Abstract
Objective
This study aimed to establish intraoperative diagnostic criteria of sentinel lymph node (SLN) micro-/macrometastasis on the basis of tissue rinse liquid-based cytology (TRLBC) in gynecological cancer.
Methods
We enrolled 214 patients with gynecological cancer who underwent rapid diagnosis of SLN metastasis on the basis of TRLBC from a total of 490 SLNs. For slides that were classified as positive for atypical cells on cytological inspection, we counted the number of clusters (an atypical cell mass consisted of three or more cells) and the number of single cells (an atypical cell other than clusters). Receiver operating characteristic (ROC) analysis was applied to determine the efficiency of predicting SLN micro-/macrometastasis.
Results
On cytological inspection, 36 slides were classified as positive for atypical cells, while 21 slides (4.3%) were true positive, 15 (3.1%) were false positive, and 454 (92.6%) were true negative. There were no false negative results in this study. The area under the ROC curve for the number of cluster was superior to that for the number of single cells for distinguishing micro-/macrometastasis from negative/isolated tumor cells (0.86 vs. 0.67, P = 0.032). The optimum cut-off value of the number of clusters was 5 for distinguishing these two categories.
Conclusions
TRLBC is a highly sensitive alternative for detecting SLN metastasis as a rapid intraoperative diagnosis. Counting the number of atypical cell clusters might be useful for distinguishing micro-/macrometastasis from isolated tumor cells.
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Acknowledgements
We thank Ellen Knapp, PhD, from Edanz Group (https://en-author-services.edanzgroup.com/ac) for editing a draft of this manuscript.
Funding
This study was supported by Grants-in-Aid for Scientific Research (C) from the Ministry of Education, Culture, Sports, Science and Technology of Japan.
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This study was designed, directed and coordinated by YT and KY, as the principal investigator, provided conceptual and technical guidance for all aspects of the project. HM mainly drafted the manuscript. HY performed the statistical analysis. CS, SM, RY, KM, TT, HK, and ST contributed to performing sentinel lymph node mapping surgery and collecting data information. HS, KT contributed to preparing TRLBC/paraffin block specimens and performing microscopic examination of cytological/histological specimens. KY and YT contributed equally to participating in the study design and coordination. The manuscript was written by HM and YT and commented on by all authors.
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Matsumiya, H., Todo, Y., Yamazaki, H. et al. Diagnostic criteria of sentinel lymph node micrometastasis or macrometastasis based on tissue rinse liquid-based cytology in gynecological cancer. Int J Clin Oncol 25, 2138–2143 (2020). https://doi.org/10.1007/s10147-020-01774-y
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DOI: https://doi.org/10.1007/s10147-020-01774-y