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Chinese Journal of Breast Disease(Electronic Edition) ›› 2026, Vol. 20 ›› Issue (02): 69-81. doi: 10.3877/cma.j.issn.1674-0807.2026.02.001

• Guidelines and Consensus •    

Expert consensus on off-label use of endocrine therapy for breast cancer

Breast Cancer Committee of Chinese Society of Clinical Oncology, Multidisciplinary Committee on Oncology of Chinese Medical Doctor Association, Guangdong Pharmaceutical Association   

  1. 1. Breast Tumor Center, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou 510120, China
    2. Department of Oncology, Fifth Medical Center of Chinese PLA General Hospital, Beijing 100039, China
  • Received:2025-10-10 Online:2026-04-01 Published:2026-04-16

Abstract:

Endocrine therapy is a crucial treatment modality for hormone receptor-positive breast cancer. However, off-label use of endocrine agents is widely observed in clinical practice. To provide evidence-based guidance, a panel of experts from the Breast Cancer Committee of the Chinese Society of Clinical Oncology (CSCO), the Oncology Multidisciplinary Committee of the Chinese Medical Doctor Association, and the Guangdong Pharmaceutical Association systematically reviewed and evaluated the evidence supporting off-label endocrine therapy for breast cancer. This process involved comprehensive literature searches, critical appraisal of existing guidelines, consensus statements, and practice standards, as well as a re-evaluation of randomized controlled trials (RCTs) involving approved endocrine agents. Using the CSCO evidence grading and recommendation system, the strength of evidence and recommendations were determined. Consequently, 23 recommendations addressing 21 clinical questions were developed. This consensus aims to provide clinicians with a basis for rational drug use and offers a reference for pharmacy departments in managing off-label endocrine therapies.

Key words: Breast neoplasms, Endocrine therapy, Off-label drug use, Evidence-based medicine, Expert consensus

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