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Microbiology · Virology: EBV and Burkitt lymphoma
Sample itemA 7-year-old boy from sub-Saharan Africa has a rapidly enlarging jaw mass. Biopsy shows sheets of medium-sized B cells with many macrophages giving a starry-sky pattern, and Epstein-Barr virus is demonstrated in the tumour cells. Which genetic change is characteristic?
Original practice item, not a recalled exam question. Nothing here is recorded.
The answer and the reasoning
A. t(8;14) placing MYC near the IgH locus
Endemic Burkitt lymphoma is associated with Epstein-Barr virus and holoendemic malaria. All forms carry a translocation, most often t(8;14), that places MYC under the control of immunoglobulin heavy-chain regulatory elements and drives proliferation.
Option by option
A. t(8;14) placing MYC near the IgH locus (correct)
Correct. t(8;14) deregulates MYC, the defining lesion of Burkitt lymphoma.
B. t(14;18) causing BCL2 overexpression
t(14;18) with BCL2 overexpression is characteristic of follicular lymphoma.
C. t(9;22) forming a BCR-ABL fusion
t(9;22) producing BCR-ABL is seen in chronic myeloid leukaemia.
D. t(11;14) causing cyclin D1 overexpression
t(11;14) with cyclin D1 overexpression is seen in mantle cell lymphoma.
Source note: Original NextPrep sample item — pending expert review. This item is original practice material awaiting independent expert review, so confirm important facts in a standard textbook.
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