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GTF2I mutation in micronodular thymoma with lymphoid stroma
Andrea Bille1, Katherine Fryer2, Andrew Wallace2
1Department of Thoracic Surgery, Guy's and St Thomas' Hospitals NHS Foundation Trust, London, UK.
Journal of Clinical Pathology
|January 5, 2023
Summary
The rare micronodular thymoma with lymphoid stroma frequently harbors the GTF2I mutation, suggesting a biological link with thymoma types A and AB. This finding aids in distinguishing thymoma subtypes.
Area of Science:
- Oncology
- Molecular Pathology
- Genetics
Background:
- Micronodular thymoma with lymphoid stroma is a rare thymoma subtype.
- It shares indolent behavior and spindle morphology with thymoma types A and AB, which are associated with GTF2I mutations.
- The molecular genetics of micronodular thymoma remain largely uncharacterized.
Purpose of the Study:
- To investigate the GTF2I mutation status in 16 cases of micronodular thymoma.
- To explore the molecular genetic landscape of this rare thymoma subtype.
Main Methods:
- Retrieved 16 cases of micronodular thymoma.
- Conducted Sanger sequencing to test for GTF2I mutations.
- Documented clinicopathological findings.
Main Results:
- The GTF2I c.1271T>A p.(Leu424His) mutation was identified in 14 out of 16 tumors (87.5%).
- Follow-up data showed no evidence of recurrence in surviving patients, with a median follow-up of 100 months.
Conclusions:
- The high prevalence of GTF2I mutations in micronodular thymoma suggests a shared biological basis with thymoma types A and AB.
- This finding supports classifying micronodular thymoma, along with types A and AB, as a distinct biological group from type B thymomas.
- Spindle cell morphology and GTF2I mutation status may serve as key indicators for this classification.
