Kalaris Therapeutics Inc. announced positive initial results from its Phase 1a single ascending dose trial of TH103, a fully humanized recombinant fusion protein targeting VEGF, in treatment-naïve patients with neovascular age-related macular degeneration (nAMD). The data showed a mean 10-letter gain in visual acuity and rapid, robust anatomic improvement at one month following a single injection. TH103 was generally well tolerated, and pharmacokinetic analysis indicated a 27 to 51-fold lower plasma Cmax compared to current leading agents, suggesting increased intraocular retention. The results were presented during a live webcast and conference call on December 17, 2025. Kalaris is continuing enrollment in an ongoing Phase 1b/2 multi-ascending dose study, with preliminary efficacy and safety data expected in the second half of 2026.