Rask G, Nazemroaya A, Jansson M, Wadsten C, Nilsson G, Blomqvist C, Holmberg L, Wärnberg F, Sund M. Correlation of tumour subtype with long-term outcome in small breast carcinomas: a Swedish population-based retrospective cohort study.
Breast Cancer Res Treat 2022;
195:367-377. [PMID:
35933487 PMCID:
PMC9464733 DOI:
10.1007/s10549-022-06691-4]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2022] [Accepted: 06/18/2022] [Indexed: 11/28/2022]
Abstract
PURPOSE
To investigate if molecular subtype is associated with outcome in stage 1 breast cancer (BC).
METHODS
Tissue samples from 445 women with node-negative BC ≤ 15 mm, treated in 1986-2004, were classified into surrogate molecular subtypes [Luminal A-like, Luminal B-like (HER2-), HER2-positive, and triple negative breast cancer (TNBC)]. Information on treatment, recurrences, and survival were gathered from medical records.
RESULTS
Tumour subtype was not associated with overall survival (OS). Luminal B-like (HER2-) and TNBC were associated with higher incidence of distant metastasis at 20 years (Hazard ratio (HR) 2.26; 95% CI 1.08-4.75 and HR 3.24; 95% CI 1.17-9.00, respectively). Luminal B-like (HER2-) and TNBC patients also had worse breast cancer-specific survival (BCSS), although not statistically significant (HR 1.53; 95% CI 0.70-3.33 and HR 1.89; 95% CI 0.60-5.93, respectively). HER2-positive BC was not associated with poor outcome despite no patient receiving HER2-targeted therapy, with most of these tumours being ER+.
CONCLUSIONS
Stage 1 TNBC or Luminal B-like (HER2-) tumours behave more aggressively. Women with HER2+/ER+ tumours do not have an increased risk of distant metastasis or death, absent targeted treatment.
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