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Strong Phase 2 efficacy signals (56% AAER reduction) and a clear Phase 3 path with quarterly dosing could de-risk development and attract upside if Phase 3 confirms benefits; however, real upside hinges on Phase 3 outcomes and regulatory timing, so results beyond 2027 remain uncertain.
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Upstream Bio reported Phase 2 VALIANT results for verekitug, a TSLP receptor antagonist, with a 56% reduction in annualized asthma exacerbations at 100 mg q12 weeks and improvements in FEV1 and FeNO along with a favorable safety profile. The company reaffirmed plans to initiate Phase 3 for severe asthma and CRSwNP in Q1 2027 using a 400 mg quarterly regimen, aiming for best-in-class efficacy and at-home dosing convenience.
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