A core program of gene expression characterizes cancer metastases

Area of Science:

• Oncology
• Molecular Biology
• Genomics

Background:

• Metastasis gene expression enables cancer dissemination.
• The genetic basis for organ-specific metastasis remains unclear.

Purpose of the Study:

• Investigate common gene expression signatures in metastases across different sites.
• Determine if these signatures are conserved across cancer types and in a murine model.
• Explore potential therapeutic strategies based on metastatic genetic profiles.

Main Methods:

• Analyzed gene expression profiles from 653 GEO datasets.
• Corroborated findings using a murine metastasis model.
• Compared gene expression in primary tumors, metastases, and host tissues.

Main Results:

• Identified a core gene expression program in metastases affecting metabolism, vascularization, extracellular matrix, and ion homeostasis.
• This program distinguishes metastases from primary tumors and host tissues.
• Site-selectivity is achieved through specific gene expression adjustments to the target micro-environment.
• Similar gene expression programs were observed in B16-F10 cell metastases across various organs.

Conclusions:

• Metastases share common genetic features, but organ preference is modulated by site-specific factors.
• Investigate whether these genetic signatures determine organ preference or result from it.
• Therapeutic strategies targeting the genetic makeup of metastases may improve efficacy over targeting primary tumor origin.