Cytogenetic Insights Cytogenetic Insights in Mesenchymal Tumors in Mesenchymal Tumors Jonathan A. Fletcher, M.D. Jonathan A. Fletcher, M.D. Pathology & Pediatrics Pathology & Pediatrics Brigham & Women’s Hospital Brigham & Women’s Hospital Dana-Farber Cancer Institute Dana-Farber Cancer Institute Harvard Medical School Harvard Medical School Boston, MA Boston, MA
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Cytogenetic Insights in Mesenchymal Tumors Jonathan A. Fletcher, M.D. Pathology & Pediatrics Brigham & Women’s Hospital Dana-Farber Cancer Institute Harvard.
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Cytogenetic Insights in Cytogenetic Insights in Mesenchymal TumorsMesenchymal Tumors
Jonathan A. Fletcher, M.D.Jonathan A. Fletcher, M.D.Pathology & PediatricsPathology & Pediatrics
Brigham & Women’s HospitalBrigham & Women’s HospitalDana-Farber Cancer InstituteDana-Farber Cancer Institute
Harvard Medical SchoolHarvard Medical SchoolBoston, MABoston, MA
How it is done!
Mince, then disaggregate cells by overnight treatment with collagenase
Disaggregated cells are plated as monolayer
cultures on glass slides or in
plastic flasks
All cultures are inspected daily, to determine whether tumor cells are growing, and when metaphase harvests should be performed
Leiomyoma: simple karyotype with t(12;14)
HMGA2(HMGIC)
Leiomyosarcoma: G-banded karyotype
Complex!
Clonal (arrows) and
nonclonal aberrations
Example 1
Novel biologic mechanisms revealed through indentification of recurrent
cytogenetic abnormalities in mesenchymal tumors
Aneurysmal Bone Cystand the fusion fusion oncogene
Aneurysmal Bone Cystand the fusion fusion oncogene
Aneurysmal Bone Cyst
• Patients are generally < 20 years old• Can recur locally, but do not become
malignant• “Primary ABC” have been generally
regarded as nonneoplastic • “Secondary ABC” associated with