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ORIGINAL ARTICLE |
Department of Pathology, Bács-Kiskun County Teaching Hospital, Nyiri ut 38, POB 149, Kecskemét, H-6000 Hungary
Correspondence to:
Dr G Cserni, Department of Pathology, Bács-Kiskun County Teaching Hospital, Nyiri ut 38, POB 149, Kecskemét, H-6000 Hungary;
cserni{at}freemail.hu
Aims: To evaluate two detailed step sectioning protocols for sentinel lymph nodes (SLNs).
Methods: After vital dye or combined dye and radiocolloid guided biopsy, SLNs were fixed in formalin and embedded in paraffin wax. In protocol A, SLNs from 123 patients were sectioned in steps of 50–100 µm, whereas in protocol B, SLNs from 123 patients were sectioned at steps of 250 µm. Epithelial marker immunohistochemistry (IHC) was performed on multiple levels in cases with negative haematoxylin and eosin findings.
Results: In groups A and B, 74 and 47 patients were found to have tumour cells in their axillary SLNs, and 19 (28%) and 18 (19%) patients, respectively, were upstaged as compared with the standard histological assessment. Nodal involvement detected by deeper sections was often micrometastatic or in isolated tumour cells
Conclusions: Serial sectioning and IHC are recommended for the evaluation of SLNs. The optimal extent of the histopathological work up should be studied further.
Keywords: breast cancer; immunohistochemistry; micrometastasis; sentinel lymph nodes; step sectioning
Abbreviations: HE, haematoxylin and eosin; IHC, immunohistochemistry; SLN, sentinel lymph node; SLNB, sentinel lymph node biopsy; VP, virtual protocol
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