E-ISSN 2587-0831
Original Article
Sentinel Node Biopsy in Special Histologic Types of Invasive Breast Cancer
1 Germans Trias Pujol Hospital, Nuclear Medicine, Badalona, Spain  
2 Sant Jaume Calella H, Surgery, Calella, Spain  
3 Germans Trias Pujol H, Pathology, Badalona, Spain  
4 Mataró H, Surgey, Mataró, Spain  
5 Germans Trias Pujol H, Surgey, Badalona, Spain  
Eur J Breast Health 2016; 12: 78-82
DOI: 10.5152/tjbh.2016.2929
Key Words: Sentinel lymph node biopsy, breast cancer, invasiveness
Abstract

Objective: To assess the feasibility of sentinel node biopsy (SNB) in ductal and lobular invasive breast cancer, a group of tumors known as special histologic type (SHT) of breast cancer.

 

Materials and Methods: Between January 1997 and July 2008, 2253 patients from 6 affiliated hospitals underwent SNB who had early breast cancer and clinically negative axilla. The patients’ data were collected in a multicenter database. For lymphatic mapping, all patients received an intralesional dose of radiocolloid Tc-99m (4mCi in 0.4 mL saline), at least two hours before the surgical procedure. SNB was performed by physicians from the same nuclear medicine department in all cases.

 

Results: Of the 2253 patients in the database, the SN identification rate was 94.5% (no radiotracer migration in 123 patients), and positive sentinel node prevalence was 22%. SHT was reported in 144 patients (6.4%) of the whole series. In this subgroup, migration of radiotracer was unsuccessful in 8 patients (identification rate was 94.4%) and SNs were positive in 7.4%. SN positivity prevalence in these tumors was variable across the subtypes. Higher probability of lymphatic spread seemed to be related to tumor invasiveness (20% of positivity in micropapillary, 15% in cribriform subtypes, and 0% in adenoid-cystic). 

 

Conclusion: Sentinel node biopsy is feasible in special histologic subtypes of breast carcinoma with a good identification rate. Lower migration rates, however, might be associated with special histologic features (colloid subtype). Complete axillary dissection after a positive sentinel node cannot be omitted in patients with SHT breast cancer because they can be associated with further axillary disease; the reported very low incidence of axillary metastases would justify avoiding axillary dissection only in the adenoid-cystic subtype. 

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