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Inavolisib is a new PI3Kα inhibitor approved for advanced breast cancer. It targets PIK3CA mutations in patients resistant to endocrine therapy, offering a new treatment option.

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Area of Science:

  • Oncology
  • Pharmacology
  • Molecular Biology

Background:

  • Inavolisib is an orally administered phosphatidylinositol-3-kinase alpha (PI3Kα) inhibitor.
  • PI3Kα pathway is frequently dysregulated in various solid tumors, including breast cancer.
  • Endocrine resistance is a significant challenge in treating hormone receptor-positive (HR+) breast cancer.

Purpose of the Study:

  • To summarize the development milestones of inavolisib.
  • To highlight the first regulatory approval of inavolisib.
  • To detail the approved indication for inavolisib in breast cancer treatment.

Main Methods:

  • Review of preclinical and clinical development data for inavolisib.
  • Analysis of regulatory submission and approval processes.
  • Identification of key efficacy and safety findings supporting the approval.

Main Results:

  • Inavolisib received its first US FDA approval on October 10, 2024.
  • The approval is for combination therapy with palbociclib and fulvestrant.
  • Indicated for adults with endocrine-resistant, PIK3CA-mutated, HR+, HER2-negative, locally advanced or metastatic breast cancer.

Conclusions:

  • Inavolisib represents a significant advancement in targeted therapy for PIK3CA-mutated breast cancer.
  • The drug offers a new therapeutic strategy for patients with endocrine-resistant disease.
  • Ongoing regulatory reviews in the EU and other regions are anticipated.