• Healthy volunteers phase completed showing differentiating target engagement biomarker data and favorable safety data
• On track for top-line histology data in 2023 in Celiac Disease and Eosinophilic Esophagitis
• Proof-of-concept data of CALY-002 in humanized Atopic Dermatitis model supports “pipeline-in-a drug” value proposition

The SAD part of the study has been completed. Across the wide range of tested dose levels in Healthy Volunteers, CALY-002 was well tolerated, with a PK profile typical for IgG monoclonal antibodies. Importantly, target engagement (i.e., IL-15 blockade) was demonstrated through the reduction of NK cell numbers in blood, owing to the well-known role of IL-15 as a homeostatic factor for NK cells. CALY-002 is the first IL-15-specific antibody to demonstrate blood NK cell reduction in humans, underpinning its unique and differentiated profile.

The MAD part of the study in patients with Celiac Disease or Eosinophilic Esophagitis is currently progressing into the highest dose cohorts. This phase investigates safety, PK, pharmacology, disease biomarkers and clinical efficacy endpoints including histology of multiple doses of CALY-002 or placebo over either an 8-week treatment period in a gluten-challenge setting (Celiac Disease) or a 12-week period of open label CALY-002 treatment (Eosinophilic Esophagitis). Top-line histology data will be generated in 2023 for both indications.

Further, CALY-002 was demonstrated to be active in a recently developed humanized model of Atopic Dermatitis, results presented at the 51^st European Society for Dermatological Research conference (Amsterdam, 28 September – 01 October 2022). These important data further highlight the potential of CALY-002 in multiple auto-immune indications.

Calypso Biotech Chief Medical Officer, Dr. Jos Houbiers, MD, PhD, comments “the demonstrated pharmacological efficacy highlights the potency of CALY-002 and is promising for the clinical histology results in the MAD parts of the study. New and improved treatments are much needed for Celiac Disease and Eosinophilic Esophagitis patients who have limited treatment options. For patients with celiac disease, clinical practice learns that adherence to a gluten-free diet is very difficult and many patients continue to experience symptoms; in asymptomatic patients, histological damage to the small intestine can be present unnoticed, studies show.’’