title: Intraoperative frozen section analysis of sentinel lymph node in breast cancer patients treated with neoadjuvant chemotherapy.
abstract: BACKGROUND
  Recently, many studies have demonstrated the feasibility and accuracy of sentinel lymph node (SLN) biopsy for patients treated with neoadjuvant chemotherapy (NAC). However, no studies have been conducted to evaluate the accuracy of frozen section (FS) analysis of SLN in NAC-treated patients. The aim was to evaluate the accuracy of intraoperative FS analysis of SLNs in breast cancer patients treated with NAC in comparison with that in those not treated.
  
  
  METHODS
  Patients with primary breast cancer either treated with NAC (n = 62) or not treated (n = 301) were included in this study. Intraoperatively, the largest cut surface (2-mm thickness) of the SLN was subjected to FS analysis. Remainders of the SLN were formalin-fixed, serially sectioned at 2-mm thickness, and subjected to H&E staining and immunohistochemistry. The largest diameter of metastases in the SLN was measured.
  
  
  RESULTS
  The sensitivity, specificity, and accuracy of FS analysis of SLNs were 74, 100, and 88%, respectively, for NAC-treated patients, similar to the corresponding values of 71, 99, and 90% for non-NAC-treated patients. The sensitivity of FS analysis for macrometastases was lower for NAC-treated patients (76%) than for non-NAC-treated patients (91%), while that for micrometastases and isolated tumor cells was higher for NAC-treated patients (67%) than for non-NAC-treated patients (31%). However, neither of these differences was statistically significant.
  
  
  CONCLUSIONS
  Intraoperative FS analysis of SLNs is as accurate for NAC-treated as for non-NAC-treated patients, indicating that FS analysis of SLNs is a clinically acceptable method for those receiving NAC.
authors.affiliation: Department of Breast and Endocrine Surgery, Osaka University, Graduate school of medicine, 2-2-E10 Yamada-oka, Suita, Osaka 565-0871, Japan.
authors.forename: Kenzo
authors.initials: K
authors.lastname: Shimazu
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Tamaki
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Taguchi
authors.forename: Fumine
authors.initials: F
authors.lastname: Tsukamoto
authors.forename: Tsutomu
authors.initials: T
authors.lastname: Kasugai
authors.forename: Shinzaburo
authors.initials: S
authors.lastname: Noguchi
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000970:Antineoplastic Agents / Q000008:administration & dosage*; D001365:Axilla; D001943:Breast Neoplasms / Q000188:drug therapy / Q000473:pathology* / Q000601:surgery; D005260:Female; D005629:Frozen Sections; D006801:Humans; D007432:Intraoperative Period; D008198:Lymph Nodes / Q000473:pathology*; D008207:Lymphatic Metastasis; D008875:Middle Aged; D020360:Neoadjuvant Therapy; D021701:Sentinel Lymph Node Biopsy / Q000379:methods*
chemical_list: D000970:Antineoplastic Agents