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Impact of the extent of axillary surgery in patients with N2–3 disease in the de-escalation era: a propensity score-matched study

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Abstract

Background

Reduction of surgeries in axillary has been proved feasible in breast cancer with negative and limited involved axillary lymph nodes. However, for women with a heavy axillary burden, the extent of dissection is still arguable.

Patients and methods

From a total of 7042 patients with breast cancer who underwent surgical treatments between 2008 and 2014, 692 (9.85%) patients with the axillary staging of N2–3M0 were classified into Level I–II dissection group and Level I–III dissection group. 203 pairs of patients were matched by the propensity score.

Results

The positive rate of level-III lymph nodes is 62.4% in patients who underwent Level I–III dissection. There are 67 (22.1%) patients who experienced rise in staging from N2 to N3 due to level-III dissection. With a median follow-up of 62.4 months, no significant difference was observed in RFS (P = 0.897), MFS (P = 0.610) and OS (P = 0.755) between level I–II group and level I–III group. The same results were observed in the independent analysis of neoadjuvant and non-neoadjuvant subgroups. The binary regression model showed the positivity of level-III is only associated with involved lymph nodes in level-II.

Conclusion

Additional level-III dissection has a limited impact on survival but still valuable in an accurate stage. The reduction of surgeries in axillary should be treated with discretion in breast cancer patients with a heavy axillary burden.

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Correspondence to N. Lyu or W. Wei.

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Conflict of interest

The authors declare that they have no conflict of interest.

Research involving human participants and/or animals

This retrospective study was approved by the Ethical Review Committee of Sun Yat-sen University Cancer Center and conducted following the principles of the Declaration of Helsinki. Nine hundred and forty-five consecutive female patients diagnosed with pathologic N2–3 (pN2–3) invasive breast cancer between October 2008 and December 2014 were identified from a total of 7042 patients with breast cancer in the Sun Yat-Sen University Cancer Center Database.

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Patients’ informed consent was obtained before conducting the treatment.

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12094_2020_2444_MOESM1_ESM.tif

Figure S1—Kaplan–Meier curves for locoregional recurrence-free survival (RFS), distant metastasis-free survival (MFS) and overall survival (OS) in L-II group and L-III group before match. A, C, and E: neoadjuvant population and, B, D and F: non-adjuvant population. Supplementary material 1 (TIFF 155 kb)

12094_2020_2444_MOESM2_ESM.tif

Figure S2—Kaplan–Meier locoregional RFS curves in the subgroups of level III lymph nodes resected population. Supplementary material 2 (TIFF 1737 kb)

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Figure S3—Kaplan–Meier distant MFS curves in the subgroups of level III lymph nodes resected population. Supplementary material 3 (TIFF 1892 kb)

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Figure S4—Kaplan–Meier OS curves in the subgroups of level III lymph nodes resected population. Supplementary material 4 (TIFF 1788 kb)

Supplementary material 5 (DOCX 27 kb)

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Supplementary material 8 (DOCX 23 kb)

Supplementary material 9 (DOCX 20 kb)

Supplementary material 10 (DOCX 19 kb)

Supplementary material 11 (DOCX 20 kb)

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Kong, Y., Yang, A., Xie, X. et al. Impact of the extent of axillary surgery in patients with N2–3 disease in the de-escalation era: a propensity score-matched study. Clin Transl Oncol 23, 526–535 (2021). https://doi.org/10.1007/s12094-020-02444-1

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  • DOI: https://doi.org/10.1007/s12094-020-02444-1

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