Spyre Therapeutics Announces Positive Interim Phase 1 Results for SPY001, Supporting Potential Quarterly or Biannual Dosing

SYRE
October 04, 2025

Spyre Therapeutics, Inc. announced positive interim Phase 1 data from its first-in-human trial of SPY001, an investigational anti-α4β7 antibody for inflammatory bowel disease (IBD). The data, as of October 30, 2024, showed SPY001 was well tolerated with a favorable safety profile across all dose groups.

Pharmacokinetic (PK) data demonstrated a half-life of over 90 days, which is approximately four-fold greater than vedolizumab's estimated 25-day human half-life. This extended half-life supports the potential for maintenance dosing via a single subcutaneous injection on a quarterly (Q3M) or biannual (Q6M) basis.

Pharmacodynamic (PD) data indicated complete saturation of α4β7 receptors with a single 300 mg dose through Week 12, the longest follow-up available. Based on these results, Spyre plans to initiate a Phase 2 platform trial in ulcerative colitis in mid-2025, which will include SPY001, SPY002, SPY003, and combinations.

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