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AstraZeneca, Daiichi's breast cancer drug gets FDA nod as first-line treatment

ENHERTU with pertuzumab reduces disease progression risk by 44% and extends median progression-free survival beyond three years, based on DESTINY-Breast09 trial data.

  • Following late‑breaking ASCO25 data, the FDA approved AstraZeneca and Daiichi Sankyo's ENHERTU with pertuzumab as first-line treatment for unresectable or metastatic HER2-positive breast cancer, using expedited pathways.
  • DESTINY-Breast09 phase 3 data showed a 44% reduction in risk of progression or death versus THP, median progression-free survival of 40.7 months, and an 87% confirmed objective response rate among 1,157 patients.
  • Clinical trial safety findings include boxed warnings for interstitial lung disease /pneumonitis and embryo-fetal toxicity, with ILD in 12% and fatal ILD/pneumonitis in 0.5%.
  • Clinicians could adopt the regimen as a new first-line standard, while AstraZeneca will pay Daiichi Sankyo a $150 million milestone and both commit to U.S. patient access and support programs.
  • Project Orbis is coordinating concurrent reviews in Switzerland and Japan, while continued approval may require confirmatory trial verification; ENHERTU is key to Daiichi Sankyo and AstraZeneca collaboration.
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cancernetwork.com broke the news in on Monday, December 15, 2025.
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