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Micrometastatic Disease and Isolated Tumor Cells as a Predictor for Additional Breast Cancer Axillary Metastatic Burden

  • American Society of Breast Surgeons
  • Published:
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Abstract

Background

Our study aims were to investigate breast cancer patients with micrometastases or isolated tumor cells (ITCs) in sentinel lymph nodes (SLNs) to determine the rate of non-SLN metastasis and axillary recurrences, and to compare actual non-SLN metastasis rates with those predicted by the Memorial Sloan-Kettering Cancer Center (MSKCC) nomogram.

Methods

We identified 116 stage I to III breast cancer patients who underwent sentinel lymph node biopsy and had micrometastases or ITCs (<2-mm deposits). Patients underwent completion axillary lymph node dissection (ALND) (group 1) or had no further axillary surgery (group 2). P < 0.05 was considered statistically significant.

Results

Of 116 patients with micrometastases or ITCs in SLNs, 55 (47%) underwent completion ALND (group 1), and 61 (53%) had no further axillary surgery (group 2). The rate of non-SLN metastases in group 1 patients was 9 (16%) of 55, which was significantly less than that predicted by the MSKCC nomogram (median 30%, P < 0.001). Patient age, race, tumor histology, tumor grade, estrogen receptor/Her-2neu status, and lymphovascular invasion did not differ significantly between group 1 patients with positive non-SLNs and those with negative non-SLNs (P > 0.05 for each), but patients with positive non-SLNs had larger tumors (P < 0.001). No patient in group 1 experienced an axillary recurrence, while only one patient (1.6%) in group 2 experienced axillary recurrence.

Conclusions

The actual rate of positive non-SLNs for breast cancer patients with SLN micrometastases or ITCs who underwent completion ALND was significantly less than that predicted by the MSKCC nomogram. The rate of axillary recurrence is negligible, regardless of the extent of axillary staging.

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Acknowledgment

We thank the Alvin J. Siteman Cancer Center at Barnes-Jewish Hospital and Washington University School of Medicine in St. Louis, Missouri, for the use of the Biostatistics Core. The Core is supported in part by the National Cancer Institute Cancer Center Support Grant P30 CA91842 to the Siteman Cancer Center. We also thank Marsha Woodall for her maintenance of the surgical breast cancer database.

Conflict of interest

The authors declare no conflict of interest.

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Correspondence to Julie A. Margenthaler MD, FACS.

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Cyr, A., Gillanders, W.E., Aft, R.L. et al. Micrometastatic Disease and Isolated Tumor Cells as a Predictor for Additional Breast Cancer Axillary Metastatic Burden. Ann Surg Oncol 17 (Suppl 3), 303–311 (2010). https://doi.org/10.1245/s10434-010-1255-1

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  • DOI: https://doi.org/10.1245/s10434-010-1255-1

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