Broadfield ZJ

Hain RD

Harrison CJ

Jalali GR

Martineau M

McKinley M

Michalova K

Robinson HM

Zemanova Z

Prenatal acquisition of leukaemia-associated gene rearrangements is a well-established phenomenon. This is the first report of a complex cytogenetic clone, in association with an ETV6/AML1 fusion, developing in utero. Identical twin girls, aged 4 years, developed ETV6/AML1-positive acute lymphoblastic leukaemia (ALL) within 3 months of one another. Both demonstrated an identical four way, variant t(12;21). There was gain of an AML1 signal in twin 1 and loss of an ETV6 one in twin 2 at interphase. This unique case study demonstrates that ETV6/AML1 fusion and the associated complex chromosomal rearrangements occurred in utero. Clonal expansion of the abnormal cell in one twin was followed by metastasis to the other. There was a prolonged preleukaemic phase, which lasted well into childhood. The short time between the two diagnoses of ALL suggests a common precipitating event. The significance of the different secondary markers remains unclear

Newcastle University E-Prints

Complex chromosomal abnormalities<em> in utero</em>, 5 years before leukaemia

Complex chromosomal abnormalities<em> in utero</em>, 5 years before leukaemia

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