Differences in mutational processes and intra-tumour heterogeneity between organs: The local selective filter...

Area of Science:

• Evolutionary biology
• Cancer research
• Organ microenvironments

Background:

• Tumor diversity (genetic, epigenetic, phenotypic) and hierarchical patterns across organs are not fully understood.
• Organs possess varying capacities for tumor suppression, acting as specialized ecosystems.

Purpose of the Study:

• To propose that the evolutionary ecology of organs explains tumor diversity and variation.
• To hypothesize that organ-specific selective pressures shape tumor evolution and heterogeneity.

Main Methods:

• Review and synthesis of existing hypotheses and data.
• Application of evolutionary ecology principles to cancer development.
• Comparative analysis of tumor characteristics across different organs.

Main Results:

• Organs with strong tumor suppression exert selective pressure, favoring hypermutator phenotypes and high intra-tumor heterogeneity (ITH).
• Organs with weaker suppression allow for less extreme tumor variability and lower ITH.
• Aggressive neoplasms with higher mutational and ITH levels emerge in organs with robust anti-cancer defenses.

Conclusions:

• Organ defenses significantly impact tumor evolution and heterogeneity.
• The evolutionary ecology of organs provides a framework for understanding cancer diversity.
• Understanding these dynamics can inform cancer treatment strategies.