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June 15, 2026Breast CancerOpen Access

Annual report of national clinical database-breast cancer registry in 2023: systemic therapy for small breast cancer

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Authors

SSShinsuke SasadaHKHiraku KumamaruNKNaoko Kinukawa

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Overview

Annual report provides insights on systemic therapy patterns for small breast cancer in Japan, indicating treatment variations by size and subtype.

Key Points

  • This report aims to present nationwide breast cancer statistics and systemic therapy approaches in Japan for 2023.
  • Analysis of data from the National Clinical Database-Breast Cancer Registry (NCD-BCR) including 107,372 registered patients across 1317 institutions.
  • Assessment of treatment modalities including surgery types, radiotherapy, and systemic therapies for different breast cancer subtypes.
  • Among patients with pT1abN0M0 breast cancer, 92.4% of HR-positive/HER2-negative patients received endocrine therapy.
  • 46.9% of HER2-positive patients received chemotherapy and/or anti-HER2 therapy.
  • Distribution of radiotherapy showed 75.2% received whole-breast irradiation.

Cite This Study

Sasada et al. (2026) studied this question.

synapsesocial.com/papers/6a2f96b4a1cfeec490827ff2https://doi.org/10.1007/s12282-026-01881-0
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Also Consider

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  1. 1Real-world data of HER2-negative early breast cancer patients treated with anthracycline and/or taxane regimens in Japan2024 · 1 citations
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  4. 4Abstract PS5-05-22: A Multicenter Retrospective Cohrt Study on Long-Term Outcomes after Partial Mastectomy in Japan2026
  5. 5Abstract PS3-07-06: Real-world Prognostic Evaluation of Adjuvant Endocrine Therapy, Ovarian Function Suppression, and Chemotherapy in Premenopausal HR-positive/HER2-negative Early Breast Cancer in Japan: The PEACE Study2026