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– ALLEGRO 2b/3 trial met primary efficacy endpoint of improving scalp hair regrowth – Pfizer Inc. (NYSE: PFE) today announced positive top-line results from the Phase 2b/3 ALLEGRO trial evaluating oral once-daily ritlecitinib in patients with alopecia areata, an autoimmune disease driven by an immune attack on the hair follicles that causes hair loss on the scalp and can also affect the face and body. 1,2 Ritlecitinib 50 mg and 30 mg achieved the primary efficacy endpoint of the study, namely…












