Objective:
To evaluate the effectiveness of ataxia telangiectasia–mutated immunohistochemistry (ATM IHC) in identifying endometrial carcinomas with polymerase-epsilon (POLE) variants, which are significant for patient prognosis and treatment.
Approach:
- ATM IHC achieved 97% specificity and 80% accuracy for detecting POLE variants, indicating its potential as a reliable screening tool.
- 96% of POLE variant cases exhibited nondiffuse ATM staining patterns, suggesting a distinct biomarker profile.
- Tumors with POLE variants had a median of 158.6 mutations per Mb, indicating a higher tumor mutational burden (TMB) that may influence treatment decisions.
- ATM alterations were found in 82% of POLE-mutated endometrial cancers, with truncating variants correlating with loss of ATM protein expression, highlighting a potential therapeutic target.
- Single-center design may limit generalizability, suggesting the need for multi-center studies.
- Modest sample size may affect the robustness of the findings.
- Inclusion of only endometrioid histology limits applicability to other endometrial cancer types.
Key Findings:
Interpretation:
ATM IHC is a promising screening tool for identifying patients with POLE variants, particularly in those without mismatch repair deficiency or p53 abnormalities, which could guide personalized treatment strategies.
Limitations:
Conclusion:
ATM IHC provides a cost-effective method to identify patients who may benefit from further molecular testing, underscoring the need for additional research to validate these findings.
Sources:
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