A t(1;22)(p13;q13) in four children with acute megakaryoblastic leukemia (M7), two with Down syndrome

Area of Science:

• Pediatric Oncology
• Hematology
• Cytogenetics

Background:

• Acute megakaryoblastic leukemia (AML-M7) is a subtype of acute myeloid leukemia.
• The chromosomal translocation t(1;22)(p13;q13) is a known genetic abnormality associated with AML-M7.
• This translocation is typically observed in infants under one year old.

Observation:

• The study identified four pediatric patients with AML-M7 and the t(1;22) translocation.
• Two of these patients had Down syndrome.
• Patient ages ranged from 7 months to 10 years, including older children.

Findings:

• The observed age range of presentation for AML-M7 with t(1;22) in this cohort extends beyond the previously reported exclusively infant demographic.
• The presence of Down syndrome in two cases, along with the t(1;22) translocation, adds to the heterogeneity of genetic findings in pediatric AML.
• These findings suggest a broader spectrum of clinical and genetic presentations for AML-M7 than previously documented.

Implications:

• The heterogeneity in chromosomal changes and age of presentation necessitates a re-evaluation of diagnostic and prognostic criteria for AML-M7.
• Potential ethnic differences in chromosomal alterations and age of presentation in Mexican children with AML warrant further investigation.
• This research highlights the importance of considering diverse genetic profiles and clinical characteristics in pediatric leukemia.