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MYC Amplification in the Form of Ring Chromosomes 8 in Acute Myeloid Leukemia with t(11;16)(q13;p11.2).
Oncogene amplification is uncommon in acute myeloid leukemia (AML). Cytogenetically, it is primarily found as double minute chromosomes (dmin) or homogeneously staining regions (hsr). A 62-year-old woman was admitted to our hospital because of anemia and thrombocytopenia. Her bone marrow was hypercellular with 78.6% myeloperoxidase- positive blasts. Some had micronuclei. The patient was diagnosed with AML M2 and remains in complete remission (CR) after induction therapy. G-banding at diagnosis showed 51,XX,t(11;16)(q13;p11.2),+r1,+mar1×4. Spectral karyotyping confirmed t(11;16) and revealed that the ring and the marker chromosomes were derived from multiple copies of ring chromosome 8. Fluorescence in situ hybridization (FISH) with a MYC probe at 8q24 detected amplified MYC signals on 1 large and 4 small ring chromosomes 8. One MYC signal was deleted from one of the 2 chromosomes 8. FISH with a FUS probe at 16p11.2 showed monoallelic deletion of FUS. Immunohistochemistry demonstrated MYC protein overexpression at diagnosis and almost negative expression in CR. These results indicate that MYC amplification could occur in ring chromosomes without dmin. A cryptic MYC deletion suggests that an episome model could be applicable to MYC amplification in ring chromosomes as observed for dmin and hsr. Furthermore, considering 2 further reported cases, t(11;16)(q13;p11) may be a very rare but recurrent translocation in AML.
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