Regeneron Pharmaceuticals (REGN) stock crashed Monday after its experimental melanoma treatment failed in Phase 3 testing, leading at least 10 analysts to cut their price targets. The company aimed to show improvement in progression-free survival, or PFS, in patients with never-before-treated metastatic melanoma. Fianlimab recipients had a 5.1-month improvement in PFS — how long they lived before their cancer progressed.…

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