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Size, longevity and cancer: age structure.

Maarten J Wensink1

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Large, long-lived organisms are not paradoxically prone to cancer because they evolve cancer robustness. Increased cancer robustness benefits larger organisms more, driving the evolution of size and longevity.

Keywords:
Peto's paradoxcancerevolutionlongevitymulticellularity

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Area of Science:

  • Evolutionary biology
  • Cancer research
  • Theoretical biology

Background:

  • Peto's paradox highlights the unexpected lack of increased cancer risk in large, long-lived species.
  • This paradox is often explained by the inherent cancer robustness of such organisms, enabling their size and longevity.
  • Understanding cancer risk dynamics requires considering cancer incidence alongside competing risks over an organism's lifespan.

Purpose of the Study:

  • To investigate the age dynamics of cancer under a multistage carcinogenesis model, independent of competing risks.
  • To quantify the relationship between organism size, cellular cancer robustness, and cancer-free lifespan.
  • To explore the evolutionary implications of cancer robustness in the development of large, long-lived organisms.

Main Methods:

  • Utilized the multistage model of carcinogenesis to analyze cancer age dynamics.
  • Temporarily excluded competing risks to focus on the pure age-related cancer progression.
  • Analyzed the interaction between organism size and cellular cancer robustness on cancer-free lifespan.

Main Results:

  • Larger organisms gain more significant benefits in cancer-free lifespan from enhanced cellular cancer robustness compared to smaller organisms.
  • Increased cellular cancer robustness confers greater resilience to cancer-free lifespan against increases in organism size.
  • The interplay between size and cancer robustness is a key factor influencing the evolution of large, long-lived species.

Conclusions:

  • The evolution of large, long-lived organisms is intrinsically linked to their development of robust cancer-prevention mechanisms.
  • Cellular cancer robustness provides a selective advantage that scales with organism size, promoting longevity.
  • This study provides a theoretical framework for understanding the evolutionary pressures shaping cancer resistance in diverse species.