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Published on: October 21, 2010
Rapid intraoperative immunohistochemical evaluation of sentinel lymph nodes for metastatic breast carcinoma
Elizabeth I Johnston1, Robyn A Beach, Sandra M Waldrop
1Department of Pathology and Laboratory Medicine, Emory University School of Medicine, Atlanta, Georgia 30322, USA. eijohn2@emory.edu
Insights
A new rapid immunohistochemistry (RIHC-CK) method accurately detects breast cancer metastases in sentinel lymph nodes (SLNs). This 8-minute test offers high sensitivity for identifying micrometastases, improving intraoperative evaluation during breast cancer surgery.
Area of Science:
- Oncology
- Surgical Pathology
- Immunohistochemistry
Background:
- Sentinel lymph node (SLN) biopsy is crucial for breast cancer staging.
- Intraoperative evaluation of SLNs aids surgical decision-making.
- Rapid immunohistochemistry (RIHC) offers potential for faster metastasis detection.
Purpose of the Study:
- To assess the accuracy and turnaround time of a novel rapid immunohistochemistry for pancytokeratin (RIHC-CK) method.
- To compare RIHC-CK performance against established intraoperative SLN assessment techniques.
Main Methods:
- Sixty-six SLNs from 32 breast cancer patients were analyzed.
- A new RIHC-CK kit was used on intraoperative frozen sections.
- Results were compared with touch preparations, frozen sections, and permanent sections (H&E, CK).
Main Results:
- RIHC-CK demonstrated 92% sensitivity and 94% accuracy for detecting breast cancer metastases in SLNs.
- The technique provided results within 8 minutes, showing high sensitivity compared to other intraoperative methods.
- RIHC-CK was found to be sensitive, accurate, and easy to perform and interpret.
Conclusions:
- RIHC-CK is a sensitive and accurate intraoperative method for detecting breast cancer metastases in SLNs.
- The speed and ease of RIHC-CK facilitate the identification of micrometastases potentially missed by current methods.
- Further research is needed to determine the prognostic significance and impact of RIHC-CK findings on surgical management.
Objective:
Sentinel lymph node (SLN) biopsy is an integral part of the surgical management of patients with breast cancer. Rapid immunohistochemistry (RIHC) has the potential to increase detection of metastatic carcinoma at the time of frozen section consultation. The authors assessed the accuracy and turnaround time of a newly developed RIHC method for pancytokeratin (RIHC-CK).
Methods:
Sixty-six SLNs from 32 patients with breast carcinoma were examined for metastasis using the Zymed Sentinel Lymph Node Rapid IHC Kit. Intraoperative frozen sections (6 mum) of the SLNs were incubated with Zymed anti-pan-cytokeratin/HRP conjugate, diaminobenzidine (DAB), and stained with hematoxylin. Slides were ready within 8 minutes and were interpreted as positive or negative for metastatic carcinoma. Results were compared with previous intraoperative touch preparations, frozen sections, hematoxylin and eosin (Perm H&E), and AEl/3-immunostained permanent sections (Perm CK).
Results:
Fourteen lymph nodes (19%) in 13 patients tested positive for metastatic carcinoma in Perm H&E, the gold standard. RIHC-CK had the highest sensitivity (92%) of the intraoperative tests, compared with touch preparations (64%) and frozen sections (80%). RIHC-CK showed 94% accuracy, compared with 96% (frozen section) and 93% (touch preparation). The RIHC technique took 8 minutes and was easy to perform and interpret.
Conclusions:
Zymed RIHC is a sensitive method for detecting breast cancer metastases in SLNs. The speed, accuracy, and ease of interpretation of the test allow for recognition of micrometastases (<2 mm) that might otherwise be undetectable by current methods of intraoperative evaluation. The prognostic significance and effect on surgical management of micrometastases in SLNs have yet to be determined.
