Infant acute lymphoblastic leukaemia with t(11; 19)

Area of Science:

• Hematology
• Pediatric Oncology
• Molecular Genetics

Background:

• Infant acute lymphoblastic leukaemia (ALL) is a rare but aggressive form of childhood cancer.
• Specific chromosomal translocations are associated with distinct clinical features and prognoses in ALL.
• The t(11;19) translocation is a less common but significant genetic abnormality in infant ALL.

Purpose of the Study:

• To describe the clinical and hematological characteristics of infant ALL cases with the t(11;19) translocation.
• To compare the features of t(11;19) infant ALL with other known genetic subtypes, particularly t(4;11).
• To assess the prognostic implications of the t(11;19) translocation in infant ALL.

Main Methods:

• Case series analysis of seven infants diagnosed with acute lymphoblastic leukaemia.
• Detailed clinical data collection including white blood cell counts, organomegaly, and central nervous system involvement.
• Cytogenetic analysis to identify the t(11;19) (q23; p13) chromosomal translocation.
• Immunophenotypic analysis of leukaemic blasts to determine lineage and maturity.

Main Results:

• Seven cases of infant ALL with t(11;19) were identified.
• Common features included high white cell counts, hepatosplenomegaly, and early central nervous system disease.
• Leukaemic blasts typically showed immature early B-cell features, with some cases exhibiting monocytoid characteristics.
• The clinical presentation and outcome were highly similar to cases with the t(4;11) translocation.

Conclusions:

• The t(11;19) translocation in infant ALL is associated with a distinct phenotype characterized by high white cell count, organomegaly, and early CNS involvement.
• Infant ALL with t(11;19) shares significant similarities with t(4;11) ALL, suggesting a comparable aggressive behavior.
• The presence of t(11;19) is a marker for a poor prognosis in infant acute lymphoblastic leukaemia, necessitating tailored treatment strategies.