# Pfizer's Tilrekimig Posts Positive Phase 2, Sparking IL-4/13/TSLP Drug Race

- slug: pfizers-tilrekimig-posts-positive-phase-2-sparking-il-413tslp-drug-race
- date: 2026-04-07
- category: Biotech & Life Sciences

Pfizer opened the floodgates with a clean Phase 2 readout. Sanofi just became the first runner to stumble in the IL-4/13 bispecific gold rush — and the field is moving fast enough that nobody is waiting to find out if it is alone.

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