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Morphometric Analysis of Lateral Cervical Lymph Node Metastasis in Papillary Thyroid Carcinoma Using Digital Pathology

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Abstract

Digital pathology uses digitized images for cancer research. We aimed to assess morphometric parameters using digital pathology for predicting recurrence in patients with papillary thyroid carcinoma (PTC) and lateral cervical lymph node (LN) metastasis. We analyzed 316 PTC patients and assessed the longest diameter and largest area of metastatic focus in LNs using a whole slide imaging scanner. In digital pathology assessment, the longest diameters and largest areas of metastatic foci in LNs were positively correlated with traditional optically measured diameters (R = 0.928 and R2 = 0.727, p < 0.001 and p < 0.001, respectively). The optimal cutoff diameter was 8.0 mm in both traditional microscopic (p = 0.009) and digital pathology (p = 0.016) evaluations, with significant differences in progression-free survival (PFS) observed at this cutoff (p = 0.006 and p = 0.002, respectively). The predictive area’s cutoff was 35.6 mm2 (p = 0.005), which significantly affected PFS (p = 0.015). Using an 8.0-mm cutoff in traditional microscopic evaluation and a 35.6-mm2 cutoff in digital pathology showed comparable predictive results using the proportion of variation explained (PVE) methods (2.6% vs. 2.4%). Excluding cases with predominant cystic changes in LNs, the largest metastatic areas by digital pathology had the highest PVE at 3.9%. Furthermore, high volume of LN metastasis (p = 0.001), extranodal extension (p = 0.047), and high ratio of metastatic LNs (p = 0.006) were associated with poor prognosis. Both traditional microscopic and digital pathology evaluations effectively measured the longest diameter of metastatic foci in LNs. Moreover, digital pathology offers limited advantages in predicting PFS of patients with lateral cervical LN metastasis of PTC, especially those without predominant cystic changes in LNs.

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Data Availability

The datasets generated during and/or analyzed during the current study are available from the corresponding author upon reasonable request.

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Acknowledgements

A part of this study was presented as an abstract at a spring meeting of the Korean Thyroid Association in 2023.

Funding

Dong Eun Song acknowledges support from the National Research Foundation of Korea Research Grant (2021R1F1A1045552) and a grant (2022IL0016) from the Asan Institute for Life Sciences, Asan Medical Center, Seoul, South Korea. The remaining authors have no funding to report.

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Authors and Affiliations

Authors

Contributions

Chae A Kim: data collection (equal), formal analysis (lead), and writing—original draft and revision (lead). Hyeong Rok An: formal analysis (equal) and visualization of results (lead). Jungmin Yoo: data collection (equal) and data curation (equal). Yu-Mi Lee and Tae-Yon Sung: data collection (equal), interpretation of the results (equal), and writing—editing (equal). Won Gu Kim: conceptualization (supporting), interpretation of the results (lead), writing—review and editing (lead), and revision (supporting). Dong Eun Song: conceptualization (lead), pathology review (lead), writing—review and editing (lead), and revision (supporting). All the authors had full access to the data, took responsibility for the accuracy of the data analysis, and approved the final version of the manuscript.

Corresponding authors

Correspondence to Won Gu Kim or Dong Eun Song.

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Ethical Approval

This study was performed in line with the principles of the Declaration of Helsinki. The study protocol was reviewed and approved by the Institutional Review Board of the Asan Medical Center (IRB no: 2022-0791).

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Informed consent was obtained from all participants and/or their legal guardians.

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The authors declare no competing interests.

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Kim, C.A., An, H.R., Yoo, J. et al. Morphometric Analysis of Lateral Cervical Lymph Node Metastasis in Papillary Thyroid Carcinoma Using Digital Pathology. Endocr Pathol (2023). https://doi.org/10.1007/s12022-023-09790-0

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