Retina Expert Brief

Merck Phase 2b/3 MALBEC Trial for nAMD

Merck Phase 2b/3 MALBEC Trial for nAMD

Key Questions

What is the MALBEC trial?

The MALBEC trial is Merck's pivotal Phase 2b/3 study evaluating MK-8748 (Tiespectus), a bispecific Tie2 agonist/VEGF inhibitor, for neovascular age-related macular degeneration (nAMD). It compares the therapy against aflibercept dosed every 8 weeks, aiming for a more durable treatment following the RIOJA study.

What is MK-8748 (Tiespectus)?

MK-8748, also known as Tiespectus, is an investigational bispecific antibody that acts as a Tie2 agonist and VEGF inhibitor. It is being developed by Merck to provide longer-lasting therapy for nAMD patients.

What is the current status of the MALBEC trial?

Merck has announced the initiation of the pivotal Phase 2b/3 MALBEC trial. The study is advancing as part of efforts to develop a durable nAMD therapy.

Merck advancing pivotal Phase 2b/3 MALBEC for MK-8748 (Tiespectus), bispecific Tie2/VEGF vs aflibercept q8w, targeting durable nAMD therapy post-RIOJA.

Sources (2)
Updated Apr 8, 2026
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