Clinical subtypes and prognosis of pregnancy-associated breast cancer: results from the Korean Breast Cancer Society Registry database

Soo Youn Bae, Sei Joong Kim, Jung Sun Lee, Eun Sook Lee, Eun Kyu Kim, Ho Young Park, Young Jin Suh, Hong Kyu Kim, Ji Young You, Seung Pil Jung

    Research output: Contribution to journalArticlepeer-review

    7 Citations (Scopus)

    Abstract

    Purpose: We analyzed the clinicopathologic characteristics and prognosis of pregnancy-associated breast cancer (PABC) according to clinical subtypes to better understand the characteristics of PABC. Methods: A total of 83,792 female patients between the ages of 20 and 49 were enrolled in the Korean Breast Cancer Society Registry database from January 1, 1996 to December 31, 2015. ‘PABC’ is defined as breast cancer diagnosed during pregnancy or within 1 year after delivery. Other patients were defined as ‘non-PABC’ patients. Results: In non-PABC patients, luminal A subtype was the most common (50.2%). In PABC patients, TNBC was the most common (40.4%) subtype, while luminal A comprised 21.2% and HER2 subtype comprised 17.3%. There was a significant difference in overall survival (OS). In non-PABC patients, TNBC had the highest HR (HR 2.3, 95% CI 2.1–2.6). In PABC patients, the luminal B subtype (HR+ HER2-high Ki67) had the highest HR at 7.0 (95% CI 1.7–29.1). In multivariate analysis of OS by subtypes, PABC patients had significantly higher HR than non-PABC patients in the HER2 subtype (HR 2.0, 95% CI 1.1–3.7) and luminal B subtype (HR+ HER2-high Ki67) (HR 4.4, 95% CI 1.6–12.3). Conclusion: PABC showed different biologic features than non-PABC. PABC had a particularly poor prognosis in the luminal B (HR+ HER2-highKi67) and HER2 subtypes. To improve the prognosis of PABC, treatment should be considered according to subtype. Development of drugs that can be used during pregnancy is needed.

    Original languageEnglish
    Pages (from-to)113-121
    Number of pages9
    JournalBreast Cancer Research and Treatment
    Volume172
    Issue number1
    DOIs
    Publication statusPublished - 2018 Nov 1

    Keywords

    • Breast cancer
    • Pregnancy
    • Prognosis
    • Subtype

    ASJC Scopus subject areas

    • Oncology
    • Cancer Research

    Fingerprint

    Dive into the research topics of 'Clinical subtypes and prognosis of pregnancy-associated breast cancer: results from the Korean Breast Cancer Society Registry database'. Together they form a unique fingerprint.

    Cite this