Conbercept for Treatment of Neovascular Age-related Macular Degeneration: Results of the Randomized Phase 3 PHOENIX Study

PHOENIX Study Group

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Purpose: Age-related macular degeneration (AMD) can cause irreversible vision loss leading to blindness. We aim to evaluate the efficacy and safety of intravitreal injections of 0.5 mg conbercept, a new anti–vascular endothelial growth factor (anti-VEGF) drug, for treatment of AMD on a schedule more manageable for patients. Design: A prospective, double-masked, multicenter, sham-controlled, phase III randomized trial. Methods: PATIENTS: Patients with choroidal neovascularization (CNV) secondary to AMD were enrolled and randomized to the conbercept group or the sham control group. INTERVENTION: The conbercept group received intravitreal injections of conbercept (0.5 mg) once monthly for the first 3 months, then once quarterly until month 12 (3 + Q3M). The sham group received first 3 monthly sham injections and then 3 monthly injections of conbercept (0.5 mg) followed by quarterly administrations until month 12. MAIN OUTCOME MEASURES: The primary endpoint was mean change from baseline in best-corrected visual acuity (BCVA) at month 3. Results: A total of 114 patients (91.9%) from 9 sites in China completed the 12-month study. At the 3-month primary endpoint, the mean changes in BCVA from baseline were +9.20 letters in the conbercept group and +2.02 letters in the sham group, respectively (P <.001). At 12 months, the mean changes from baseline in BCVA letter score were +9.98 letters in the conbercept group and +8.81 letters in the sham group (P =.64). The most common ocular adverse events were associated with intravitreal injections, such as conjunctival hemorrhage, and increased intraocular pressure. Conclusions: A conbercept dosing regimen of 3 initial monthly administrations followed by quarterly treatments is effective for treatment of AMD. In previous reports, other anti-VEGF agents were unable to maintain similar clinical benefits with the same regimen.

Original languageEnglish (US)
Pages (from-to)156-167
Number of pages12
JournalAmerican journal of ophthalmology
StatePublished - Jan 1 2019


ASJC Scopus subject areas

  • Ophthalmology

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