Abstract
Objectives
To (a) determine the diagnostic validity of axillary ultrasound (AUS) in pT1 tumours and whether fine-needle aspiration (FNA) improves its diagnostic performance, and (b) determine the negative predictive value (NPV) of AUS in a simulation environment (cutoff: two lymph nodes with macrometastases) in patients fulfilling American College of Surgeons Oncology Group (ACOSOG) Z0011 criteria.
Materials and methods
This retrospective multicentre cross-sectional study analysed diagnostic accuracy in 355 pT1 breast cancers. All patients underwent AUS; visible nodes underwent FNA regardless of their AUS appearance. Sentinel node biopsy and axillary lymph node dissection (ALND) were gold standards. Data were analysed considering micrometastases ‘positive’ and considering micrometastases ‘N negative’. The simulation environment included all patients fulfilling ACOSOG Z0011 criteria.
Results
Axillary involvement: 22.8 %; AUS sensitivity: 46.9 % (Nmic positive)/66.7 % (Nmic negative); AUS+FNA sensitivity: 52.6 % (pNmic positive)/72.0 % (pNmic negative). In the simulation environment, AUS had 75.0 % sensitivity, 88.9 % specificity and 99.2 % NPV.
Conclusion
AUS has moderate sensitivity in T1 tumours. As ALND is unnecessary in micrometastases, considering micrometastases ‘N negative’ increases the practical impact of AUS.
In patients fulfilling ACOSOG Z0011 criteria, AUS alone can predict cases unlikely to benefit from ALND.
Key Points
• AUS+FNA can predict axillary involvement, thus avoiding SNB.
• Not all patients with axillary involvement need ALND.
• Axillary tumour load determines axillary management.
• AUS could classify patients according to axillary load.
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Abbreviations
- ALND:
-
Axillary lymph node dissection
- AUS:
-
Axillary ultrasound
- BCS:
-
Breast-conserving surgery
- FNA:
-
Fine-needle aspiration
- PLN:
-
Palpable lymph node
- SNB:
-
Sentinel node biopsy
- WBRT:
-
Whole-breast radiotherapy
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Acknowledgments
Other members of the GMVOB include: L.Tortajada, MD; M. Villajos, MD; S. Ganau, MD; F. Escribano, MD; A. Martín, MD; E. Picas, MD; N. Martinez, MD; S. Santos, MD; I. Romero, MD; J. Planas, MD; J. de Torres, MD; A. Reñé, MD; P. Palañá, MD.
We thank Xavier Andreu, MD PhD, for his great help in writing up the pathology analysis and John Giba for help with English.
The scientific guarantor of this publication is Melcior Sentís, MD, Head of Department. Women’s Imaging. Department of Radiology. UDIAT Centre Diagnòstic. Institut Universitari Parc Taulí – UAB. The authors of this manuscript declare no relationships with any companies whose products or services may be related to the subject matter of the article. The authors state that this work has not received any funding. Marisa Baré, MD, PhD, epidemiologist at the Clinical Epidemiology Unit and Screening Office kindly provided statistical advice for this manuscript.
Each institution’s review board approved the study. Written informed consent was not required for this study because the data analyzed were collected as part of the routine protocols in force at each institution. Methodology: retrospective, diagnostic or prognostic study, multicentre study.
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Fig. 2
Clinical management for the entire series (GIF 143 kb)
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del Riego, J., Diaz-Ruiz, M.J., Teixidó, M. et al. The impact of preoperative axillary ultrasonography in T1 breast tumours. Eur Radiol 26, 1073–1081 (2016). https://doi.org/10.1007/s00330-015-3901-2
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DOI: https://doi.org/10.1007/s00330-015-3901-2