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A primary thymic adenocarcinoma with two components that traced distinct evolutionary trajectories
Ayami Ishida1, Yosuke Yamada1, Yoshihiro Ishida2
1Department of Diagnostic Pathology, Kyoto University Hospital, Kyoto, Japan.
Pathology International
|September 28, 2021
Summary
This study details a rare case of thymic adenocarcinoma with distinct genetic profiles in its solid and cystic components. Findings reveal unique mutations, suggesting varied therapeutic targets for thymic epithelial tumors.
Area of Science:
- Oncology
- Genetics
- Tumor Biology
Background:
- Thymic adenocarcinoma is a rare subtype of thymic epithelial tumors.
- Understanding its genetic landscape is crucial for comprehensive tumor analysis.
Observation:
- A female patient presented with thymic adenocarcinoma featuring both solid (lesion-1) and cystic (lesion-2) components.
- Histological analysis revealed poorly differentiated adenocarcinoma in lesion-1 and enteric-type adenocarcinoma in lesion-2 nodules.
Findings:
- Whole-exome sequencing demonstrated distinct genetic profiles for lesion-1 and lesion-2, with shared CDKN2A mutations.
- Lesion-1 showed microsatellite instability-high and high mutation burden, potentially responsive to immune checkpoint inhibitors.
- Lesion-2 exhibited whole-genome doubling and a KRAS hotspot mutation.
Implications:
- This case highlights novel genetic features within a single thymic adenocarcinoma.
- Distinct mutational processes within a tumor underscore the need for personalized treatment strategies.
- Further research into heterogeneous thymic tumors is warranted for improved patient outcomes.
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