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Comprehensive Molecular Characterization Identifies Distinct Genomic and Immune Hallmarks of Renal Medullary
Pavlos Msaouel1, Gabriel G Malouf2, Xiaoping Su3
1Department of Genitourinary Medical Oncology, Unit 1374, The University of Texas MD Anderson Cancer Center, 1155 Pressler Street, Houston, TX 77030-3721, USA; Center for Precision Environmental Health, Baylor College of Medicine, Houston, Texas, USA.
Abstract:
Renal medullary carcinoma (RMC) is a highly lethal malignancy that mainly afflicts young individuals of African descent and is resistant to all targeted agents used to treat other renal cell carcinomas. Comprehensive genomic and transcriptomic profiling of untreated primary RMC tissues was performed to elucidate the molecular landscape of these tumors. We found that RMC was characterized by high replication stress and an abundance of focal copy-number alterations associated with activation of the stimulator of the cyclic GMP-AMP synthase interferon genes (cGAS-STING) innate immune pathway. Replication stress conferred a therapeutic vulnerability to drugs targeting DNA-damage repair pathways. Elucidation of these previously unknown RMC hallmarks paves the way to new clinical trials for this rare but highly lethal malignancy.
Insights
Renal medullary carcinoma (RMC) is a rare, aggressive cancer. New research reveals RMC tumors have high replication stress, offering a potential therapeutic vulnerability for targeted DNA-damage repair drugs.
Area of Science:
- Oncology
- Genetics
- Immunology
Background:
- Renal medullary carcinoma (RMC) is a highly lethal kidney cancer, primarily affecting young Black individuals.
- RMC is notably resistant to treatments effective against other renal cell carcinomas.
- The underlying molecular mechanisms driving RMC remain largely uncharacterized.
Purpose of the Study:
- To comprehensively profile the genomic and transcriptomic landscape of untreated primary RMC.
- To identify key molecular features and potential therapeutic vulnerabilities in RMC.
Main Methods:
- Whole-genome and whole-transcriptome sequencing of primary RMC tumor tissues.
- Analysis of copy-number alterations and gene expression patterns.
- Investigation of innate immune pathway activation, specifically the cGAS-STING pathway.
Main Results:
- RMC tumors exhibit significantly high levels of replication stress.
- Frequent focal copy-number alterations were observed, linked to the activation of the cGAS-STING innate immune pathway.
- Replication stress was identified as a critical vulnerability in RMC.
Conclusions:
- The study elucidates previously unrecognized molecular hallmarks of RMC, including replication stress and cGAS-STING pathway activation.
- These findings suggest that targeting DNA-damage repair pathways represents a promising therapeutic strategy for RMC.
- The identified RMC characteristics provide a foundation for developing novel clinical trials for this aggressive malignancy.
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