The Role of Sentinel Lymph Node Biopsy and Factors Associated with Invasion in Extensive DCIS of the Breast Treated by Mastectomy: The Cinnamome Prospective Multicenter Study

Ann Surg Oncol. 2015 Nov;22(12):3853-60. doi: 10.1245/s10434-015-4476-5. Epub 2015 Mar 17.


Background: When invasive components are discovered at mastectomy for vacuum-assisted biopsy (VAB)-diagnosed ductal carcinoma in situ (DCIS), the only option available is axillary lymph node dissection (ALND). The primary aim of this prospective multicenter trial was to determine the benefit of performing upfront sentinel lymph node (SLN) biopsy for these patients. The secondary aim was to determine DCIS factors associated with microinvasion or invasion.

Methods: The SLN procedure was performed during mastectomy, and for positive SLN an ALND was performed during the same intervention. A tissue microarray containing DCIS lesions from the mastectomy specimens was subsequently performed.

Results: From May 2008 to December 2010, 228 patients were enrolled from 14 French cancer centers, including 192 eligible patients with pure DCIS on VAB and successful SLN procedures. ALND was avoided for 51 [67 %; 95 % confidence interval (CI), 56-77 %] of all the patients who had microinvasive DCIS or DCIS associated with invasive carcinoma at mastectomy and a negative SLN. Of the 192 patients, 76 (39 %) with VAB-diagnosed DCIS were upgraded after mastectomy to micro (n = 20) or invasive disease (n = 56). The rate of positive SLN for patients with DCIS on VAB was 14 %. High nuclear grade of DCIS was associated with greater risk of microinvasion and invasion, and HER2-amplified DCIS was associated with greater risk of invasion.

Conclusions: Underestimation of invasive components is high when DCIS is diagnosed by VAB in patients undergoing mastectomy. Upfront SLN for patients with VAB-diagnosed extensive DCIS avoids unnecessary ALND for two-thirds of patients with micro or invasive disease on mastectomy.

Publication types

  • Clinical Trial
  • Multicenter Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Aged
  • Aged, 80 and over
  • Axilla
  • Breast Neoplasms / pathology*
  • Breast Neoplasms / surgery
  • Carcinoma, Intraductal, Noninfiltrating / pathology*
  • Carcinoma, Intraductal, Noninfiltrating / surgery
  • Female
  • Humans
  • Lymph Node Excision*
  • Lymph Nodes / pathology*
  • Lymph Nodes / surgery
  • Mastectomy
  • Middle Aged
  • Neoplasm Invasiveness
  • Prospective Studies
  • Receptor, ErbB-2 / analysis
  • Sentinel Lymph Node Biopsy*
  • Tissue Array Analysis
  • Unnecessary Procedures
  • Young Adult


  • ERBB2 protein, human
  • Receptor, ErbB-2