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Post-approval, manufacturers may modify an approved new or generic drug product. Such modifications can encompass alterations in the Active Pharmaceutical Ingredient (API), manufacturing process, formulation, batch size, manufacturing site, and container closure system (FDA Guidance for Industry, April 2004). Often, a drug product may undergo multiple changes.These modifications require careful evaluation to determine their potential impact on the drug product's identity, strength, quality,...
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Pexidartinib is a new oral targeted therapy approved for tenosynovial giant cell tumors (TGCT) unresponsive to surgery. The FDA approval followed positive results from the ENLIVEN phase III trial, marking a milestone in TGCT treatment.

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Area of Science:

  • Oncology
  • Pharmacology
  • Molecular Biology

Background:

  • Tenosynovial giant cell tumor (TGCT) is a rare neoplastic proliferation that can cause severe morbidity and functional limitations.
  • Surgical intervention is the primary treatment for TGCT but is not always feasible or effective.
  • Pexidartinib, a small molecule tyrosine kinase inhibitor, targets key signaling pathways implicated in TGCT pathogenesis.

Purpose of the Study:

  • To summarize the development of pexidartinib (TURALIO™).
  • To highlight the milestones leading to its FDA approval for TGCT treatment.
  • To provide an overview of pexidartinib's mechanism of action and clinical investigation.

Main Methods:

  • Review of preclinical data and clinical trial results, including the Phase III ENLIVEN trial.
  • Analysis of pexidartinib's selective inhibition of CSF1 receptor, KIT, and FLT3-ITD.
  • Summary of regulatory submission and approval process by the US FDA.

Main Results:

  • Pexidartinib demonstrated significant efficacy in adult patients with symptomatic TGCT.
  • The FDA approved pexidartinib capsules in August 2019 for TGCT treatment in patients not amenable to surgical improvement.
  • Positive outcomes from the ENLIVEN trial formed the basis for regulatory approval.

Conclusions:

  • Pexidartinib represents a significant therapeutic advancement for patients with TGCT.
  • The drug's targeted mechanism offers a new treatment option for this rare tumor.
  • Ongoing investigations explore pexidartinib's potential in other malignancies.