Somatic Mutations in DNA Mismatch Repair Genes, Mutation Rate and Neoantigen Load in Acute Lymphoblastic Leukemia

Area of Science:

• Oncology
• Immunology
• Genetics

Background:

• Tumor cells acquire somatic mutations, potentially creating tumor-specific neoantigens recognized by the immune system.
• Pediatric cancers, like acute lymphoblastic leukemia (ALL), generally have fewer mutations and neoantigens compared to adult tumors.
• Understanding the neoantigen landscape in pediatric ALL is crucial for developing novel immunotherapy strategies.

Purpose of the Study:

• To identify potential neoantigens in pediatric acute lymphoblastic leukemia (ALL) patients.
• To investigate the relationship between tumor mutational burden (TMB), neoantigen load, and clinical outcomes in pediatric ALL.

Main Methods:

• Whole-exome sequencing of matched tumor-normal samples from pediatric ALL cases.
• Prediction of HLA-I alleles and identification of somatic mutations.
• Proposal of potential neoantigens based on mutated peptide-HLA-I binding affinity.

Main Results:

• A significant correlation was observed between tumor mutational burden (TMB) and neoantigen load (p < 0.001).
• TMB and neoantigen levels were higher in ALL patients with mutated DNA mismatch repair genes (p < 0.001).
• No significant correlation was found between TMB/neoantigen load and patient prognosis.

Conclusions:

• The identification of neoantigens in pediatric ALL supports neoantigen-based immunotherapy as a viable treatment strategy.
• This approach shows particular promise for treating pediatric ALL patients experiencing relapse.
• Further research into neoantigen landscapes can advance personalized cancer treatments.