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Is sentinel node biopsy necessary in conservatively treated DCIS?

Thomas B Julian1, Stephanie R Land, Virginie Fourchotte

  • 1National Surgical Adjuvant Breast and Bowel Project Operations Office and Biostatistical Center, Pittsburgh, Pennsylvania, USA. tjulian@wpahs.org

Annals of Surgical Oncology
|May 31, 2007
PubMed
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Axillary node involvement is rare in ductal carcinoma in situ (DCIS) patients treated conservatively. Routine sentinel node biopsy (SNB) is not supported for localized DCIS following local excision.

Area of Science:

  • Oncology
  • Surgical Oncology
  • Breast Cancer Research

Background:

  • Ductal carcinoma in situ (DCIS) management involves assessing axillary node involvement risk.
  • Sentinel node biopsy (SNB) is standard for invasive breast cancer staging, but its role in DCIS is debated.
  • Local excision (LE), observation, and breast irradiation are conservative treatments for DCIS.

Purpose of the Study:

  • To determine the risk of axillary node involvement in patients with DCIS.
  • To evaluate the necessity of axillary node assessment in DCIS patients.

Main Methods:

  • Analysis of patient records from NSABP trials B-17 and B-24 involving DCIS patients.
  • Patients received either no further therapy or breast irradiation after LE (B-17).
  • Patients received placebo or tamoxifen after LE + radiotherapy (B-24), with some undergoing axillary lymph node dissection (ALND).

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Main Results:

  • Ipsilateral nodal recurrence (INR) was observed in 7 patients in NSABP B-17, with an overall INR rate of 0.83/1000 patient-years.
  • In NSABP B-24, the overall INR rate was 0.36/1000 patient-years.
  • INR is a reliable indicator of axillary involvement at the time of DCIS diagnosis.

Conclusions:

  • Ipsilateral nodal recurrence is exceptionally rare in patients with DCIS treated conservatively.
  • Routine sentinel node biopsy is not recommended for conservatively treated, localized DCIS.