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Kalaris Therapeutics Reports Positive Phase 1a Data for TH103 in Neovascular AMD Treatment

Kalaris Therapeutics (KLRS) | December 17, 2025

By Uma Mitchell

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Kalaris Therapeutics announces positive initial data from Phase 1a trial of TH103 for neovascular age-related macular degeneration (nAMD)

TH103 shows significant visual and anatomic improvements in treatment-naïve patients

The engineered properties of TH103 demonstrate potential for extended treatment durability

Mean 10-Letter Gain in Visual Acuity

TH103 showed a mean 10-letter improvement in best-corrected visual acuity after a single injection

Enhanced Intraocular Retention

TH103 exhibited 27 to 51-fold lower plasma Cmax compared to current leading agents, indicating increased intraocular retention

No Dose-Limiting Toxicities

TH103 was generally well tolerated with no dose-limiting toxicities or serious adverse events observed

  • TH103's molecular design and preclinical profile supported by robust visual and anatomic improvements
  • Positive results indicate potential for extended treatment durability with reduced systemic exposure
  • Initial data suggests TH103's engineered properties may offer long-term benefits to nAMD patients

The promising Phase 1a data for TH103 support Kalaris Therapeutics' innovative approach in developing effective treatments for retinal diseases. With enhanced potency and intraocular retention, TH103 shows great potential for improving vision and patient outcomes in nAMD.