented by fundus photography, fluorescein angiography, or optical coherence tomography. “For a trial designed as a superiority trial, the sponsor should enroll patients with neovascularization caused by age-related macular degeneration who have had visual loss or would be expected to develop visual loss,” it says.

Regarding efficacy considerations, FDA says one eye per patient should be prespecified as the study eye for the purposes of the efficacy assessment even if both eyes are treated. The guidance includes several primary endpoint measurement options, such as “a statistically significant smaller percentage of patients with a doubling of the visual angle in best corrected distance visual acuity at nine months or later after the start of drug administration in the investigational drug treatment group compared to the control group.”

To fulfill safety data objectives, the document recommends 400 or more patients using the investigational drug at a dose at least as high as that proposed for marketing. It also says that before submitting an NDA, patients should have completed at least nine months of follow-up after treatment initiation. Additionally, FDA recommends that at least one concurrently controlled safety trial be conducted for at least two years.

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