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DNA repair and immune checkpoint blockade response

Jimmy A Guo1, Mohammed Alshalalfa2, Daniel Y Kim3

  • 1Broad Institute of MIT and Harvard, Cambridge, MA, USA.

Cancer Genetics
|March 4, 2022
PubMed

Insights

Mutations in specific DNA repair genes are linked to better outcomes for patients receiving immune checkpoint blockade (ICB) cancer therapy. These DNA repair gene mutations may serve as biomarkers to identify patients likely to respond to ICB treatment.

Area of Science:

  • Oncology
  • Genetics
  • Immunotherapy

Background:

  • Immune checkpoint blockade (ICB) therapy offers significant promise for cancer treatment.
  • Identifying patients likely to respond to ICB is crucial for treatment efficacy.
  • Tumor mutational status is increasingly recognized as a factor influencing treatment response.

Purpose of the Study:

  • To investigate the association between mutations in core DNA repair genes and ICB treatment outcomes.
  • To identify potential DNA repair gene mutation biomarkers for predicting ICB response across diverse cancer types.

Main Methods:

  • Analysis of mutations in 25 core DNA repair genes in 6619 advanced cancer patients.
  • Utilized MSK-IMPACT tumor sequencing data for comprehensive genomic profiling.
  • Correlated DNA repair gene mutations with overall survival in patients receiving ICB.

Main Results:

  • Mutations in 7 DNA repair genes (ATM, ATR, POLE, ERCC4, NBN, RAD50, PARP1) were significantly associated with improved overall survival in ICB-treated patients.
  • A significant interaction between DNA repair gene mutations and ICB treatment was observed.
  • Enrichment of DNA repair mutations was noted in various cancer types, suggesting potential as a universal biomarker.

Conclusions:

  • Mutations in specific DNA repair genes can serve as predictive biomarkers for ICB therapy response.
  • These findings support the development of genomic biomarkers to personalize cancer immunotherapy.
  • Further validation across diverse cohorts is warranted to establish clinical utility.
Keywords:
BiomarkersDNA repairImmune checkpoint blockadeImmunotherapySurvival outcomes

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