Challenges in bioinformatics approaches to tumor mutation burden analysis

Area of Science:

• Oncology
• Genomics
• Immunotherapy

Background:

• Immune checkpoint inhibitors (ICIs) are revolutionizing cancer treatment.
• Identifying reliable biomarkers for ICI response, such as tumor mutation burden (TMB), is critical.
• Current TMB assessment methods lack standardization, hindering clinical utility.

Purpose of the Study:

• To evaluate targeted next-generation sequencing panels for TMB assessment.
• To investigate the correlation between TMB and microsatellite instability.
• To highlight challenges in standardizing bioinformatics pipelines for TMB analysis.

Main Methods:

• Analysis of cultured and formalin-fixed, paraffin-embedded cell lines using a commercial TMB testing panel.
• Comparison of results with literature and public databases.
• Utilizing two distinct bioinformatics pipelines for data analysis.

Main Results:

• Demonstrated good correlation between targeted panel results and existing data.
• Confirmed the association between high tumor mutation burden and microsatellite instability.
• Highlighted variability and challenges in TMB estimation due to different bioinformatics workflows.

Conclusions:

• Targeted sequencing panels offer a viable approach for TMB assessment.
• Standardization of bioinformatics pipelines is essential for reproducible TMB testing in clinical practice.
• Further research is needed to establish standardized protocols for TMB biomarker evaluation.