Stapokibart (CM310): A review in seasonal allergic rhinitis.

BACKGROUND

Stapokibart (CM310), a humanized anti-IL-4Rα monoclonal antibody, blocks IL-4/IL-13 signaling for type 2 inflammatory diseases like seasonal allergic rhinitis (SAR), where standard of care often fails.

OBJECTIVE

Assess stapokibart's efficacy on the primary endpoint (reflective Total Nasal Symptom Score, rTNSS) and safety as add-on therapy in SoC-inadequate moderate-to-severe SAR.

METHODS

Data from a Phase II trial (MERAK, n = 92) and the pivotal Phase III PHECDA trial (n = 108; enriched for blood eosinophils ≥300 cells/μL) were reviewed. Patients received subcutaneous stapokibart (600 mg loading, then 300 mg Q2W) or placebo + SoC for 4 weeks.

RESULTS

In MERAK, stapokibart Q2W showed a trend for rTNSS improvement (LSMD -1.0 vs placebo, p = 0.065). In PHECDA, stapokibart significantly improved rTNSS at Week 4 (LSMD -1.7, 95 % CI: -2.5, -0.8; p = 0.0002). Treatment-emergent adverse event rates were comparable to placebo in both trials (e.g.

, PHECDA: 52.0 % vs 46.6 %), mostly mild/moderate.

CONCLUSION

Add-on stapokibart is a valuable therapeutic option for adults with SoC-inadequate moderate-to-severe SAR and elevated eosinophils, providing statistically significant improvements in nasal symptoms and quality of life, with an acceptable safety profile.