Pexidartinib: First Approval

Pexidartinib (TURALIO™) is an orally administered small molecule tyrosine kinase inhibitor with selective activity against the colony-stimulating factor 1 (CSF1) receptor, KIT proto-oncogene receptor tyrosine kinase (KIT) and FMS-like tyrosine kinase 3 harboring an internal tandem duplication mutation (FLT3-ITD). In August 2019, the US FDA approved pexidartinib capsules for the treatment of adult patients with symptomatic tenosynovial giant cell tumor (TGCT) associated with severe morbidity or functional limitations and not amenable to improvement with surgery. This approval was based on positive results from the phase III ENLIVEN trial. Pexidartinib is being investigated in various malignancies as monotherapy or combination therapy. This article summarizes the milestones in the development of pexidartinib leading to its first approval for TGCT.

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