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