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Metastatic Patterns: Insights from Japanese Pathological Autopsy Registry Analysis
Tomohiko Hara1,2, Suguru Oka2, Shinji Ito3
1Office of Research Administration, Center for Regulatory Science, Pharmaceuticals and Medical Devices Agency, Tokyo, Japan.
Oncology
|November 21, 2024
Summary
Metastatic patterns vary significantly across 76 primary malignancies. This study classified these patterns, identifying key metastatic sites like the brain and lung, crucial for understanding cancer spread.
Area of Science:
- Oncology
- Pathology
- Biostatistics
Background:
- Understanding cancer metastasis patterns is vital for effective malignancy treatment.
- Identifying characteristic organ metastases, including rare cancers, aids in treatment stratification.
Purpose of the Study:
- To identify characteristic organ metastases for 76 primary malignancies.
- To classify malignancies based on their distinct metastatic patterns.
Main Methods:
- Analysis of 332,195 autopsy cases (1993-2021) from Japan.
- Calculation of metastatic frequency and proportion for 48 organ sites across 76 primary malignancies.
- Classification of metastatic patterns using hierarchical and nonhierarchical clustering.
Main Results:
- Significant variation in metastatic propensity observed (e.g., placenta, eye, ovary vs. CNS malignancies).
- Characteristic metastasis sites identified (e.g., lung in parathyroid, bone in prostate).
- Seven distinct categories of primary malignancies emerged based on key metastatic sites (brain, lung, liver, bone, peritoneum, hematolymphoid).
Conclusions:
- Comprehensive overview of metastatic organ sites and frequencies for 76 primary malignancies.
- Findings offer valuable insights for future oncological research and clinical practice.
- Metastatic organ distribution is influenced by anatomical location and primary tumor specificity.
