[Paper Review] A Historical Perspective on Cancer

Rafael D. Sorkin|arXiv (Cornell University)|Nov 1, 2000

Bioinformatics and Genomic Networks3 citations

TL;DR

This paper proposes that cancer arises not from genetic mutations per se, but from the evolutionary breakdown of universal control mechanisms that evolved to regulate growth and differentiation in multicellular organisms. By comparing genomes of unicellular and multicellular organisms, researchers can identify conserved genes responsible for these mechanisms, offering a novel strategy to restore them via gene therapy rather than destroying cancer cells.

ABSTRACT

It is proposed that cancer results from the breakdown of universal control mechanisms which developed in mutual association as part of the historical process that brought individual cells together into multi-cellular communities. By systematically comparing the genomes of uni-celled with multi-celled organisms, one might be able to identify the most promising sites for intervention aimed at restoring the damaged control mechanisms and thereby arresting the cancer.

Motivation & Objective

• To explain cancer as a deficiency disease caused by the loss of evolved control mechanisms for growth and differentiation in multicellular organisms.
• To argue that cancer is not caused by active pathogens or mutations, but by regression to a pre-social, unicellular state of uncontrolled proliferation.
• To propose that restoring missing or damaged regulatory machinery—rather than killing cancer cells—offers a more effective therapeutic strategy.
• To identify candidate genes for cancer intervention by comparing genomes of unicellular and multicellular organisms.
• To suggest that conserved, ancient genes shared across multicellular species are likely to encode the universal control mechanisms governing multicellularity.

Proposed method

• Compare the genomes of unicellular and multicellular organisms to identify genes universally present in the latter but absent in the former.
• Focus on the oldest such genes, assuming they are most likely to represent core components of the ancestral control mechanisms.
• Use retroviral vectors or similar agents to deliver functional replacement parts for defective control mechanisms in cancer cells.
• Prioritize genes that overlap in function between growth regulation and cellular differentiation, suggesting shared evolutionary origin.
• Assess the correlation between mutagenicity and carcinogenicity to validate the role of genetic components in the control mechanism failure.
• Use evolutionary conservation as a filter to distinguish essential regulatory machinery from random mutations.

Experimental results

Research questions

• RQ1 Why is uncontrolled growth in cancer consistently associated with loss of differentiation, despite their apparent biological independence?
• RQ2 What evolutionary mechanism could have led to the co-evolution of growth control and cellular differentiation in multicellular organisms?
• RQ3 How might the absence of a universal regulatory mechanism explain the pathological behavior of cancer cells?
• RQ4 Which genes or genomic sequences are universally present in multicellular organisms but absent in unicellular ones, and could they encode the missing control machinery?
• RQ5 Can the restoration of these conserved regulatory components reverse cancerous phenotypes without harming normal cells?

Key findings

• Cancer is not a disease caused by active pathogens or harmful mutations, but a deficiency disease resulting from the failure of evolved control mechanisms for multicellularity.
• The co-occurrence of uncontrolled growth and loss of differentiation in cancer is a historical consequence of the breakdown of a single, universal regulatory mechanism that evolved during the transition to multicellularity.
• Genes responsible for this control mechanism should be universally present in multicellular organisms and absent in unicellular ones, making them prime candidates for therapeutic intervention.
• The oldest such genes—those conserved across diverse multicellular lineages—are most likely to represent the core of the ancestral control system.
• The failure to identify such conserved genes would undermine the historical explanation of cancer proposed in this paper.
• The approach suggests a paradigm shift: from cytotoxic therapies to restoring missing regulatory machinery via gene therapy.