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Updated: Jun 21, 2025
The Use of Reverse Phase Protein Arrays RPPA to Explore Protein Expression Variation within Individual Renal Cell Cancers
Published on: January 22, 2013
Molecular analysis of primary and metastatic sites in patients with renal cell carcinoma
Shuchi Gulati1, Pedro C Barata2, Andrew Elliott3
1UC Davis Comprehensive Cancer Center, Sacramento, California, USA.
Abstract:
BACKGROUNDMetastases are the hallmark of lethal cancer, though underlying mechanisms that drive metastatic spread to specific organs remain poorly understood. Renal cell carcinoma (RCC) is known to have distinct sites of metastases, with lung, bone, liver, and lymph nodes being more common than brain, gastrointestinal tract, and endocrine glands. Previous studies have shown varying clinical behavior and prognosis associated with the site of metastatic spread; however, little is known about the molecular underpinnings that contribute to the differential outcomes observed by the site of metastasis.METHODSWe analyzed primary renal tumors and tumors derived from metastatic sites to comprehensively characterize genomic and transcriptomic features of tumor cells as well as to evaluate the tumor microenvironment at both sites.RESULTSWe included a total of 657 tumor samples (340 from the primary site [kidney] and 317 from various sites of metastasis). We show distinct genomic alterations, transcriptomic signatures, and immune and stromal tumor microenvironments across metastatic sites in a large cohort of patients with RCC.CONCLUSIONWe demonstrate significant heterogeneity among primary tumors and metastatic sites and elucidate the complex interplay between tumor cells and the extrinsic tumor microenvironment that is vital for developing effective anticancer therapies.
Insights
Metastatic cancer spread to specific organs is poorly understood. This study reveals distinct genomic, transcriptomic, and microenvironment differences across renal cell carcinoma (RCC) metastatic sites, impacting treatment strategies.
Area of Science:
- Oncology
- Cancer Biology
- Genomics
Background:
- Metastases are key to lethal cancers, but mechanisms driving organ-specific spread are unclear.
- Renal cell carcinoma (RCC) exhibits varied metastatic sites, influencing clinical outcomes.
- Molecular drivers of differential outcomes based on metastasis site are largely unknown.
Purpose of the Study:
- To comprehensively characterize genomic and transcriptomic features of primary and metastatic RCC tumors.
- To evaluate the tumor microenvironment at primary and metastatic sites.
- To understand molecular underpinnings of differential outcomes in RCC metastasis.
Main Methods:
- Analysis of 657 tumor samples: 340 primary kidney tumors and 317 metastatic tumors.
- Comprehensive characterization of genomic alterations and transcriptomic signatures.
- Evaluation of immune and stromal tumor microenvironments.
Main Results:
- Distinct genomic alterations identified across different metastatic sites in RCC.
- Unique transcriptomic signatures observed correlating with metastatic site.
- Significant differences in immune and stromal tumor microenvironments were found based on metastasis location.
Conclusions:
- Demonstrated significant heterogeneity between primary RCC tumors and their metastases.
- Elucidated the complex interplay between tumor cells and the tumor microenvironment.
- Findings are vital for developing targeted anticancer therapies for RCC metastasis.
