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Journal Article
Research Support, Non-U.S. Gov't
Unique clonal relationship between T-cell acute lymphoblastic leukemia and subsequent Langerhans cell histiocytosis with TCR rearrangement and NOTCH1 mutation.
Genes, Chromosomes & Cancer 2015 July
Acute lymphoblastic leukemia (ALL) occasionally develops before or after the onset of Langerhans cell histiocytosis (LCH). The mechanism of LCH developing after ALL remains unclear; thus the clonality of LCH developing during maintenance chemotherapy for T-cell ALL (T-ALL) was investigated. The T-ALL and LCH cells tested had the same T-cell receptor (TCR) gamma rearrangement. Mutation analysis of the NOTCH1 gene revealed 7213C>T (Q2405X) in exon 34 in T-ALL and LCH cells, but 5156T>C (I1719T) in exon 27 only in T-ALL. Polymerase chain reaction-restriction fragment length polymorphism analysis revealed three patterns of NOTCH1 mutations in T-ALL cells. The results suggest that the T-ALL and LCH cells were derived from a common precursor with TCR rearrangement and a single NOTCH1 mutation, rather than LCH cells developing from a minor clone of T-ALL with single NOTCH1 mutation.
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