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Culmerciclib: First Approval.

Yahiya Y Syed1

  • 1Springer Nature, Private Bag 65901, Mairangi Bay, Auckland, 0754, New Zealand. dru@adis.com.

Drugs
|May 24, 2026
PubMed
Summary
This summary is machine-generated.

Culmerciclib is a new oral CDK2/4/6 inhibitor approved in China for advanced HR+/HER2- breast cancer. It targets resistance mechanisms, offering a new treatment option for patients progressing after endocrine therapy.

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Area of Science:

  • Oncology
  • Pharmacology
  • Drug Development

Background:

  • Hormone receptor-positive, human epidermal growth factor receptor 2-negative (HR+/HER2-) advanced or metastatic breast cancer often develops resistance to standard endocrine therapy.
  • Cyclin-dependent kinases (CDKs) 2, 4, and 6 play crucial roles in cell cycle progression and are implicated in endocrine therapy resistance.
  • Targeting multiple CDKs simultaneously may offer a strategy to overcome resistance mechanisms in breast cancer.

Purpose of the Study:

  • To summarize the key milestones in the development of culmerciclib, a novel oral small molecule inhibitor of CDK2/4/6.
  • To highlight the regulatory approval of culmerciclib in China for a specific breast cancer patient population.

Main Methods:

  • Review of preclinical and clinical development data for culmerciclib.
  • Analysis of regulatory submission and approval process in China.

Main Results:

  • Culmerciclib, an oral small molecule inhibitor targeting CDK2, CDK4, and CDK6, has been developed by Chia Tai Tianqing Pharmaceutical.
  • The drug received its first marketing approval in China on December 9, 2025.
  • Approval is for the treatment of adults with HR+/HER2- advanced or metastatic breast cancer who have progressed after endocrine therapy, in combination with fulvestrant.

Conclusions:

  • Culmerciclib represents a significant advancement in the treatment of endocrine-resistant HR+/HER2- advanced or metastatic breast cancer.
  • The simultaneous inhibition of CDK2/4/6 by culmerciclib offers a potential strategy to overcome resistance mechanisms.
  • This first approval marks a major milestone for culmerciclib and provides a new therapeutic option for patients in China.