Molecular processes involved in B cell acute lymphoblastic leukaemia

Area of Science:

• Pediatric Oncology
• Hematology
• Molecular Biology

Background:

• B cell acute lymphoblastic leukemia (B-ALL) is a prevalent malignancy in children, with origins often traced to genetic alterations during fetal development.
• Key genetic insults, such as chromosomal translocations or changes in chromosome number (aneuploidy), are critical determinants of prognosis and therapeutic response.
• While adult B-ALL shares molecular similarities, this review concentrates on the pediatric population due to its higher incidence.

Purpose of the Study:

• To summarize current biological, clinical, and epidemiological knowledge of pediatric B-cell acute lymphoblastic leukemia.
• To provide an overview of four well-characterized subtypes: t(4;11) MLL-AF4, t(12;21) ETV6-RUNX1, t(1;19) E2A-PBX1, and t(9;22) BCR-ABL1.

Main Methods:

• Literature review focusing on pediatric B-cell acute lymphoblastic leukemia.
• Analysis of biological, clinical, and epidemiological data for specific subtypes.
• Synthesis of information on genetic alterations and their impact.

Main Results:

• The review details the genetic underpinnings of B-ALL, including specific chromosomal translocations.
• It highlights the prognostic significance of initial genetic insults in pediatric B-ALL.
• Information on four distinct subtypes (MLL-AF4, ETV6-RUNX1, E2A-PBX1, BCR-ABL1) is presented.

Conclusions:

• Early genetic events in utero are pivotal in the pathogenesis and outcome of pediatric B-ALL.
• Understanding these specific subtypes is crucial for targeted therapy and improved patient prognosis.
• This review consolidates essential knowledge for researchers and clinicians in pediatric oncology.