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Published in: Breast Cancer Research and Treatment 2/2018

01-09-2018 | Clinical trial

Long-term breast cancer survival in relation to the metastatic tumor burden in axillary lymph nodes

Authors: Yvette Andersson, L. Bergkvist, J. Frisell, J. de Boniface

Published in: Breast Cancer Research and Treatment | Issue 2/2018

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Abstract

Purpose

The clinical significance of lymph node micrometastases and isolated tumor cells (ITCs) in breast cancer is still controversial. After a median follow-up of 52 months, a report from the Swedish Multicenter Cohort Study presented a worse cancer-specific and event-free survival for patients with micrometastases than node-negative individuals, but could not demonstrate a significant difference in overall survival (OS). Due to the tendency of breast cancer to relapse after more than 5–10 years, we now report the long-term survival of the cohort.

Methods

Between September 2000 and January 2004, 3355 breast cancer patients were included in a prospective cohort. Sentinel lymph node biopsy was always performed. Patients were classified in four groups according to their overall nodal stage: node negative (N0, 2372), ITCs (113), micrometastases (123), and macrometastases (747). Kaplan–Meier survival estimates and Cox proportional hazard regression models were applied.

Results

Median follow-up was 156 months. Ten-year cancer-specific survival and OS were significantly lower in case of micrometastases than in N0 (84.7 vs. 93.5%, p = 0.001, and 75.5 vs. 84.2%, p = 0.046, respectively). In case of macrometastases, corresponding survival rates were 82.8 and 74.3%. Only for those aged less than 50 years, cancer-specific survival and OS were significantly worse in case of ITCs than N0. Patients with micrometastases received less often chemotherapy than those with macrometastases (24.4 vs. 53.9%).

Conclusions

Lymph node micrometastases in breast cancer have a prognostic significance. This study demonstrates a similar survival for patients with micrometastases and those with macrometastases, possibly due to systemic undertreatment.
Appendix
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Metadata
Title
Long-term breast cancer survival in relation to the metastatic tumor burden in axillary lymph nodes
Authors
Yvette Andersson
L. Bergkvist
J. Frisell
J. de Boniface
Publication date
01-09-2018
Publisher
Springer US
Published in
Breast Cancer Research and Treatment / Issue 2/2018
Print ISSN: 0167-6806
Electronic ISSN: 1573-7217
DOI
https://doi.org/10.1007/s10549-018-4820-0

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