Reliability of Detecting Macrometastases in Sentinel Lymph Node in Breast Cancer Patients by Bivalued Section in Comparison to Serial Section
Abstract
Objectives: The aim of this study was to compare the reliability of bivalved section with serial section to detect the macrometastases in sentinel lymph node in breast cancer patients.
Materials and Methods: A total number of 40 patients were involved in the reliability study to detect the macrometastases in sentinel lymph node (SLN) in breast cancer patients in the Department of Surgery, Phramongkutklao Hospital & College of Medicine, between January 2000 and June 2004.
Results: Of 76 sentinel lymph nodes, 28 were positive and 48 were negative. In detecting SLN by dye direct injection with isosulfan blue, 42 out of 45 cases were identified, with an identification rate of 93.3% and with false negative (skip metastases) in 2 cases (4.76%). The negative SLN by bivalved section was then studied by serial section at 1 mm interval and dyed with H & E, whereby I node of micrometastases was encountered. However, when compared with previous slide, the micrometastases already existed. No additional metastases were encountered in other lymph nodes as well as in false negative lymph nodes.
Conclusions: This study revealed that there was no difference in detecting macrometastases of SLN by bivalved section and serial section. The reliability in detecting the macrometastases by bivalved section in this study is 100%. However, the numbers of the sample are too small for conclusion and further studies with more sample size are required.
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